| AgencyCode | AgencyName | AgencyDescr | PrimaryContact | City | email | LastUpdateDate | | 2NDNATURE | 2NDNATURE, LLC | | Krista McDonald | Santa Cruz | krista@2ndnaturellc.com | 2017-10-13 |
| 4MARBLES | 4Marbles, Inc. | 4Marbles, Inc. | Lee Tremblay | | eetremblay@4marbles.org | 2013-10-01 |
| ABL | A & B Laboratories | A & B Laboratories | | | | 2017-06-05 |
| ALWAL | A & L Western Agricultural Laboratories, Inc. | A & L Western Agricultural Laboratories, Inc. | | Modesto | | 2012-08-30 |
| A1ANAL | A-1 Analytical Labs, Salinas | A-1 Analytical Labs, Salinas | | | | 2017-06-05 |
| CIWQS 553 | AAF-McQuay, Inc | | | | | 1900-01-01 |
| ABALONE | Abalone Coast Analytical | Abalone Coast Analytical | Amanda Smith | San Luis Obispo | amanda.smith@abalonecoastanalytical.com | 2015-12-21 |
| ACCULAB | Acculab Environmental Services | Acculab Environmental Services | | | | 2017-06-05 |
| Acterra | Acterra | Acterra | | Palo Alto | | 2015-10-05 |
| ACUREX | Acurex Analytical Chemistry Lab | Acurex Analytical Chemistry Lab | | | | 2017-06-05 |
| ADH | ADH Environmental | ADH Environmental | Christian Kocher | Soquel | ckocher@adhenvironmental.com | 2012-08-30 |
| ATL | Advanced Technology Laboratories | Advanced Technology Laboratories | | Signal Hill | | 2017-02-13 |
| AD_SCI | Adventure Scientists | Adventure Scientists | | | | 2017-05-01 |
| AECOM | AECOM | AECOM | Amy Gardner | San Diego | Amy.Gardner@aecom.com | 2012-12-07 |
| AECOM-Oakland | AECOM Oakland Office | AECOM Oakland Office | | Oakland | | 2023-05-22 |
| AECOM-Sacramento | AECOM Sacramento Office | AECOM Sacramento Office | Steve Pagliughi | Sacramento | Steve.Pagliughi@aecom.com | 2018-01-31 |
| CIWQS 854 | Aerojet General Corp | | | | | 1900-01-01 |
| AEROJET | Aerojet TechSystems | Aerojet TechSystems | | | | 2017-06-05 |
| Not Recorded | Agency Not Recorded | Agency Not Recorded | | | | 2007-09-01 |
| AHC | Agoura Hills City | Agoura Hills City | | | | 2018-09-22 |
| AGTECH | Agricultural Technology Services Lab | Agricultural Technology Services Lab | | | | 2017-06-05 |
| APPL | Agriculture & Priority Pollutants Laboratories, Inc | Agriculture & Priority Pollutants Laboratories, Inc | | Fresno | | 2007-09-01 |
| ALBL | Air Liquide Balazs Laboratories | Air Liquide Balazs Laboratories | | | | 2017-06-05 |
| AlamedaCounty | Alameda County | Alameda County | | | | 2017-06-08 |
| ACFCWCD | Alameda County Flood Control & Water Conservation District | Alameda County Flood Control & Water Conservation District | | | | 2014-08-04 |
| ACPWA | Alameda County Public Works Agency | Alameda County Public Works Agency | | | | 2014-08-04 |
| ACWD | Alameda County Water District | Alameda County Water District | | | | 2017-06-28 |
| ACCWP | Alameda Countywide Clean Water Program | Alameda Countywide Clean Water Program | Arleen Feng | Hayward | arleen@acpwa.org | 2016-03-24 |
| Albany | Albany City Dept Public Works | Albany City Dept Public Works | Ray Chan | Albany | rchan@albanyca.org | 2016-06-15 |
| Algalita | Algalita | Algalita | | | | 2008-01-01 |
| AWMA | Aliso Water Management Authority | Aliso Water Management Authority | Ann Harley | Dana Point | | 2012-05-07 |
| ALPHA_San Diego | Alpha Analytical Laboratories Inc., San Diego | Alpha Analytical Laboratories Inc., San Diego | | Carlsbad | | 2024-01-23 |
| ALPHA_Ukiah | Alpha Analytical Laboratories Inc., Ukiah | Alpha Analytical Laboratories Inc., Ukiah | | Ukiah | clientservices@alpha-labs.com | 2016-07-05 |
| ALPHA | Alpha Analytical, Inc. | Alpha Analytical, Inc. | | Sparks | | 2007-09-01 |
| AWG | Alpine Watershed Group | Community Based Non-Profit Organization serving Alpine County's watershed coordination needs including relevant water quality monitoring. | AWG | Woodfords | alpinewatershed@gmail.com | 2017-03-30 |
| ALS | ALS Laboratory Group | ALS Laboratory Group | | Salt Lake City | | 2013-10-28 |
| ALTA | Alta Environmental | Alta Environmental | Kathy Hubbard | Long Beach | kathy.hubbard@altaenviron.com | 2013-08-06 |
| CIWQS 1406 | Alturas City | | | | | 1900-01-01 |
| AmadorCounty | Amador County | Amador County | | | | 2017-06-08 |
| AMEC | AMEC Environment & Infrastructure | AMEC Environment & Infrastructure | Tyler Huff | San Diego | tyler.huff@amec.com | 2011-08-08 |
| AMERANAL | American Analytical Lab | American Analytical Lab (formerly known as A-1 Analytical Labs) | | | | 2017-06-05 |
| CIWQS 1520 | AMERICAN CANYON CITY | | | | | 1900-01-01 |
| AEMC | American Environmental Management Corporation | American Environmental Management Corporation | | | | 2017-06-05 |
| AETL | American Environmental Testing Laboratories | American Environmental Testing Laboratories | | | | 2017-08-29 |
| AETL_RC | American Environmental Testing Laboratory, Inc., Rancho Cordova | American Environmental Testing Laboratory, Inc., Rancho Cordova | | Rancho Cordova | | 2019-06-03 |
| ARC | American River Conservancy | American River Conservancy | | Lotus | | 2010-10-19 |
| AR | American Rivers | American Rivers | Maiya Greenwood | Nevada City | mgreenwood@americanrivers.org | 2017-04-25 |
| AMERWW | American Water Works, Bellville | American Water Works, Bellville | | | | 2017-06-05 |
| CIWQS 3211 | Ameripride Services Inc | | | | | 1900-01-01 |
| AMTECH | Amtech Laboratories | Amtech Laboratories | | | | 2017-06-05 |
| ANACON | ANACON, Inc. | AnaCon Laboratories, Inc | James Lee | Houston | | 2012-08-30 |
| ACWDL | Anaheim City Water Quality Laboratory | Anaheim City Water Quality Laboratory | | | | 2017-06-05 |
| ANARES | Analytical Resources, Inc. | Analytical Resources, Inc. | | Tukwila | | 2015-03-24 |
| AS | Analytical Sciences, LLC | Analytical Sciences, LLC | | Petaluma | | 2014-04-21 |
| ANALTECH | Analytical Technologies, Inc. Lab | Analytical Technologies, Inc. Lab | | | | 2017-06-05 |
| ANAMETRIX | Anametrix | Anametrix | | | | 2017-06-05 |
| ANATEC | Anatec Labs, Inc. | Anatec Labs, Inc. | | | | 2017-06-05 |
| AnchorQEA | Anchor QEA | Anchor QEA | Andrew Martin or Ivy Fuller | Seattle | amartin@anchorqea.com | 2015-11-16 |
| CIWQS 1728 | Anderson City | | | | | 1900-01-01 |
| CIWQS 1797 | Angels City | | | | | 1900-01-01 |
| ADSL | Anlab-Dewante and Stowell Lab | Anlab-Dewante and Stowell Lab | | | | 2017-06-05 |
| AVEK | Antelope Valley - East Kern Water Agency | Antelope Valley - East Kern Water Agency | | | | 2017-06-05 |
| AWTP | Antioch Water Treatment Plant | Antioch Water Treatment Plant | | | | 2017-06-05 |
| AMS-CA | Applied Marine Sciences, Inc. California | Applied Marine Sciences, Inc. California | Paul Salop | Livermore | salop@amarine.com | 2007-12-21 |
| AMSLabs | Applied Microbiological Services | Applied Microbiological Services | Versha Patel | Long Beach | versha@amslabs.com | 2016-08-19 |
| APCL | Applied P & Ch Laboratories, Inc. | Applied P & Ch Laboratories, Inc. | Unknown | Chino | | 2012-05-07 |
| AREL | Applied Remediation Environmental Lab | Applied Remediation Environmental Lab | | | | 2017-06-05 |
| AQUALAB | AquaLab | AquaLab | | | | 2017-06-05 |
| AquaSci | AquaScience | AquaScience | Mike Miller | Davis | Aquasci@aol.com | 2007-09-01 |
| AA | Aquatic Analysts | Aquatic Analysts | Jim Sweet | Friday Harbor | | 2018-03-05 |
| ABCL | Aquatic Bioassay and Consulting Laboratories, Inc. | Aquatic Bioassay and Consulting Laboratories, Inc. | Michael Machuzak | Ventura | aquabio@pacbell.net | 2011-10-12 |
| ABL_Chico | Aquatic Bioassessment Lab - Chico | Aquatic Bioassessment Lab - Chico | Shawn McBride | | Shawn.McBride@wildlife.ca.gov | 2019-09-23 |
| DFW-ABL | Aquatic Bioassessment Lab - DFW | Aquatic Bioassessment Lab - DFW | | | | 2007-09-01 |
| ABA | Aquatic Biology Associates, Inc. | Aquatic Biology Associates, Inc. | Robert Wisseman | Corvalis | AQUATICBIO@MAC.COM | 2011-11-02 |
| AET | Aquatic EcoTechnologies, LLC | Aquatic EcoTechnologies, LLC | Alle Lie | Santa Cruz | alle@aquaticecotechnologies.com | 2020-09-23 |
| ARI | Aquatic Research, Inc. | Aquatic Research, Inc. | | Seattle | info@aquaticresearchinc.com | 2014-10-06 |
| DFW-ATL | Aquatic Toxicology Laboratory | Aquatic Toxicology Laboratory | Brian Finlayson | Elk Grove | Friley@ospr.dfg.ca.gov | 2007-09-01 |
| CIWQS 1988 | Arcata City | | | | | 1900-01-01 |
| ACWL | Arcata City Water Laboratory | Arcata City Water Laboratory | | | | 2017-06-28 |
| ALA | Arrowhead Lake Association | Organization responsible for administering boat registration and dock fees, plus maintenance of Lake Arrowhead and related properties | | | | 2023-07-12 |
| ARROWHEAD | Arrowhead Puritas | Arrowhead Puritas | | | | 2017-06-05 |
| AGCity | Arroyo Grande City | Arroyo Grande City Public Works Dept | Geoff English | Arroyo Grande | | 2016-01-04 |
| ASBESTOSTEM | Asbestos TEM Laboratories, Inc. | Asbestos TEM Laboratories, Inc. | | | | 2017-06-05 |
| AssocLabs | Associated Laboratories | Associated Laboratories | | Orange | | 2013-10-01 |
| AL | Assoicated Laboratories | Assoicated Laboratories | Unknown | Orange | | 2012-05-07 |
| AEHL | Atkins Environmental Help Labs | Atkins Environmental Help Labs | | | | 2017-06-05 |
| CIWQS 2372 | Atwater City | | | | | 1900-01-01 |
| CIWQS 2383 | Auburn City | | | | | 1900-01-01 |
| CIWQS 3672 | Avalon City | | | | | 1900-01-01 |
| CIWQS 2475 | Avila Beach CSD | | | | | 1900-01-01 |
| AXYS | AXYS Analytical Services Ltd. | AXYS Analytical Services Ltd. | Pamela Riley | Sidney | priley@axys.com | 2011-06-09 |
| BBL | B and B Laboratories, Inc. | B and B Laboratories, Inc. (TDI Brooks International) | Juan Ramirez | College Station | juanramirez@tdi-bi.com | 2011-08-04 |
| Babcock | Babcock Laboratories | E.S. Babcock & Sons, Inc. (also known as Babcock Laboratories), Riverside Headquarters | Jim Reid | Riverside | lchrystal@babcocklabs.com | 2007-09-01 |
| Babcock_ElCentro | Babcock Laboratories, El Centro | E.S. Babcock & Sons, Inc. (also known as Babcock Laboratories), El Centro Office | | | | 2021-10-19 |
| Bachand | Bachand & Associates | Bachand & Associates | Philip Bachand | Davis | philip@bachandassociates.com | 2020-03-30 |
| CIWQS 40631 | BAE Systems San Diego Ship Repair Inc | | | | | 1900-01-01 |
| Balance | Balance Hydrologics, Inc. | Balance Hydrologics, Inc. | Chris White | Berkeley | cwhite@balancehydro.com | 2012-11-23 |
| BARRINGER | Barringer Laboratories, Inc. | Barringer Laboratories, Inc. | | | | 2017-06-05 |
| BAL | Basic Laboratory, Inc. | Basic Laboratory, Inc. | Matt Rose | Redding | mrose@basiclabinc.com | 2007-09-01 |
| BASMAA_RMC | BASMAA Regional Monitoring Coalition | Bay Area Stormwater Management Agencies Association Regional Monitoring Coalition | | | | 2012-11-15 |
| Battelle-MA | Battelle Marine Sciences Laboratory - MA | Battelle Marine Sciences Laboratory - MA | | Duxbury | | 2007-12-21 |
| Battelle-WA | Battelle Marine Sciences Laboratory - WA | Battelle Marine Sciences Laboratory - WA | Brenda Lasorsa | Sequim | Brenda.lasorsa@pnl.gov | 2007-12-21 |
| BCA | Battle Creek Alliance | Battle Creek Alliance | Marily Woodhouse | Manton | battlecreekalliance@gmail.com | 2019-01-08 |
| BCWC | Battle Creek Watershed Conservancy | Battle Creek Watershed Conservancy | | Manton | sptussing@earthlink.net | 2014-08-10 |
| BACWA | Bay Area Clean Water Agencies | Bay Area Clean Water Agencies | | | | 2017-06-05 |
| BADA | Bay Area Dischargers' Association - Local Effects Monitoring | Bay Area Dischargers' Association - Local Effects Monitoring | | | | 2007-12-21 |
| BAMSC_RMC | Bay Area Municipal Stormwater Collaborative Regional Monitoring Coalition | Bay Area Municipal Stormwater Collaborative Regional Monitoring Coalition | | | | 2024-10-03 |
| BART | Bay Area Rapid Transit District | Bay Area Rapid Transit District | | | | 2019-01-07 |
| BCL | BC Laboratories, Inc. | BC Laboratories, Inc. | Aileen Cantorna | Bakersfield | bclabs@bclabs.com | 2007-09-01 |
| CIWQS 4251 | Bear Valley CMSD | | | | | 1900-01-01 |
| CIWQS 4256 | Bear Valley Water District (Bear Valley, CA) | | | | | 1900-01-01 |
| CIWQS 445907 | Beaumont City | | | | | 1900-01-01 |
| CIWQS 4343 | Bell Carter Olive Company Inc | | | | | 1900-01-01 |
| CIWQS 4357 | Bella Vista Water District | | | | | 1900-01-01 |
| BendGX | Bend Genetics LLC | Bend Genetics LLC | Tim Otten | Sacramento | | 2017-12-05 |
| CIWQS 4406 | Benicia City | City of Benicia | | | srovanpera@ci.benicia.ca.us | 2018-01-30 |
| BCWTPL | Benicia City Wastewater Treatment Plant Laboratory, Lake Herman | Benicia City Wastewater Treatment Plant Laboratory, Lake Herman | | | | 2017-06-05 |
| CIWQS 4484 | Berry Petroleum Company | | | | | 1900-01-01 |
| BBMWD | Big Bear Municipal Water District | Big Bear Municipal Water District | | | | 2020-10-29 |
| BVB_Pomo | Big Valley Band of Pomo Indians | Tribal government EPA Department | Sarah Ryan | Lakeport | sryan@big-valley.net | 2018-02-21 |
| BAS | BioAssessment Services | BioAssessment Services | Tom King | Folsom | jtkbioassess@gmail.com | 2012-08-30 |
| BTRL | Biological Testing & Research Laboratory | Biological Testing & Research Laboratory | | | | 2017-06-05 |
| BiovirLab | Biovir Laboratories | Biovir Laboratories | | | | 2011-06-14 |
| BOLSA | Bolsa Analytical Laboratory | Bolsa Analytical Laboratory | | | | 2017-06-05 |
| BRANCIFORTE | Branciforte Laboratories, Watsonville | Branciforte Laboratories, Watsonville | | | | 2017-06-05 |
| BSKL | Braun, Skaggs and Kevorkian Lab | Braun, Skaggs and Kevorkian Lab | | | | 2017-06-05 |
| CIWQS 5169 | Brawley City | | | | | 1900-01-01 |
| BRL | Brelje and Race Laboratories, Inc. | Brelje and Race Laboratories, Inc. | Ann Hill | Santa Rosa | | 2007-09-01 |
| CIWQS 148431 | Brentwood City | | | | | 1900-01-01 |
| BA | Brooks Applied Labs | Brooks Applied Labs (formerly known as Brooks Rand Labs) | Tiffany Stillwater | Bothell | Tiffany@brooksapplied.com | 2016-06-23 |
| BR | Brooks Rand Labs | Brooks Rand Labs | Elizabeth Madonick | Seattle | elizabeth@brooksrand.com | 2007-12-21 |
| BRWNCALD | Brown and Caldwell | | Eileen Wiegele | San Diego | ewiegele@brwncald.com | 2014-09-04 |
| BrCaL-Emeryville | Brown and Caldwell Lab, Emeryville | Brown and Caldwell Lab, Emeryville | | | | 2017-06-05 |
| BrCaL-Pasadena | Brown and Caldwell Lab, Pasadena | Brown and Caldwell Lab, Pasadena | | | | 2017-06-05 |
| BrCaL | Brown and Caldwell Laboratories | Brown and Caldwell Laboratories | Michael Flake, P.E. | Walnut Creek | | 2014-07-09 |
| BBWTPL | Bryte Bend Water Treatment Plant Laboratory | Bryte Bend Water Treatment Plant Laboratory | | | | 2017-06-28 |
| BSA_Env | BSA Environmental Servises, Inc. | BSA Environmental Servises, Inc. | | Beachwood | | 2024-04-03 |
| BSK | BSK Analytical Laboratory | BSK Analytical Laboratory | Brenda Lasorsa | Sequim | Brenda.lasorsa@pnl.gov | 2007-09-01 |
| BSK-Fresno | BSK Associates Fresno | BSK Associates Fresno | Belinda Vega | | bvega@bskassociates.com | 2023-10-31 |
| BSK-RanchoCordova | BSK Associates Rancho Cordova | BSK Associates Rancho Cordova | Brenda Hamilton | | bhamilton@bskassociates.com | 2023-10-31 |
| BVC | Buena Vista Coalition | Buena Vista Coalition | Tim Ashlock | Buttonwillow | tim@bvh2o.com | 2013-09-12 |
| BVWSD | Buena Vista Water Storage District | Buena Vista Water Storage District | Dan Bartel | Buttonwillow | | 2008-01-01 |
| CIWQS 6656 | Burbank City DPW | | | | | 1900-01-01 |
| BLM | Bureau of Land Management | Bureau of Land Management | Andy Hamilton | Klamath Falls | andy_hamilton@blm.gov | 2012-04-20 |
| BCWTP | Burlingame City Wastewater Treatment Plant | Burlingame City Wastewater Treatment Plant | | | | 2017-06-05 |
| CIWQS 5597 | Burney Forest PWR/Shasta Green | | | | | 1900-01-01 |
| ButteCounty | Butte County | Butte County | | | | 2017-06-08 |
| CLTECH | C.L. Technology, Inc. | C.L. Technology, Inc. | | | | 2017-06-05 |
| CDSH-Napa | CA Department of State Hospitals-Napa | CA Department of State Hospitals-Napa | | | | 2022-09-09 |
| DWR-MWQI | CA Department of Water Resources - Municipal Water Quality Investigations | CA Department of Water Resources - Municipal Water Quality Investigations | | West Sacramento | | 2015-09-21 |
| CIWQS 6913 | CA Dept of Corrections | | | | | 1900-01-01 |
| CIWQS 6912 | CA Dept of Corrections Imperial | | | | | 1900-01-01 |
| CIWQS 6904 | Ca Dept of Corrections San Luis Obispo | | | | | 1900-01-01 |
| CIWQS 6896 | CA Dept of Fish & Game Fresno | | | | | 1900-01-01 |
| CIWQS 6940 | Ca Dept of Fish & Game Independence | | | | | 1900-01-01 |
| CIWQS 6930 | Ca Dept of Fish & Game Nimbus | | | | | 1900-01-01 |
| CIWQS 6934 | Ca Dept of Fish & Wildlife Hornbrook | | | | | 1900-01-01 |
| CIWQS 6927 | Ca Dept of Fish & Wildlife Redding | | | | | 1900-01-01 |
| CDFA_Berkeley | CA Dept of Food and Agriculture Lab, Berkeley | California Dept of Food and Agriculture Lab, Berkeley | | | | 2017-06-05 |
| CDHS_Berkeley | CA Dept of Health Services Lab, Berkeley | California Dept of Health Services Lab, Berkeley | | | | 2017-06-05 |
| CDHS_LosAngeles | CA Dept of Health Services Lab, Los Angeles | California Dept of Health Services Lab, Los Angeles | | | | 2017-06-05 |
| CIWQS 6995 | Ca Dept of Parks & Rec Sacramento Headquaters | | | | | 1900-01-01 |
| CIWQS 7123 | Ca Dept of Parks & Rec Tahoma | | | | | 1900-01-01 |
| CALTRANSD1 | CA Dept of Transportation District 1, Eureka | California Dept of Transportation District 1, Eureka | | | | 2017-06-05 |
| CALTRANSD2 | CA Dept of Transportation District 2, Redding | California Dept of Transportation District 2, Redding | | | | 2017-06-05 |
| CIWQS 7046 | Ca Dept of Water Resources Pearblossom | | | | | 1900-01-01 |
| CASG-MLML | CA Sea Grant at Moss Landing Marine Laboratories | CA Sea Grant at Moss Landing Marine Laboratories | Rick Starr | Moss Landing | starr@mlml.calstate.edu | 2009-09-22 |
| CASG-RRSSMP | CA Sea Grant Russian River Salmon and Steelhead Monitoring Program | CA Sea Grant Russian River Salmon and Steelhead Monitoring Program | | | | 2019-11-26 |
| CSUSD-WIRL_SWL | CA State University San Diego - Water Innovation Research Laboratory (WIRL) & Safe WaTER Research Lab (SWL) | CA State University San Diego - Water Innovation Research Laboratory (WIRL) & Safe WaTER Research Lab (SWL); PI: Natalie Mladenov; co-PIs: Matthew Verbyla, Alicia Kinoshita, Rick Gersberg | Natalie Mladenov | San Diego | nmladenov@sdsu.edu | 2020-10-29 |
| CUBA_TST | CA Urban Streams Alliance-The Stream Team | CA Urban Streams Alliance-The Stream Team | | | | 2018-03-12 |
| CIWQS 7164 | Cabrillo Power I LLC | | | | | 1900-01-01 |
| Cabrillo | Cabrillo Power I, LLC | Cabrillo Power I, LLC | | | | 2021-03-03 |
| CalabasasCity | Calabasas City | Calabasas City | | | | 2018-09-22 |
| CIWQS 7274 | Calaveras Cnty Water District | | | | | 1900-01-01 |
| CIWQS 7281 | Calaveras Trout Farm, Inc | | | | | 1900-01-01 |
| CIWQS 8661 | Calexico City | | | | | 1900-01-01 |
| CAD_TWG | California Algae and Diatom Taxonomic Working Group | Organization having authority over the taxonomy of freshwater soft algae (including cyanobacteria) and diatoms | Lilian Busse | San Diego | http://www.cad-twg.org/ | 2012-01-17 |
| CAWC | California American Water Company | California American Water Company | | | | 2017-06-05 |
| CAWC-Monterey | California American Water Company Lab, Monterey | California American Water Company Lab, Monterey | | | | 2017-06-05 |
| CALANAL | California Analytical Lab | California Analytical Lab (formerly Cal-Enseco) | | | | 2017-06-05 |
| CCC | California Coastal Commission | California Coastal Commission | | | | 2017-05-01 |
| CDFA | California Department of Food and Agriculture, Center for Analytical Chemistry | California Department of Food and Agriculture, Center for Analytical Chemistry | Stephen Siegel | Sacramento | ssiegel@cdfa.ca.gov | 2008-01-01 |
| CADeptParksGFD | California Department of Parks and Recreation - Gold Fields District | California Department of Parks and Recreation - Gold Fields District | | Folsom | | 2022-05-23 |
| DPR | California Department of Pesticide Regulation | California Department of Pesticide Regulation | | Sacramento | | 2015-06-24 |
| CDPH | California Department of Public Health | Environmental Management Branch | | Richmond | | 2015-03-30 |
| Caltrans | California Department of Transportation | California Department of Transportation | Bhaskar Joshi | | | 2015-04-23 |
| DWR-ND | California Department of Water Resources, Northern District | California Department of Water Resources, Northern District | Ryan Martin | Red Bluff | | 2007-09-01 |
| CLS | California Laboratories Services | California Laboratories Services | Raymond Oslowski, Jr. | Rancho Cordova | rayo@californialab.com | 2007-09-01 |
| CalPoly_SLO | California Polytechnic State University San Luis Obispo | A california state polytechnic university located on the central coast of California in San Luis Obispo. | Chri Surfleet | | csurflee@calpoly.edu | 2018-05-10 |
| CalPoly_HSU | California Polytechnic State University, Humboldt | A California State Polytechnic University located on the north coast of California in Humboldt | | | | 2024-03-18 |
| CRC | California Rice Commission | California Rice Commission | Tim Johnson, Roberta Firoved | Sacramento | tjohnson@calrice.org, rfiroved@calrice.org | 2009-09-24 |
| CA_SCC | California State Coastal Conservancy | The Coastal Conservancy is a State agency established in 1976 to protect and improve natural lands and waterways, help people access and enjoy the outdoors, and sustain local economies along the length of CA?s coast and around San Francisco Bay | | | | 2023-12-28 |
| CSP-MC | California State Park Malibu Creek | California State Park Malibu Creek | | | | 2018-09-22 |
| CSP-Angeles | California State Parks Angeles District | California State Parks Angeles District | | | | 2017-12-22 |
| CSUS | California State University at Sacramento | California State University in Sacramento | Tod Granicher | Sacramento | tod.granicher@owp.csus.edu | 2017-01-09 |
| CSUCI | California State University Channel Islands | California State University Channel Islands | | | | 2013-04-03 |
| CSULB | California State University Long Beach | California State University Long Beach | Dessie Underwood | Long Beach | dlunderw@csulb.edu | 2012-08-30 |
| CSULB-IIRMES | California State University Long Beach Institute for Integrated Research in Materials, Environments, and Society | California State University Long Beach Institute for Integrated Research in Materials, Environments, and Society | Rich Gossett | Long Beach | richgossett@yahoo.com | 2010-03-23 |
| CSULB-SEAL | California State University Long Beach Stream Ecology and Assessment Laboratory | California State University Long Beach Stream Ecology and Assessment Laboratory | Dessie Underwood | Long Beach | dlunderw@csulb.edu | 2012-04-17 |
| CSUMB | California State University Monterey Bay | California State University Monterey Bay | Marc Los Huertos | Seaside | | 2011-10-31 |
| CSUMB-WEE | California State University Monterey Bay Watershed Environment and Ecology Lab | California State University Monterey Bay Watershed Environment and Ecology Lab | John Olson | Seaside | joolson@csumb.edu | 2019-04-30 |
| CSUSB | California State University San Bernardino | California State University San Bernardino | | | | 2013-04-09 |
| CSUSM | California State University, San Marcos | California State University, San Marcos | Robert Sheath | | | 2008-04-24 |
| CSUStan-CL | California State University, Stanislaus - Cover Lab | California State University, Stanislaus - Cover Lab | Matthew R. Cover | Turlock | mcover@biology.csustan.edu | 2010-07-07 |
| CTC | California Tahoe Conservancy | California Tahoe Conservancy | Jenna Hooper | Tahoe | jhooper@tahoe.ca.gov | 2013-06-14 |
| CalTrout | California Trout | California Trout | Janet Hatfield | Mammoth Lakes | janet@inyo-monowater.org | 2013-10-16 |
| CALWATLAB | California Water Labs | California Water Labs | | | | 2017-06-05 |
| CALWATER | California Water Service Company Lab | California Water Service Company Lab | | | | 2017-06-05 |
| CIWQS 7483 | CALIPATRIA CITY | | | | | 1900-01-01 |
| CIWQS 7485 | Calistoga City | | | | | 1900-01-01 |
| CIWQS 7514 | CALMAT COMPANY | | | | | 1900-01-01 |
| CALSCI | CalScience Laboratories | CalScience Laboratories | Bob Stearns | Garden Grove | bstearns@calscience.com | 2007-09-01 |
| CALTEST | CalTest Analytical Laboratory | CalTest Analytical Laboratory | Christine Horn | Napa | caltest@caltestlab.com | 2007-09-01 |
| CIWQS 10191 | Camarillo Sanitary District | | | | | 1900-01-01 |
| CAMSD | Camarillo Sanitation District | Camarillo Sanitation District | Mike Viani | Camarillo | | 2012-06-05 |
| CAMPBELL | Campbell Soup Company Central Environmental Lab | Campbell Soup Company Central Environmental Lab | | | | 2017-06-05 |
| CAMROSA | Camrosa Water District Laboratory | Camrosa Water District Laboratory | | | | 2017-06-05 |
| CANONIE | Canonie Environmental Services Lab | Canonie Environmental Services Lab | | | | 2017-06-05 |
| CAPCO | Capco Analytical Services, Inc. | Capco Analytical Services, Inc. | | | | 2011-10-31 |
| CapeFear | Cape Fear Analytical | Cape Fear Analytical | | | | 2020-03-27 |
| Cardno | Cardno | Cardno Environmental Consultants | Chris Donley | Sacramento | chris.donley@cardno.com | 2015-01-26 |
| CarlsbadCity | Carlsbad City | City of Carlsbad | | | | 2014-07-02 |
| CASC_Eng | CASC Engineering | CASC Engineering | Michael Kolbenschlag | Burbank | | 2014-07-09 |
| CMWD | Casitas Municipal Water District | Casitas Municipal Water District | | | | 2017-06-05 |
| CATE | Cate School | Cate School, Partner of SBCK | Jenna Driscoll | Santa Barbara | jennad@sbck.org | 2017-01-18 |
| CWD | Cawelo Water District | Cawelo Water District | David Hampton | Bakersfield | dhampton@cawelowd.org | 2014-07-09 |
| CDMS | CDM Smith | CDM Smith | Nola Mitchell | Truckee | mitchellna@cdmsmith.com | 2014-04-10 |
| CEIMIC | CEIMIC Corporation | CEIMIC Corporation | | Narragansett | | 2012-08-30 |
| CELA | CEL Analytical, Inc | CEL Analytical, Inc | Yeagie Dearborn | San Francisco | Yeggie@celanalytical.com | 2014-02-10 |
| CCAMP | Central Coast Ambient Monitoring Program | Central Coast Ambient Monitoring Program | Karen Worcester | San Luis Obispo | Kworcester@waterboards.ca.gov | 2011-10-25 |
| CCAL | Central Coast Analytical Lab, Santa Barbara | Central Coast Analytical Lab, Santa Barbara | | | | 2017-06-05 |
| CCSE | Central Coast Salmon Enhancement | Central Coast Salmon Enhancement | Steph Wald | Arroyo Grande | larissa.clarke@ccc.ca.gov | 2014-06-09 |
| CCWC | Central Coast Water Conservancy (CCWC) | CCWC is a coaltion of local non-profit and government agencies involved in land and water conservation that formed to coordinate efforts to conserve and augment in-stream flows for ecological benefits on the central coast of California. | Aleksandra Wydzga | | aleks@centralcoastsalmon.com | 2018-05-10 |
| CCWQP | Central Coast Water Quality Preservation, Inc. | Manages the Cooperative Monitoring Program on behalf of Central Coast growers enrolled in the Ag Order | Sarah Lopez, Technical Program Manager | Watsonville | sgreene@ccwqp.org | 2012-10-12 |
| CCWG-MLML | Central Coast Wetlands Group at Moss Landing Marine Labs | Central Coast Wetlands Group at Moss Landing Marine Labs | Ross Clark | Moss Landing | rclark@mlml.calstate.edu | 2014-09-03 |
| CCCSD | Central Contra Costa Sanitary District | Central Contra Costa Sanitary District | Tri Nguyen | Martinez | tnguyen@centralsan.dst.ca.us | 2007-12-21 |
| CSERC | Central Sierra Environmental Resource Center | Central Sierra Environmental Resource Center | Meg Layhee | Twain Harte | megl@cserc.org | 2017-02-28 |
| CERCO | Cerco Analytical, Inc. | Cerco Analytical, Inc. | | | | 2017-06-05 |
| CERES | Ceres Analytical Laboratory | Ceres Analytical Laboratory | | El Dorado Hills | jhedin@ceres-lab.com | 2024-08-29 |
| CERT | Certified Testing | Certified Testing | | | | 2017-06-05 |
| CH2MHILL | CH2M HILL | CH2M HILL - consultant | | Sacramento | | 2009-09-24 |
| CINMS | Channel Islands National Marine Sanctuary | Channel Islands National Marine Sanctuary | | | | 2013-04-03 |
| CINC | Channel Islands Neighborhood Council | Volunteer group for Channel Islands water sample collection | Karin Wisenbaker | | karin@aquaticbioassay.com | 2022-01-13 |
| CHEMANAL | Chemanal | Chemanal | | | | 2017-06-05 |
| CHEMWEST | Chemwest Analytical Laboratories, Inc. | Chemwest Analytical Laboratories, Inc. | | | | 2017-06-05 |
| CBL | Chesapeake Biological Laboratories | Chesapeake Biological Laboratories | Jerry Frank | Solomons | frank@umces.edu | 2017-03-16 |
| CPCC | Chevron Phillips Chemical Company | Chevron Phillips Chemical Company | | | | 2017-06-28 |
| CIWQS 481638 | CHEVRON USA INC | | | | | 1900-01-01 |
| CUPC | Chevron USA Products Company | Chevron USA Products Company | | | | 2013-04-03 |
| CIWQS 8451 | Chico City | | | | | 1900-01-01 |
| CHROMALAB | Chromalab, Inc. | Chromalab, Inc. | | | | 2017-06-05 |
| CIBA-GEIGY | Ciba-Geigy | Ciba-Geigy | | | | 2017-06-05 |
| CCSF | City and County of San Francisco | City and County of San Francisco | Anthony Rattonetti | San Francisco | trattone@sfwater.org | 2007-12-21 |
| CCSF-OBL | City and County of San Francisco - Oceanside Biology Lab | City and County of San Francisco - Oceanside Biology Lab | Michael G. Kellogg | San Francisco | mkellogg@sfwater.org | 2012-08-30 |
| CCSF-ORG | City and County of San Francisco - Organics Lab | City and County of San Francisco - Organics Lab | David Fok | San Francisco | dfok@sfwater.org | 2012-08-30 |
| CCRML | City of Carmel-By-The-Sea | City of Carmel-By-The-Sea | | Carmel-By-The-Sea | | 2012-07-30 |
| CC | City of Chico | City of Chico | | | | 2018-03-31 |
| CCV | City of Chula Vista | City of Chula Vista | Marisa Soriano | Chula Vista | msoriano@ci.chula-vista.ca.us | 2013-12-05 |
| CE | City of Encinitas | City of Encinitas | | | | 2013-10-29 |
| CES | City of Escondido | City of Escondido | | | | 2016-02-18 |
| CLN | City of Laguna Niguel | City of Laguna Niguel | Nancy Palmer | Laguna Niguel | | 2013-06-03 |
| CLBHHS | City of Long Beach Health and Human Services | City of Long Beach Health and Human Services | Hans Tritten | Long Beach | | 2012-05-07 |
| LBCPW | City of Long Beach Public Works | City of Long Beach Public Works | | | | 2018-06-14 |
| LABOSWPD | City of Los Angeles, Bureau of Sanitation, Watershed Protection | City of Los Angeles, Bureau of Sanitation, Watershed Protection | | | | 2017-03-24 |
| LAC_DPW_BSS | City of Los Angeles, Department of Public Works, Bureau of Street Services | City of Los Angeles, Department of Public Works, Bureau of Street Services | Nazario Sauceda | Los Angeles | bss.boss@lacity.org | 2018-06-22 |
| CLAEMD | City of Los Angeles, Environmental Monitoring Division | City of Los Angeles Environmental Monitoring Division Bureau of Sanitation, Environmental Monitoring Div | Curtis Cash | Playa del Rey | curtis.cash@lacity.org | 2012-06-27 |
| OS | City of Oceanside | City of Oceanside | Unknown | Oceanside | | 2012-05-07 |
| COXLSP | City of Oxnard Laboratory Services Program | City of Oxnard Laboratory Services Program, Public Works Administration | City Hall | Oxnard | | 2012-05-07 |
| PRC | City of Paso Robles | City of Paso Robles | | Paso Robles | | 2017-05-08 |
| CPL | City of Porterville Laboratory | City of Porterville Laboratory | | Porterville | engbldg@ci.porterville.ca.us | 2012-08-02 |
| CSD | City of San Diego | City of San Diego | | | | 2012-05-07 |
| EMTS | City of San Diego Environmental Monitoring & Technical Services Laboratory | City of San Diego Environmental Monitoring & Technical Services Laboratory | | | | 2016-11-18 |
| CSD_TSW | City of San Diego Transportation & Storm Water Department | City of San Diego Transportation & Storm Water Department | | | | 2020-03-27 |
| CSJ-ESD-WSP-SM | City of San Jose - Environmental Services Department - Watershed Protection Division - Stormwater Management | City of San Jose - Environmental Services Department - Wastershed Protection Division - Stormwater Management | Carol Boland | San Jose | Carol.Boland@sanjoseca.gov | 2016-07-11 |
| CSJ | City of San Jose Water Pollution Control Plant | City of San Jose Water Pollution Control Plant | Environmental Services | San Jose | esdwebmaster@sanjoseca.gov | 2007-12-21 |
| CSC | City of Santa Cruz | City of Santa Cruz | | Santa Cruz | | 2019-10-09 |
| CSM | City of Santa Monica | City of Santa Monica | Rick Valte | Santa Monica | rick.valte@smgov.net | 2012-11-20 |
| CSR | City of Santa Rosa | City of Santa Rosa | Heaven Moore | Santa Rosa | hmoore@srcity.org | 2017-06-28 |
| CS | City of Santee | City of Santee | Helen Davies | Santee | hdavies@ci.santee.ca.us | 2013-05-03 |
| COSVWWTPL | City of Simi Valley WWTP laboratory | City of Simi Valley WWTP laboratory | | | | 2019-06-04 |
| CTDPW | City of Torrance Department of Public Works | City of Torrance Department of Public Works | | Torrance | | 2018-04-19 |
| Vallejo | City of Vallejo | City of Vallejo | | | | 2012-08-30 |
| CV | City of Ventura | City of Ventura | | | | 2013-04-03 |
| WC | City of Watsonville | City of Watsonville | Emma Pickering | Watsonville | emma.pickering@cityofwatsonville.org | 2016-06-15 |
| WC_Lab | City of Watsonville Lab | City of Watsonville Public Works & Utilities Lab | | Watsonville | | 2016-07-28 |
| CYC | City of Yuba City Water/Wastewater Laboratory | City of Yuba City Water/Wastewater Laboratory | Michael L. Paulucci | Yuba City | | 2014-01-16 |
| CWE | Civil, Water, Environmental | Civil, Water, Environmental | Gerald Greene | Fullerton | ggreene@cwecorp.com | 2013-09-30 |
| CKY | CKY Inc. Analytical Laboratories | CKY Inc. Analytical Laboratories | | | | 2017-06-05 |
| CKY_PT | CKY Inc. Analytical Laboratories, Pleasanton and Torrence | CKY Inc. Analytical Laboratories, Pleasanton and Torrence | | | | 2017-06-05 |
| CLARKSON | Clarkson Laboratory and Supply Inc. | Clarkson Laboratory and Supply Inc. | | | | 2017-06-05 |
| CLAYTON | Clayton Environmental | Clayton Environmental | | | | 2017-06-05 |
| CIWQS 8809 | Clear Creek CSD | | | | | 1900-01-01 |
| CLERC | Clear Lake Environmental Research Center | | | | | 2021-09-29 |
| CLSB | Clinical Laboratory of San Bernardino | Clinical Laboratory of San Bernardino | | | | 2016-06-03 |
| CIWQS 8865 | Clovis City | | | | | 1900-01-01 |
| CMANAL | CM Analytical, Inc. | CM Analytical, Inc. | | | | 2017-06-05 |
| CIWQS 8901 | Coachella SD | | | | | 1900-01-01 |
| CVILC | Coachella Valley Irrigated Lands Coalition | Coachella Valley Irrigated Lands Coalition | | | contact.us@cvilc.ag | 2021-08-03 |
| CVWD | Coachella Valley Water District | Coachella Valley Water District | | Coachella | | 2021-08-03 |
| CIWQS 8902 | Coachella Valley WD | | | | | 1900-01-01 |
| CURES | Coalition for Urban/Rural Environmental Stewardship | Coalition for Urban/Rural Environmental Stewardship | Parry Klassen | | pklassen@unwiredbb.com | 2013-04-29 |
| CCAS | Coast to Coast Analytical Specialists, Inc. | Coast to Coast Analytical Specialists, Inc. | | Garland | info@ccaslab.com | 2012-05-07 |
| CCR | Coastal Conservation and Research | Coastal Conservation and Research Non-Profit Foundation | James Oakden | Moss Landing | joakden@gmail.com | 2015-01-28 |
| CSLRCD | Coastal San Luis Resource Conservation District | Coastal Resource Conservation District | | | | 2018-01-12 |
| CWC | Coastal Watershed Council | Coastal Watershed Council | Debie Chirco-Macdonald | Santa Cruz | djchirco@coastal-watershed.org | 2012-11-28 |
| CIWQS 9009 | Colfax City | | | | | 1900-01-01 |
| CIWQS 9014 | College of the Redwoods | | | | | 1900-01-01 |
| CIWQS 9021 | Collins Pine Company Chester | | | | | 1900-01-01 |
| CAS | Columbia Analytical Services | Columbia Analytical Services | | | | 2011-05-12 |
| CIWQS 9073 | Colusa City | | | | | 1900-01-01 |
| ColusaCounty | Colusa County | Colusa County | | | | 2017-06-08 |
| Condor | Condor Earth Technologies | Condor Earth Technologies | Micheline Kipf | Stockton | mkipf@condorearth.com | 2019-12-19 |
| CFR | Conservation Farms and Ranches, Inc. | Conservation Farms and Ranches, Inc., Non-profit affiliate of The Nature Conservancy and operator of Staten Island as a multi-use wetland and cropping system | Emily Wells | Thornton | emily.wells@cfrstaten.com | 2021-07-02 |
| CCCWP | Contra Costa Clean Water Program | Contra Costa Clean Water Program | Jamison Crosby | | jcros@pw.cccounty.us | 2012-08-30 |
| CCRCD | Contra Costa Resource Conservation District | Contra Costa Resource Conservation District | | Concord | | 2018-10-03 |
| CCWDL | Contra Costa Water District Laboratory, Concord | Contra Costa Water District Laboratory, Concord | | | | 2017-06-05 |
| CFEP | Controls for Environmental Pollution | Controls for Environmental Pollution | | | | 2017-06-05 |
| CONVERSE | Converse Envirolab, Inc. | Converse Envirolab, Inc. | | | | 2017-06-05 |
| COOK | Cook Research Lab | Cook Research Lab | | | | 2017-06-05 |
| CORE | Core Laboratories, Inc. | Core Laboratories, Inc. | | | | 2017-06-05 |
| CIWQS 9406 | Corning City | | | | | 1900-01-01 |
| CIWQS 524675 | Corona City DWP | | | | | 1900-01-01 |
| CDMWTPL | Corona Del Mar Water Treatment Plant Laboratory | Corona Del Mar Water Treatment Plant Laboratory | | | | 2017-06-28 |
| Ccity | Coronado City | Coronado City | | | | 2015-07-06 |
| CNR | Coronado Naval Reserve | Coronado Naval Reserve | Ewan Moffat | San Diego | | 2012-05-07 |
| CWH | Council for Watershed Health | The Council's mission is to facilitate an inclusive consensus process to enhance the economic, social, and ecological health of the region's watersheds through education, research, and planning. | Emily Daniels | | emily@watershedhealth.org | 2015-06-11 |
| DN | County of Del Norte Health and Human Care | County of Del Norte Health and Human Care | Leon Perrault | Crescent City | | 2012-05-07 |
| CMaEHS | County of Marin Environmental Health Services | County of Marin Environmental Health Services | Robert Turner | San Rafel | | 2012-05-07 |
| CMeEHS | County of Mendocino Environmental Health | County of Mendocino Environmental Health | John Morley | Ukiah | | 2012-05-07 |
| MY | County of Monterey Department of Health Division of Environmental Health | County of Monterey Department of Health Division of Environmental Health | Roger Beretti | Monterey | | 2012-05-07 |
| CSDDEH | County of San Diego Department of Environmental Health | County of San Diego Department of Environmental Health | Ewan Moffat | San Diego | | 2012-05-07 |
| CSHSEHD | County of Sonoma Health Services Environmental Health Division | County of Sonoma Health Services Environmental Health Division | Terry Macute | Santa Rosa | | 2012-05-07 |
| Cranmer | Cranmer Engineering Inc | Cranmer Engineering Inc | | | | 2018-03-27 |
| CEI | Cranmer Enginering and Anaytical Laboratory | Cranmer Enginering and Anaytical Laboratory | | Grass Valley | lab@cranmerengineeringinc.com | 2017-04-25 |
| CEL | Creek Environmental Laboratories, Inc. | Creek Environmental Laboratories, Inc. | Orval Osborne | San Luis Obispo | oosborne@fix.net | 2013-10-25 |
| CIWQS 9674 | Crescent City | | | | | 1900-01-01 |
| CCWQL | Crescent City Water Quality Laboratory | Crescent City Water Quality Laboratory | | Crescent City | | 2018-07-25 |
| Cressey | Cressey and Associates | Cressey and Associates | Scott Cressey | El Cerrito | | 2012-09-04 |
| CRGML | CRG Marine Laboratories, Inc. | CRG Marine Laboratories, Inc. | Rich Gossett | Torrance | info@crgmarinelabs.com | 2007-09-01 |
| CIWQS 9704 | Crockett Cogeneration | | | | | 1900-01-01 |
| CROSBY | Crosby Laboratories, Inc. | Crosby Laboratories, Inc. | | | | 2017-06-05 |
| CIWQS 9780 | Crystal Creek Aggregate Inc | | | | | 1900-01-01 |
| CSUF | CSU Fresno, Lab | CSU Fresno, Lab | | | | 2017-06-05 |
| CulverCity | Culver City | Culver City (within Los Angeles County) | | | | 2024-05-03 |
| CATL | Curtis and Tompkins, Ltd | Curtis and Tompkins, Ltd | | Berkeley | | 2017-02-22 |
| DPC | Dana Point City | City of Dana Point | | | | 2019-02-13 |
| DCE | Dancing Coyote Environmental | Dancing Coyote Environmental | Julie Schneider Ljubenkov | Pauma Valley | jsl@artnatureeducation.com | 2015-11-16 |
| DataChem | DataChem Laboratories, Inc | DataChem Laboratories, Inc | | Salt Lake City | | 2011-04-07 |
| DAVI | Davi Laboratories Environmental Associates | Davi Laboratories Environmental Associates | | | | 2017-06-05 |
| CIWQS 12331 | Davis City | | | | | 1900-01-01 |
| DEAN | Dean Laboratories, Norco | Dean Laboratories, Norco | | | | 2017-06-05 |
| LABQA | default setting for lab generated QA samples | default setting for lab generated QA samples | | | | 2007-09-01 |
| DEL | Del Mar Analytical | Del Mar Analytical | Patty Mata | Irvine | | 2017-05-25 |
| DELMAR | Del Mar Analytical, Colton | Del Mar Analytical, Colton | | | | 2017-06-05 |
| DelMarCity | Del Mar City | City of Del Mar | | | | 2014-07-02 |
| DelNorteCounty | Del Norte County | Del Norte County | | | | 2017-06-08 |
| DDLV | Dellavalle Laboratory, Inc. | Dellavalle Laboratory, Inc. | | Fresno | | 2009-02-19 |
| CIWQS 12599 | Delta Diablo Sanitation District | | | | | 1900-01-01 |
| DeltaEnv | Delta Environmental Lab | Delta Environmental Lab | Dr. Hossein Khosh Khoo | Benicia | deltahk1@sbcglobal.net | 2011-01-25 |
| DELTAKEEPER | Deltakeeper | Deltakeeper | | | | 2017-06-05 |
| DEL-TECH | Del-Tech Geotechnical Support Services | Del-Tech Geotechnical Support Services | | | | 2010-12-03 |
| DFW | Department of Fish and Wildlife | Department of Fish and Wildlife Office used for historic purposes when the Office is unknown | | | | 2012-03-07 |
| DFW-BDD | Department of Fish and Wildlife - Bay Delta Division | DFW Stockton, CA | | | | 2012-08-30 |
| DFW-Belden | Department of Fish and Wildlife Belden Office | Department of Fish and Wildlife Belden Office | | | | 2008-08-26 |
| DFW-LOSALA | Department of Fish and Wildlife Los Alamitos Office | Department of Fish and Wildlife Los Alamitos Office | | Los Alamitos | | 2010-08-13 |
| DFW-Portola | Department of Fish and Wildlife Portola Office | Department of Fish and Wildlife Portola Office | Amber Rossi | Portola | | 2008-11-07 |
| DFW-RED | Department of Fish and Wildlife Redding Office | Department of Fish and Wildlife Redding Office | | | | 2008-06-20 |
| DFW-SanDiego | Department of Fish and Wildlife San Diego Office | Department of Fish and Wildlife San Diego Office | | | | 2013-03-04 |
| DFW-Weave | Department of Fish and Wildlife Weaverville Office | Department of Fish and Wildlife Weaverville Office | | | | 2011-08-19 |
| DFW-Yreka | Department of Fish and Wildlife Yreka Office | Department of Fish and Wildlife Yreka Office | Caitlin Bean | Yreka | Caitlin.Bean@wildlife.ca.gov | 2022-02-22 |
| DFW-OSPR | Department of Fish and Wildlife-OSPR | Department of Fish and Wildlife Office of Spill Prevention and Response | | Sacramento | | 2016-01-14 |
| DWR | Department of Water Resources - Sacramento Office | Department of Water Resources - Sacramento Office | | | | 2011-06-27 |
| DWR-BRYTE | Department of Water Resources Bryte Analytical Laboratory | Department of Water Resources Bryte Analytical Laboratory | | West Sacramento | | 2007-09-01 |
| DWR-CASTAIC | Department of Water Resources Castaic Analytical Laboratory | Department of Water Resources Castaic Analytical Laboratory | | | | 2017-06-05 |
| DWR-SCRO | Department of Water Resources, South Central Region Office | Department of Water Resources, South Central Region Office | Abimael Le?n | Fresno | aleoncar@water.ca.gov | 2013-08-29 |
| CIWQS 12837 | Dicalite Minerals Corp | | | | | 1900-01-01 |
| Dionex | Dionex | Dionex | | | | 2007-09-01 |
| D-Max | D-Max Engineering, Inc | D-Max Engineering, Inc | John Quenzer | San Diego | jquenzer@dmaxinc.com | 2013-05-03 |
| CIWQS 13111 | Donner Summit Public Utilities District | | | | | 1900-01-01 |
| CIWQS 13129 | Dos Cuadras Offshore Res. LLC | | | | | 1900-01-01 |
| DOWAGRO | Dow Agrosciences Analytical Laboratory, Indianapolis | Dow Agrosciences Analytical Laboratory, Indianapolis | | | | 2017-06-05 |
| DOWCHEM | Dow Chemical USA, Western Division, Pittsburg | Dow Chemical USA, Western Division, Pittsburg | | | | 2017-06-05 |
| Risebrough | Dr. Robert Risebrough's laboratory at the UCB Richmond Field Station | Dr. Robert Risebrough's laboratory at the UCB Richmond Field Station | Robert Risebrough | Berkeley | | 2007-12-21 |
| DCC | Dry Creek Conservancy | Dry Creek Conservancy | | | | 2010-10-19 |
| DU | Ducks Unlimited | Ducks Unlimited is a nonprofit organization established in 1937 to conserve wetlands, grasslands, and associated habitats to benefit waterfowl, other wildlife, and communities | | | | 2023-12-28 |
| DUDEK_Encinitas | Dudek Environmental and Engineering, Encinitas | Dudek Environmental and Engineering, Encinitas | Chris Oesch | Encinitas | coesch@dudek.com | 2021-01-14 |
| Duke | Duke University | Duke University | P. Lee Ferguson | Durham | | 2019-10-31 |
| CIWQS 13316 | Dunsmuir City | | | | | 1900-01-01 |
| DYNAMIC | Dynamic Consultants, Inc. | Dynamic Consultants, Inc. | | | | 2017-06-05 |
| E&S | E&S Environmental Chemistry, Inc. | E&S Environmental Chemistry, Inc. | Todd McDonnell | Corvallis | todd.mcdonnell@esenvironmental.com | 2017-03-16 |
| ESJWQC | E. San Joaquin Water Quality Coalition | E. San Joaquin Water Quality Coalition (RWB5Irrigated Lands Monitoring) | | | | 2017-06-05 |
| EagleLkGuard | Eagle Lake Guardians | Local Citizen Group advocating for the protection of Eagle Lake, Pine Creek Watershed and Eagle Lake Rainbow Trout | Val Aubrey | Susanville | eaglelakeguardians@yahoo.com | 2019-01-14 |
| EALCORP | EAL Corporation Laboratory | EAL Corporation Laboratory | | | | 2017-06-05 |
| EBMUD | East Bay Municipal Utility District | East Bay Municipal Utility District | Francois Rodigari | Oakland | frodigar@ebmud.com | 2007-12-21 |
| CIWQS 14380 | EAST BAY MUNICIPAL UTILITY DISTRICT (Water Plants) | | | | | 1900-01-01 |
| CIWQS 14384 | East Bay Reg Park Dist, Union SD & EBDA | | | | | 1900-01-01 |
| EBRPD | East Bay Regional Park District | East Bay Regional Park District | Matt Graul | Berkeley | | 2012-05-07 |
| ECCCHC | East Contra Costa County Habitat Conservancy | The East Contra Costa County Habitat Conservancy is a joint exercise of powers authority formed by the Cities of Brentwood, Clayton, Oakley and Pittsburg and Contra Costa County to implement the East Contra Costa County Habitat Conservation Plan / Natural | | | | 2019-09-27 |
| CIWQS 309528 | Eastern Municipal Water District | | | | | 1900-01-01 |
| CIWQS 497348 | Eco Resources Inc | | | | | 1900-01-01 |
| EcoAnalysts | EcoAnalysts, Inc | EcoAnalysts, Inc | Gary Lester | Moscow | glester@ecoanalysts.com | 2014-09-04 |
| ESC | Ecological System Corporation (DOMINGUES WS) | Ecological System Corporation (DOMINGUES WS) | | | | 2017-06-05 |
| ECORP-Rocklin | ECORP Consulting, Inc. Rocklin | ECORP Consulting, Inc. Rocklin | | Rocklin | | 2017-08-04 |
| Edge_Corvallis | Edge Analytical Laboratories, Corvallis Laboratory | Edge Analytical Laboratories, Corvallis | Sarah Miller | Corvallis | smiller@edgeanalytical.com | 2021-01-15 |
| CEC | El Cajon City | El Cajon City | Jaime Campos | El Cajon | jcampos@cityofelcajon.us | 2013-12-03 |
| CIWQS 11077 | El Centro City | | | | | 1900-01-01 |
| ElDoradoCounty | El Dorado County | El Dorado County | | | | 2017-06-08 |
| CIWQS 14606 | El Dorado Irrigation District | | | | | 1900-01-01 |
| EID | El Dorado Irrigation District Monitoring | El Dorado Irrigation District Monitoring | Brian Deason | Placerville | bdeason@eid.org | 2016-11-28 |
| EDTU | El Dorado Trout Unlimited | El Dorado Trout Unlimited | | | | 2016-02-03 |
| eli | elimnology, Inc. | elimnology, Inc. | Eli Kersh, CLM | Point Richmond | ekersh@elimnology.com | 2020-09-17 |
| EGCDPW | Elk Grove City Dept of Public Works | City of Elk Grove Dept. of Public Works | | | | 2017-03-31 |
| EKR | Elk Valley Rancheria | Elk Valley Rancheria | | | | 2017-06-05 |
| ESNERR | Elkhorn Slough National Estuarine Research Reserve NOAA | Elkhorn Slough National Estuarine Research Reserve National Oceanic Atmospheric Administration | John Haskins | | | 2014-06-10 |
| EMAX | EMAX Laboratories, Inc. | EMAX Laboratories, Inc. (EMAX) provides comprehensive environmental laboratory services to governmental, state, and local agencies. | Jim Carter | Torrance | jcarter@emaxlabs.com | 2013-08-07 |
| EMCON | Emcon Associates | Emcon Associates | | | | 2017-06-05 |
| EMSL | EMSL Analytical, Inc. | EMSL Analytical, Inc. | | San Leandro | sanleandrolab@emsl.com | 2016-01-10 |
| EN | Encina | Encina | Ewan Moffat | Missing | | 2012-05-07 |
| EWA | Encina Wastewater Authority | Encina Wastewater Authority | Unknown | Carlsbad | | 2012-05-07 |
| ENGINSCI | Engineering Science | Engineering Science | | | | 2017-06-05 |
| ENSECO-CAL | ENSECO-CAL, Orange County | ENSECO-CAL, Orange County | | | | 2017-06-05 |
| ENSECO-CRL | ENSECO-CRL, Ventura | ENSECO-CRL, Ventura | | | | 2017-06-05 |
| ENTHALPY | Enthalpy Analytical, Inc. | Enthalpy Analytical, Inc. | Ranjit Clarke | Orange | ranjit.clarke@enthalpy.com | 2016-03-01 |
| ENTHALPY_Berkeley | Enthalpy Analytical, Inc., Berkeley | Enthalpy Analytical, Inc., Berkeley | | Berkeley | info@enthalpy.com | 2017-12-15 |
| ENTHALPY_EDH | Enthalpy Analytical, Inc., EDH | Enthalpy Analytical, Inc., EDH | | El Dorado Hills | | 2023-11-27 |
| ENTHALPY_SanDiego | Enthalpy Analytical, Inc., San Diego | Enthalpy Analytical, Inc., San Diego | | San Diego | | 2024-02-16 |
| ENTHALPY_Wilmington | Enthalpy Analytical, Inc., Wilmington NC | Enthalpy Analytical, Inc., Wilmington NC | | Wilmington | | 2021-06-30 |
| ENVIRO-CHEM | Enviro-Chem Laboratories, Inc. | Enviro-Chem Laboratories, Inc. | | | | 2017-06-05 |
| EnviroMatrix | EnviroMatrix Analytical, Inc. | EnviroMatrix Analytical, Inc. | Dan Verdon | San Diego | | 2013-01-18 |
| EELI | Environmental Engineering Lab, Inc., San Diego | Environmental Engineering Lab, Inc., San Diego | | | | 2017-06-05 |
| EHL | Environmental Health Labs | Environmental Health Labs | | | | 2017-06-05 |
| ELNI | Environmental Laboratory Network, Inc. | Environmental Laboratory Network, Inc. (formerly known as EnviroMatrix Analytical Inc.) | | San Diego | | 2022-04-22 |
| EMA | Environmental Micro Analysis | Environmental Micro Analysis | Don Peterson | Woodland | dpeterson@emalab.com | 2012-08-30 |
| EMASI | Environmental Monitoring and Services, Inc., Lab | Environmental Monitoring and Services, Inc., Lab | | | | 2017-06-05 |
| EPARD | Environmental Protection Agency office of Research and Development | USEPA National Health and Environmental Effects Research Lab/ORD Western Ecology Divisn | Robert J Ozretich | Corvallis | ozretich.robert@epa.gov | 2012-05-07 |
| UCD-EQL | Environmental Quality Laboratory | Environmental Quality Laboratory | Peter Green | Davis | pggreen@ucdavis.edu | 2007-09-01 |
| ERGI | Environmental Research Group, Inc., Lab | Environmental Research Group, Inc., Lab | | | | 2017-06-05 |
| ETS | Environmental Technical Service | Environmental Technical Service | Greg Conrad | Petaluma | | 2016-12-07 |
| EWG | Environmental Working Group | Environmental Working Group | | | | 2012-08-30 |
| EOA | EOA, Inc. | Eisenberg, Olivieri & Associates | | Oakland | | 2012-08-30 |
| EPA-R9 | EPA Region 9 Lab | EPA Region 9 Lab | Andy Lincoff | Richmond | | 2007-09-01 |
| CIWQS 14960 | Escondido City | | | | | 1900-01-01 |
| ECWQL | Escondido City Water Quality Laboratory | Escondido City Water Quality Laboratory | | | | 2017-06-28 |
| EUREKA | Eureka Laboratories, Inc. | Eureka Laboratories, Inc. | | | | 2017-06-05 |
| EuroFins | Eurofins | Eurofins | Magnolia Busse | Folsom | MagnoliaBusse@eurofinsus.com | 2015-08-17 |
| Eurofins_Tustin | Eurofins Built Environment Testing - Tustin | Eurofins Built Environment Testing - Tustin | | Tustin | Env.Marketing@ET.EurofinsUS.com | 2024-09-09 |
| EuroCal_Irvine | Eurofins Calscience Irvine | Eurofins Calscience Irvine | | | | 2022-02-25 |
| EEA | Eurofins Eaton Analytical, Inc. | Eurofins Eaton Analytical, Inc. | | Monrovia | | 2016-08-19 |
| EFGS | Eurofins Frontier Global Sciences | Eurofins Frontier Global Sciences | Patrick Garcia-Strickland | Bothell | FrontierGS@EurofinsUS.com? ? | 2017-11-22 |
| EXADMS | Exa Data & Mapping Services | Exa Data & Mapping Services | | | | 2010-02-18 |
| ExcelChem | Excelchem Environmental Labs | Excelchem Environmental Labs | John Somers | Rocklin | | 2012-02-01 |
| CIWQS 29010 | ExxonMobil Oil Corporation Torrance | | | | | 1900-01-01 |
| CIWQS 15842 | Fairfield Suisun Sewer District | | | | | 1900-01-01 |
| FSURMP | Fairfield Suisun Urban Runoff Management Program | Fairfield Suisun Urban Runoff Management Program | Kevin Cullen | Fairfield | | 2013-01-24 |
| FARWEST | Far West Laboratories, Riverbank | Far West Laboratories, Riverbank | | | | 2017-06-05 |
| FRCRM | Feather River Coordinated Resource Management Group | Feather River Coordinated Resource Management Group | Leslie Mink | Quincy | plumasco@psln.com | 2012-07-19 |
| CIWQS 16050 | Ferndale City | | | | | 1900-01-01 |
| FFIC | Firemans Fund Insurance Companies, Environmental Lab | Firemans Fund Insurance Companies, Environmental Lab | | | | 2017-06-05 |
| FISHBIO | FISHBIO | Fisheries and Environmental Consulting Company | | | | 2021-11-03 |
| FFC | Fishery Foundation of California | Fishery Foundation of California | Trevor Kennedy | | tkennedy@fisheryfoundation.org | 2021-10-14 |
| FMC | FMC Lab | FMC Lab | | | | 2017-06-05 |
| Fordham | Fordham University | Fordham University | | | | 2018-02-21 |
| FASI | Forensic Analytical Specialties, Inc. | Forensic Analytical Specialties, Inc. | | | | 2017-06-05 |
| CIWQS 16413 | Forestville Water District | | | | | 1900-01-01 |
| FBC | Fort Bragg City | Fort Bragg City | Teri Jo Barber | Fort Bragg | | 2016-06-06 |
| FBML | Fort Bragg Municipal Laboratory | Fort Bragg Municipal Laboratory | | Fort Bragg | | 2016-07-05 |
| CIWQS 16475 | Fortuna City | | | | | 1900-01-01 |
| CIWQS 16691 | Fresno City | | | | | 1900-01-01 |
| FresnoCounty | Fresno County | Fresno County | | | | 2017-06-08 |
| FCPHL | Fresno County Public Health Laboratory | Fresno County Public Health Laboratory | | | | 2017-06-05 |
| FoCC | Friends of Concord Creeks | Friends of Concord Creeks | | | | 2024-08-02 |
| FDC | Friends of Deer Creek | Friends of Deer Creek | | Nevada City | | 2010-10-19 |
| FSRC | Friends of San Ramon Creek | Friends of San Ramon Creek | | | | 1900-01-01 |
| FOSC | Friends of Sausal Creek | Friends of Sausal Creek | | Oakland | coordinator@sausalcreek.org | 1900-01-01 |
| Frog | Frog Environmental | Frog Environmental | Frog Environmental | Carson | Ag@frogenv.com | 2020-05-20 |
| FAL | Frontier Analytical Laboratory | Frontier Analytical Laboratory | | El Dorado Hills | | 2018-02-13 |
| FGS | Frontier Geosciences, Inc. | Frontier Geosciences, Inc. | Dustin Leen | Seattle | dustinl@frontiergeosciences.com | 2007-09-01 |
| FGLE | Fruit Growers Lab (FGL Environmental) | Fruit Growers Lab (FGL Environmental) | | St Santa Paula | http://www.fglinc.com/ | 2008-01-01 |
| FGLE-Stockton | Fruit Growers Lab (FGL Environmental) Stockton | Fruit Growers Lab (FGL Environmental) | | Stockton | | 2023-10-31 |
| CIWQS 17625 | Galt City | | | | | 1900-01-01 |
| GANDA | Garcia and Associates | Garcia and Associates | Ian Chan | Tahoe City | iananthonychan@aol.com | 2016-11-23 |
| GCAL | Garratt-Callahan Analytical Laboratory | Garratt-Callahan Analytical Laboratory | | | | 2017-06-05 |
| GWMA | Gateway Water Management Authority | Gateway Water Management Authority | | | | 2017-07-13 |
| GEI | GEI Consultants, Inc. | Environmental Consulting/Engineering | Ashley Ficke | Denver | aficke@geiconsultants.com | 2019-03-14 |
| GEL | GEL Laboratories | GEL Laboratories | | | | 2022-02-25 |
| CIWQS 31242 | General Dynamics National Steel & Shipbuilding Co (NASSCO) | | | | | 1900-01-01 |
| CIWQS 17824 | General Electric Co | | | | | 1900-01-01 |
| GEOANAL | Geoanalytical Laboratories, Inc. | Geoanalytical Laboratories, Inc. | | | | 2017-06-05 |
| GERG | Geochemical and Environmental Research Group | Geochemical and Environmental Research Group | Jose L.Sericano | College Station | jose@gerg.tamu.edu | 2007-12-21 |
| GEOMONITOR | Geo-Monitor, Inc. | Geo-Monitor, Inc. | | | | 2017-06-05 |
| GCSU | Georgia College and State University | Georgia College and State University | | | | 2018-02-21 |
| GC | Geosyntec Consultants | Geosyntec Consultants | | Huntington Beach | | 2014-07-15 |
| Geosyntec_Sac | Geosyntec Consultants, Sacramento | Geosyntec Consultants - Sacramento office | | | | 2021-06-25 |
| GlennCounty | Glenn County | Glenn County | | | | 2017-06-08 |
| GGC-Canoga | Global Geochemical Corporation, Canoga Park | Global Geochemical Corporation, Canoga Park | | | | 2017-06-05 |
| GRRCD | Gold Ridge RDC | Gold Ridge Resource Conservation District | Sierra Cantor | | sierra@goldridgercd.org | 2016-11-01 |
| GGNRA | Golden Gate National Recreation Area | | | | | 2022-04-14 |
| GOLDPL | Golden Pacific Laboratories | Golden Pacific Laboratories | | | | 2017-06-05 |
| Golder | Golder | Golder | | | | 2019-02-21 |
| CIWQS 18325 | GOLETA SD | | | | | 1900-01-01 |
| GLC | Goose Lake Coalition | Goose Lake Coalition | Herb Jasper | New Pine Creek | bry.jasper@oregonstate.edu | 2009-09-24 |
| GPL | GPL Laboratories Lllp | GPL Laboratories Lllp | | Gaithersgurg | | 2012-05-07 |
| GMA | Graham Matthews and Associates | Graham Matthews and Associates | Graham Matthews | Weaverville | | 2013-03-28 |
| CIWQS 19392 | Granite Rock Co | | | | | 1900-01-01 |
| CIWQS 18512 | Grass Valley City | | | | | 1900-01-01 |
| GBP | Grassland Bypass Project | Grassland Bypass Project | Chris Linneman | Hanford | linneman@summerseng.com | 2018-01-16 |
| GrassrootsEcology | Grassroots Ecology | Grassroots Ecology | Jeremy Merckling | Palo Alto | jeremy@grassrootsecology.org | 2018-07-02 |
| GBOC | Grassy Bar Oyster Company | Privately-owned oyster farm | George Trevelyan | Morro Bay | gboysterco@gmail.com | 2015-06-02 |
| GHWRMC-1415 | Greater Harbor Waters Regional Monitoring Coalition 2014/15 | Greater Harbor Waters Regional Monitoring Coalition 2014/15 | | Long Beach | anthony.arevalo@longbeach.gov | 2015-12-03 |
| GHWRMC-1516 | Greater Harbor Waters Regional Monitoring Coalition 2015/16 | In reporting year 2015/16, this group consists of the following entities: Bellflower City, Lakewood City, Long Beach City, Los Angeles City, Paramount City, Rancho Palos Verdes City, Rolling Hills City, Rolling Hills Estates City, Signal Hill City,? | | Long Beach | anthony.arevalo@longbeach.gov | 2016-11-16 |
| GHWRMC-1617 | Greater Harbor Waters Regional Monitoring Coalition 2016/17 | Greater Harbor Waters Regional Monitoring Coalition 2016/17 | | Long Beach | anthony.arevalo@longbeach.gov | 2017-11-22 |
| GHWRMC-1718 | Greater Harbor Waters Regional Monitoring Coalition 2017/18 | In reporting year 2017/18, the RMC consisted of 19 entities as listed in the Annual Report that is submitted to the Water Board | James Vernon | Long Beach | | 2018-11-27 |
| GHWRMC-1819 | Greater Harbor Waters Regional Monitoring Coalition 2018/19 | In reporting year 2018/19, the RMC consisted of 19 entities as listed in the Annual Report that is submitted to the Water Board. | | | | 2019-11-09 |
| GHWRMC-1920 | Greater Harbor Waters Regional Monitoring Coalition 2019/20 | In reporting year 2019/20, the RMC consisted of 19 entities as listed in the Annual Report that is submitted to the Water Board. | James Vernon | Long Beach | james.vernon@polb.com | 2020-12-18 |
| GVLR | Green Valley Lake Recreation | Company responsible for managing recreation at Green Valley Lake | | | | 2023-11-06 |
| GWL | Green Water Laboratories | Green Water Laboratories | Mark Aubel | Palatka | markaubel@greenwaterlab.com | 2017-03-16 |
| CIWQS 18681 | Grizzly Lake Resort Imp Dist | | | | | 1900-01-01 |
| GTEL | GTEL Environmental Laboratories, Inc. | GTEL Environmental Laboratories, Inc. | | | | 2017-06-05 |
| HGPRATT | H.G. Pratt Company | H.G. Pratt Company | | | | 2017-06-05 |
| HPUL | Habematolel Pomo of Upper Lake | Habematolel Pomo of Upper Lake | Christina Harrison | | charrison@hpultribe-nsn.gov | 1900-01-01 |
| CIWQS 523382 | Hargis & Associates, Inc. | | | | | 1900-01-01 |
| HAWKSLEY | Hawksley Laboratory | Hawksley Laboratory | | | | 2017-06-05 |
| HCWPCFL | Hayward City Water Pollution Control Facility Laboratory | Hayward City Water Pollution Control Facility Laboratory | | | | 2017-06-05 |
| HML | Hazardous Materials Laboratory | Hazardous Materials Laboratory | | | | 2012-08-30 |
| HDR-SAC | HDR-Sacramento | HDR-Sacramento | | | | 2019-01-23 |
| CIWQS 20025 | Healdsburg City | | | | | 1900-01-01 |
| HDCSMEH | Health Department County of San Mateo Environmental Health | Health Department County of San Mateo Environmental Health | Greg Smith | Redwood City | | 2012-05-07 |
| CIWQS 20060 | Heber PUD | | | | | 1900-01-01 |
| HWDLWTP | Helix Water District R.M. Levy Water Treatment Plant | Helix Water District R.M. Levy Water Treatment Plant | | | | 2017-06-05 |
| HENRICI | Henrici Water Laboratory, Quincy | Henrici Water Laboratory, Quincy | | | | 2017-06-05 |
| CIWQS 20185 | HERITAGE RANCH CSD | | | | | 1900-01-01 |
| HPEL | Hewlett-Packard Environmental Lab | Hewlett-Packard Environmental Lab | | | | 2017-06-05 |
| HSWL | High Sierra Water Laboratory | High Sierra Water Laboratory | Mark Palmer | Truckee | hswaterlab@aol.com | 2007-09-01 |
| CIWQS 20513 | Holtville City | | | | | 1900-01-01 |
| CIWQS 21348 | Honeywell International Inc. | | | | | 1900-01-01 |
| Hoopa-Tribe | Hoopa Tribe | Hoopa Tribe | Louisa McCovey | Hoopa | louisadebrose@gmail.com | 2012-04-20 |
| HBPIT | Hopland Band Of Pomo Indians Tribal EPA | Hopland Band Of Pomo Indians Tribal EPA | | | | 2017-06-08 |
| HORNKOHL | Hornkohl Laboratories, Inc. | Hornkohl Laboratories, Inc. | | | | 2017-06-05 |
| HI | Houston Industries, Inc. | Houston Industries, Inc. | | | | 2013-04-03 |
| HDL-SanJose | Hull Development Lab, Inc., San Jose | Hull Development Lab, Inc., San Jose | | | | 2017-06-05 |
| HumboldtCounty | Humboldt County | Humboldt County | | | | 2017-06-08 |
| HCDEH | Humboldt County Division of Environmental Health | Environmental Health Division of Humboldt County | | | | 2019-07-15 |
| HCHHSDD | Humboldt County Health and Human Services Department Division of Environmental Health | Humboldt County Health and Human Services Department Division of Environmental Health | Harriet Hill | Eureka | | 2012-05-07 |
| HSU-SL | Humboldt State University Department of Biological Sciences Shaunghnessy Lab | Humboldt State University Department of Biological Sciences Shaunghnessy Lab | Dr. Frank J. Shaughnessy | | fjs3@humboldt.edu | 2013-09-26 |
| HFI | HydroFocus, Inc. | HydroFocus, Inc., Private hydrologic research firm | Steve Deverel | Davis | sdeverel@hydrofocus.com | 2021-07-02 |
| Hydrozoology | Hydrozoology | Hydrozoology | Wayne Fields | Newcastle | | 2019-05-24 |
| ICF-Los Angeles | ICF Los Angeles | ICF Los Angeles | | Los Angeles | | 2019-06-10 |
| ICF-Sacramento | ICF Sacramento | ICF Sacramento | Jeff Peters | Sacramento | jeff.peters@icf.com | 2017-08-04 |
| ICF-San Diego | ICF San Diego | ICF San Diego | | San Diego | | 2017-09-07 |
| ICRI | I-Chem Research, Inc. | I-Chem Research, Inc. | | | | 2017-06-05 |
| IEH | IEH Aquatic Research | IEH Aquatic Research | | Seattle | | 2016-10-12 |
| IBCity | Imperial Beach City | Imperial Beach City | | | | 2015-04-24 |
| CIWQS 21588 | Imperial CCD | | | | | 1900-01-01 |
| CIWQS 21610 | Imperial City | | | | | 1900-01-01 |
| ImperialCounty | Imperial County | Imperial County | | | | 2017-06-08 |
| CIWQS 21597 | Imperial ID | | | | | 1900-01-01 |
| IID | Imperial Irrigation District | Imperial Irrigation District | | Imperial | | 2022-12-08 |
| IVILC | Imperial Valley Irrigated Lands Coalition | Imperial Valley Irrigated Lands Coalition | | El Centro | info@icfb.net | 2022-12-08 |
| CIWQS 21650 | Indian Springs School District | | | | | 1900-01-01 |
| IEc | Industrial Economics, Inc | Industrial Economics, Inc | Mindaugas Sereiva | Cambridge | msereiva@indecon.com | 2015-01-28 |
| IMTL | Industrial Marine Testing Lab, Inc. | Industrial Marine Testing Lab, Inc. | | | | 2017-06-05 |
| CIWQS 147335 | Inland Empire Utilities Agency | | | | | 1900-01-01 |
| ICARE | Institute for Conservation, Advocacy, Research, and Education (ICARE) | Institute for Conservation, Advocacy, Research, and Education (ICARE) | Chris Malan | Napa | | 2017-05-17 |
| Integral | Integral Consulting Inc. | Integral Consulting Inc. | | Seattle | | 2019-05-02 |
| IERS | Integrated Environmental Restoration Services | Integrated Environmental Restoration Services | | | | 2010-02-11 |
| ITIS | Integrated Taxonomic Information System | Integrated Taxonomic Information System | | | | 2013-05-13 |
| InyoCounty | Inyo County | Inyo County | | | | 2017-06-08 |
| ICEHD | Inyo County Environmental Health Department | | | | | 2023-11-01 |
| ICEHS | Inyo County Environmental Health Services Water Lab | Inyo County Environmental Health Services Water Lab | | | | 2019-04-03 |
| CIWQS 21868 | Ironhouse Sanitary District | | | | | 1900-01-01 |
| CIWQS 499770 | Irvine Ranch Water District | | | | | 1900-01-01 |
| CIWQS 21509 | I'SOT Inc | | | | | 1900-01-01 |
| ITCORP | IT Corporation Lab | IT Corporation Lab | | | | 2017-06-05 |
| CIWQS 22475 | J.F. Enterprises | | | | | 1900-01-01 |
| CIWQS 22556 | Jackson City | | | | | 1900-01-01 |
| JACOBS | Jacobs Lab | Jacobs Lab | | | | 2017-06-05 |
| JMMCE | James M. Montgomery, Consulting Engineers, Inc., Lab | James M. Montgomery, Consulting Engineers, Inc., Lab | | | | 2017-06-05 |
| JPL | Jet Propulsion Laboratory | Jet Propulsion Laboratory | | | | 2013-04-03 |
| CIWQS 358762 | JF Shea Company Inc | | | | | 1900-01-01 |
| JLAS | JL Analytical Services, Inc. | JL Analytical Services, Inc. | | | | 2017-06-05 |
| JLHA | John L Hunter and Associates | John L Hunter and Associates | Michelle Kim | Buena Park | mkim@jha.net | 2016-06-03 |
| JLC | Jon Lee Consulting | Jon Lee Consulting | Jon Lee | Eureka | jlee@humboldt1.com | 2016-12-21 |
| JLLCV | June Lake Loop Citizen Volunteers | Volunteer group that collects Harmful Algal Bloom samples around the June Lake Loop | | | | 2023-07-12 |
| Karuk-Tribe | Karuk Tribe | Karuk Tribe | Susan Fricke | Orleans | sfricke@karuk.us | 2017-03-16 |
| KBWQA | Kaweah Basin Water Quality Association | Kaweah Basin Water Quality Association | Donald Ikemiya | Visalia | dikemiya@ppeng.com | 2014-07-09 |
| Kaweah SW | Kaweah River Sub-Watershed | Kaweah River Sub-Watershed of the Southern San Joaquin Water Quality Coalition, ILRP | | | | 2011-03-24 |
| KTB | Keep Taho Blue | Keep Tahoe Blue | | South Lake Tahoe | | 2018-05-03 |
| KJC | Kennedy/Jenks/Chilton | Kennedy/Jenks/Chilton | | | | 2017-06-05 |
| KernCounty | Kern County | Kern County | | | | 2017-06-08 |
| KCDPH | Kern County Dept of Public Health | Kern County Dept of Public Health | | | | 2017-06-05 |
| KCWA-WQL | Kern County Water Agency, Water Quality Laboratory | Kern County Water Agency, Water Quality Laboratory | | | | 2017-06-05 |
| Kern SW | Kern River Sub-Watershed | Kern River Sub-Watershed of the Southern San Joaquin Water Quality Coalition, ILRP | | | | 2011-03-24 |
| KERNRWCA | Kern River Watershed Coalition Authority | Kern River Watershed Coalition Authority | Nicole Bell | Bakersfield | admin@krwca.org | 2014-07-09 |
| KIFF | KIFF Analytical | KIFF Analytical | | Davis | | 2011-11-28 |
| CIWQS 24287 | Kinder Morgan Energy Partners LP | | | | | 1900-01-01 |
| KCEL | King County Environmental Laboratory | King County Environmental Laboratory | | | | 2017-05-23 |
| KingsCounty | Kings County | Kings County | | | | 2017-06-08 |
| KRCD | Kings River Conservation District | Kings River Conservation District | | Fresno | | 2008-01-01 |
| Kings SW | Kings River Sub-Watershed | Kings River Sub-Watershed of the Southern San Joaquin Water Quality Coalition, ILRP | | | | 2011-03-24 |
| KINGSRWCA | Kings River Watershed Coalition Authority | Kings River Watershed Coalition Authority | Eric Athorp | Fresno | eathorp@krcd.org | 2014-07-09 |
| KEI | Kinnetic Environmental, Inc. | Kinnetic Environmental, Inc. (formally Kinnetic Laboratories, Inc.) | | | | 2023-04-10 |
| Kinnetic | Kinnetic Laboratories, Inc. | So Cal Region Office of Kinnetic Labs, Inc | Robert Shelquist, Reg. Manager | Carlsbad | rshelquist@kinneticlabs.com | 2012-05-31 |
| KLI-Santa Cruz | Kinnetic Laboratories, Inc. Santa Cruz Office | Kinnetic Laboratories, Inc. Santa Cruz Office | | | | 2012-11-05 |
| KBMP | Klamath Basin Monitoring Program | Klamath Basin Monitoring Program | Randy Turner | McKinleyville | randyt@sfei.org | 2016-10-14 |
| KBRT | Klamath Basin Rangeland Trust | Klamath Basin Rangeland Trust | Carolyn Doehring | Klamath Falls | cdoehring@kbrt.org | 2012-04-20 |
| Klamath-Tribes | Klamath Tribes | Klamath Tribes | Kris Fischer | Chiloquin | fischerkris@msn.com | 2012-04-20 |
| KTNRD | Klamath Tribes Natural Resource Department | Klamath Tribes natural Resource Department | Chantell Royer-Krider | | mpc@kbmp.net | 2013-05-20 |
| KWP | Klamath Watershed Partnership | Klamath Watershed Partnership | Nathan Jackson | Klamath Falls | njackson@klamathpartnership.org | 2012-04-20 |
| Kleinfelder | Kleinfelder | Kleinfelder - consultant | | Sacramento | | 2009-09-24 |
| CIWQS 24377 | Klondike California Mining Corp | | | | | 1900-01-01 |
| KPI | KPrime, Inc. | KPrime, Inc. | | Santa Rosa | | 2019-09-26 |
| LMCity | La Mesa City | La Mesa City | | | | 2015-04-24 |
| LASAN | LA Sanitation and Environment | LA Sanitation and Environment, City of Los Angeles | | | | 2024-03-05 |
| LDSRF | Laguna de Santa Rosa Foundation | Laguna de Santa Rosa Foundation | Hattie Brown | Santa Rosa | hattie@lagunafoundation.org | 2012-08-30 |
| LEL | Laguna Environmental Laboratory | Laguna Environmental Laboratory - Santa Rosa City Water Dept | | Santa Rosa | | 2017-09-05 |
| LAKEARROWHEAD | Lake Arrowhead Community Services District | Lake Arrowhead Community Services District | | | | 2017-06-05 |
| LakeCounty | Lake County | Lake County | | | | 2017-06-08 |
| LCWRD | Lake County Water Resources Department | Lake County Water Resources Department | | | | 2011-06-27 |
| LEC | Lake Elsinor City | Lake Elsinor City | | | | 2019-07-26 |
| LESJWA | Lake Elsinore and San Jacinto Watershed Authority | Lake Elsinore and San Jacinto Watershed Authority | Rich Whetsel | Riverside | | 2017-04-14 |
| LMI | Lake Merritt Institute | The Lake Merritt Institute is 501-C-3, non-profit charity, founded in 1992. They focus on Lake Merritt clean-up, education, and environmental health. | | Oakland | | 2019-02-20 |
| Laragen | Laragen Sequencing, Inc. | DNA Sequencing and Genotyping Laboratory | | Culver City | info@laragen.com | 2019-08-30 |
| LWA | Larry Walker Associates | Larry Walker Associates | Michael Marson | Ventura | michaelm@lwa.com | 2012-05-22 |
| CIWQS 25562 | Las Gallinas Valley Sanitary District | | | | | 1900-01-01 |
| LVMWD | Las Virgenes Muncipal Water District | Las Virgenes Muncipal Water District | | | | 2018-09-22 |
| CIWQS 26657 | Las Virgenes MWD | | | | | 1900-01-01 |
| LassenCounty | Lassen County | Lassen County | | | | 2017-06-08 |
| LLNL | Lawrence Livermore National Laboratory | Lawrence Livermore National Laboratory | | | | 2017-06-05 |
| LTSLT | League to Save Lake Tahoe | League to Save Lake Tahoe, Non-profit | Emily Frey | South Lake Tahoe | emily@keeptahoeblue.org | 2020-11-16 |
| LEERO | Lee & Ro Environmental Laboratories | Lee & Ro Environmental Laboratories | | | | 2017-06-05 |
| LCCC | Lehigh Cement Co Cupertino | Lehigh Cement Co Cupertino | | | | 2021-03-03 |
| CIWQS 25746 | Lehigh Southwest Cement Co Redding | | | | | 1900-01-01 |
| LGCity | Lemon Grove City | Lemon Grove City | | | | 2015-07-06 |
| LFE | LFE Environmental Analysis Lab | LFE Environmental Analysis Lab | | | | 2017-06-05 |
| CIWQS 25963 | Lincoln Center Env Remed Trust | | | | | 1900-01-01 |
| CIWQS 25974 | Lincoln City | | | | | 1900-01-01 |
| CIWQS 25978 | Linda Cnty Water District | | | | | 1900-01-01 |
| CIWQS 26056 | Live Oak City | | | | | 1900-01-01 |
| CIWQS 11100 | Lodi City | | | | | 1900-01-01 |
| CIWQS 26133 | Loleta CSD | | | | | 1900-01-01 |
| CIWQS 26142 | Lompoc City | | | | | 1900-01-01 |
| LCWTP | Lompoc City Water Treatment Plant | Lompoc City Water Treatment Plant | | | | 2017-06-28 |
| LongBeachCity | Long Beach City | City of Long Beach | | | | 2016-02-23 |
| LBCSMD | Long Beach City Stormwater Management Division | City of Long Beach Stormwater Management Division, a division of Long Beach Public Works | Anthony Arevalo | Long Beach | anthony.arevalo@longbeach.gov | 2015-12-03 |
| LBCWTD | Long Beach City Water Treatment Department | Long Beach City Water Treatment Department | | | | 2017-06-28 |
| CIWQS 27069 | Long Beach Generation LLC | | | | | 1900-01-01 |
| CIWQS 25146 | Los Angeles City Bureau of Sanitation | | | | | 1900-01-01 |
| LACityDWP | Los Angeles City Dept of Water and Power Environmental Lab | Los Angeles City Dept of Water and Power Environmental Lab | | | | 2017-06-05 |
| CIWQS 25175 | Los Angeles Cnty SD | | | | | 1900-01-01 |
| LosAngelesCounty | Los Angeles County | Los Angeles County | | | | 2017-06-08 |
| LACDBH | Los Angeles County Department of Beaches and Harbors | Los Angeles County Department of Beaches and Harbors | | | | 2013-04-03 |
| DH | Los Angeles County Department of Health Services | Los Angeles County Department of Health Services | Malay Trivedi | Baldwin Park | | 2012-05-07 |
| LACDPW | Los Angeles County Department of Power and Water | Los Angeles County Department of Power and Water | | | | 2013-10-29 |
| LACDPW-WMD | Los Angeles County Department of Public Works | Los Angeles County Department of Public Works - Watershed Management Division | | Alhambra | | 2016-07-28 |
| LACEH | Los Angeles County Environmental Health | Los Angeles County Environmental Health | Becky Valenti | Baldwin Park | | 2012-05-07 |
| LACETL | Los Angeles County Environmental Toxicology Laboratory | Los Angeles County Environmental Toxicology Laboratory | | | | 2017-06-05 |
| LACSD | Los Angeles County Sanitation Districts | Los Angeles County Sanitation Districts | Kathy | Whittier | | 2012-05-07 |
| LMU | Loyola Marymount University | Loyola Marymount University | | | | 2012-05-16 |
| LSCE | Luhdorff & Scalmanini, Consulting Engineers | Luhdorff & Scalmanini, Consulting Engineers | | Woodland | | 2022-06-16 |
| LU_FL | LuminUltra, Florida | LuminUltra, Florida | | Miami Lakes | | 2022-09-01 |
| Lunkefer | Lunkefer | Shasta sampler need update | | | | 2012-03-29 |
| MACS | MACS Lab, Inc. | MACS Lab, Inc. | | | | 2017-06-05 |
| MaderaCounty | Madera County | Madera County | | | | 2017-06-08 |
| CIWQS 44013 | Magic Mountain, LLC (Former Six Flags Theme Parks, Inc) | | | | | 1900-01-01 |
| CIWQS 27641 | Malaga CWD | | | | | 1900-01-01 |
| MalC | Malibu City | City of Malibu | Jennifer Brown | Malibu | jbrown@malibucity.org | 2014-04-22 |
| CIWQS 27706 | Manteca City | | | | | 1900-01-01 |
| MarinCounty | Marin County | Marin County | | | | 2017-06-08 |
| MCSTOPPP | Marin County Stormwater Pollution Prevention Program | NPDES stormwater permittee for Marin County | | | | 2016-08-18 |
| MMWD | Marin Municipal Water District | Marin Municipal Water District | | | | 2017-06-05 |
| MCWDL | Marina Coast Water District Laboratory | Marina Coast Water District Laboratory | | | | 2017-06-05 |
| MCCP | Marine Corps Base Camp Pendleton | Marine Corps Base Camp Pendleton | Unknown | Camp Pendelton | | 2012-05-07 |
| MMC | Marine Mammal Center | Marine Mammal Center | Denise Greig | Sausalito | | 2014-10-30 |
| MMVM | Marine Microbiology and Vector Management | Marine Microbiology and Vector Management | | | | 2016-06-10 |
| MPSL-DFW | Marine Pollution Studies Laboratory-DFW | Marine Pollution Studies Laboratory-DFW | Wesley Heim | Moss Landing | wheim@mlml.calstate.edu | 2018-02-12 |
| MPSL-MLML | Marine Pollution Studies Laboratory-MLML | Marine Pollution Studies Laboratory-MLML | Rusty Fairey | Moss Landing | fairey@mlml.calstate.edu | 2007-09-01 |
| MARRESSPEC | Marine Research Specialists | Marine Research Specialists | | Ventura | | 2017-06-05 |
| MTS | Marine Taxonomic Services | Marine Taxonomic Services | | | | 2022-10-12 |
| MariposaCounty | Mariposa County | Mariposa County | | | | 2017-06-08 |
| CIWQS 27814 | MARIPOSA PUD | | | | | 1900-01-01 |
| MTH | Mark Twain Hospital | Mark Twain Hospital | | | | 2017-06-05 |
| MCWTP | Martinez City Water Treatment Plant | Martinez City Water Treatment Plant | | | | 2017-06-05 |
| MAL | Maxxam Analytics | Maxxam Analytics Laboratories | | Mississauga | | 2014-07-15 |
| MBC | MBC Aquatic Sciences | MBC Aquatic Sciences | | | | 2019-04-02 |
| CIWQS 28203 | McCabe USD | | | | | 1900-01-01 |
| MCA | McCampbell Analytical Inc. | McCampbell Analytical Inc. | | Pittsburg | | 2011-09-09 |
| MEI | McCord Environmental, Inc. | McCord Environmental, Inc. based in Davis, CA | Stephen McCord | Davis | sam@mccenv.com | 2017-09-15 |
| MSLI | McDonald-Stevens Lab Inc. | McDonald-Stevens Lab Inc. | | | | 2017-06-05 |
| MESL | McKesson Environmental Service Lab | McKesson Environmental Service Lab | | | | 2017-06-05 |
| CIWQS 28265 | McKinleyville CSD | | | | | 1900-01-01 |
| MHEEC | McLaren/Hart Environmental Engineering Corporation | McLaren/Hart Environmental Engineering Corporation | | | | 2017-06-05 |
| MEC | MEC Analytical Systems | MEC Analytical Systems | Susie Watts | Carlsbad | Susie.Watts@WestonSolutions.com | 2007-09-01 |
| Medallion | Medallion Labs | Medallion Labs | | Minneapolis | info@medlabs.com | 2014-11-04 |
| MendocinoCounty | Mendocino County | Mendocino County | | | | 2017-06-08 |
| CIWQS 28505 | Merced City | | | | | 1900-01-01 |
| MCWWL | Merced City WasteWater Laboratory | Merced City WasteWater Laboratory | | | | 2017-06-28 |
| MercedCounty | Merced County | Merced County | | | | 2017-06-08 |
| MERID | Merced Irrigation District | Merced Irrigation District | Hicham ElTal | Merced | | 2009-09-24 |
| CIWQS 28528 | Meridian Gold Company | | | | | 1900-01-01 |
| MERKELINC | Merkel and Associates Inc | Enviromental Services Firm | Amanda K. Gonzales | San Diego | agonzales@merkelinc.com | 2021-01-29 |
| MWDSC | Metropolitan Water District of Southern California | Metropolitan Water District of Southern California | | | | 2017-06-05 |
| MLJ-LLC | Michael L. Johnson, LLC | Michael L. Johnson, LLC | Michael Johnson | Davis | mjohnson@mlj-llc.com | 2007-09-01 |
| Michelson | Michelson Laboratories, Inc | Michelson Laboratories, Inc | | | | 2011-10-07 |
| Microbac-Arcata | Microbac Laboratories Arcata | Microbac Laboratories Arcata | | Arcata | Roxanne.Golich@microbac.com | 2024-03-13 |
| MKGSA | Mid-Kaweah Groundwater Sustainability Agency | Mid-Kaweah Groundwater Sustainability Agency | | | | 2022-11-11 |
| MIDWAY | Midway Laboratory Inc. | Midway Laboratory Inc. | | | | 2017-06-05 |
| MOE | Mikhail Ogawa Engineering | Mikhail Ogawa Engineering | Mikhail Ogawa | Del Mar | | 2020-01-14 |
| CIWQS 28870 | Mining Remedial Recovery Co | | | | | 1900-01-01 |
| MISSION | Mission Laboratory, Gilroy | Mission Laboratory, Gilroy | | | | 2017-06-05 |
| MLJEnvironmental | MLJ Environmental | MLJ Environmental, Davis | Melissa Turner | Davis | mturner@mljenvironmental.com | 2018-10-11 |
| CIWQS 29046 | Modesto City | | | | | 1900-01-01 |
| MODCSP | Modesto City Stormwater Program | City of Modesto, Stormwater Program | | | | 2024-02-16 |
| MCU | Modesto City Utilities | City of Modesto, Utilities | David Felix | Modesto | dfelix@modestogov.com | 2016-03-30 |
| MCWQCL | Modesto City Water Quality Control Laboratory | Modesto City Water Quality Control Laboratory | | | | 2017-06-28 |
| MODID | Modesto Irrigation District | Modesto Irrigation District | Walter Ward | Modesto | | 2009-09-24 |
| ModocCounty | Modoc County | Modoc County | | | | 2017-06-08 |
| CIWQS 29055 | Modoc Joint Unified School District | | | | | 1900-01-01 |
| ModocRCD | Modoc Resource Conservation District | Modoc Resource Conservation District | | | | 2020-01-10 |
| MONARCH | Monarch Laboratory Inc., Chico | Monarch Laboratory Inc., Chico | | | | 2017-06-05 |
| MBAS | Monterey Bay Analytical Services | Monterey Bay Analytical Services | David Holland | Monterey | | 2013-01-04 |
| MBARI | Monterey Bay Aquarium Research Institute | Monterey Bay Aquarium Research Institute | | | | 2017-09-15 |
| MBARI-JL | Monterey Bay Aquarium Research Institute; Marine Chemistry Department Johnson Laboratory | Monterey Bay Aquarium Research Institute; Marine Chemistry Department Johnson Laboratory | Ken Johnson | Moss Landing | johnson@mbari.org | 2013-09-26 |
| MBNMS | Monterey Bay National Marine Sanctuary | Monterey Bay National Marine Sanctuary | Bridget Hoover | Monterey | Bridget.Hoover@noaa.gov | 2014-06-09 |
| MontereyCounty | Monterey County | Monterey County | | | | 2017-06-08 |
| MRWPCA | Monterey Regional Water Pollution Control Agency | Monterey Regional Water Pollution Control Agency | | | | 2016-03-18 |
| MTA | Moore Twining Associates, Inc. | Moore Twining Associates, Inc. | Maria Manuel | Fresno | mariam@mooretwining.com | 2012-09-13 |
| MBNEP | Morro Bay National Estuary Program | Morro Bay National Estuary Program | Thomas Stanford | | | 2013-12-19 |
| MBOC | Morro Bay Oyster Company | Privately-owned oyster farm | Neal Maloney | Morro Bay | neal@morrobayoysters.com | 2015-06-02 |
| MORSE | Morse Laboratories, Sacramento | Morse Laboratories, Sacramento | | | | 2017-06-05 |
| MLML_Oakden | Moss Landing Marine Laboratories - Oakden Lab | Moss Landing Marine Laboratories - Oakden Lab | Jim Oakden | Moss Landing | oakden@mlml.calstate.edu | 2012-08-30 |
| MLML-Coale | Moss Landing Marine Laboratories Coale Lab | Moss Landing Marine Laboratories Dr. Kenneth Coale's Laboratory | Dr. Kenneth Coale | Moss Landing | Coale@mlml.calstate.edu | 2012-10-05 |
| MLML-RDC | Moss Landing Marine Laboratories Regional Data Center | Moss Landing Marine Laboratories Regional Data Center | Mark Pranger | Moss Landing | pranger@mlml.calstate.edu | 2012-04-20 |
| MLML-BL | Moss Landing Marine Laboratories-Benthic Lab | Moss Landing Marine Laboratories-Benthic Lab | Peter Slattery | Moss Landing | pslattery@mlml.calstate.edu | 2007-09-01 |
| MLML-CO | Moss Landing Marine Laboratories-CO | Moss Landing Marine Laboratories-CO | Dr. Kenneth Cole | Moss Landing | | 2012-10-05 |
| MLML-GeoOc | Moss Landing Marine Laboratories-Geological Oceanography | Moss Landing Marine Laboratories-Geological Oceanography | Ivano W. Aiello | Moss Landing | iaiello@mlml.calstate.edu | 2012-08-30 |
| MLML-TM | Moss Landing Marine Laboratories-Trace Metals Lab | Moss Landing Marine Laboratories-Trace Metals Lab | Sara Tanner | Moss Landing | tanner@mlml.calstate.edu | 2007-09-01 |
| CIWQS 29366 | Mountain House CSD | | | | | 1900-01-01 |
| MRCA | Mountains Recreation and Conservation Authority | | Ana Straabe | Los Angeles | ana.straabe@mrca.ca.gov | 2018-06-26 |
| MRT | Mountains Restoration Trust | Mountains Restoration Trust | Kyle Troy | Calabasas | ktroy@mountainstrust.org | 2014-06-03 |
| CIWQS 29441 | Mt Lassen Trout Farms Inc | | | | | 1900-01-01 |
| CIWQS 29446 | Mt Shasta City | | | | | 1900-01-01 |
| CIWQS 29450 | MT. VIEW SANITARY DISTRICT | | | | | 1900-01-01 |
| MULTITECH | Multi-Tech, Inc., Lab | Multi-Tech, Inc., Lab | | | | 2017-06-05 |
| MC | Murrieta City | City of Murrieta | | Murrieta | | 2018-01-30 |
| MWH | MWH Laboratories | MWH Laboratories | James C. Hein | Monrovia | mwhlabs@mwhglobal.com | 2007-09-01 |
| NAL | Nachtmann Analytical Laboratory, Davis | Nachtmann Analytical Laboratory, Davis | | | | 2017-06-05 |
| NapaCounty | Napa County | Napa County | | | | 2017-06-08 |
| NAPARCD | Napa County Resource Conservation District | Resource Conservation District- Napa county | | Napa | | 2009-10-14 |
| CIWQS 31164 | NAPA SANITATION DISTRICT | | | | | 1900-01-01 |
| NAMC | National Aquatic Monitoring Center | | Trip Armstrong | Logan | | 2023-02-16 |
| NCCity | National City | National City | | | | 2015-04-24 |
| NOAA | National Oceanic and Atmospheric Administration | The National Oceanic and Atmospheric Administration | | Washington | | 2012-08-30 |
| NAUT | Nautilus Environmental | Nautilus Environmental | Steve Carlson | San Diego | stevec@nautilusenvironmental.com | 2007-09-01 |
| NIWC_Pacific | Naval Information Warfare Center Pacific??????????? | Naval Information Warfare Center Pacific??????????? | | | | 2022-04-14 |
| NELL | NEL Laboratories | NEL Laboratories | Doug McCormack | Reno | dmccormack@nelabs.com | 2007-09-01 |
| NELSON | Nelson Lab | Nelson Lab | | | | 2017-06-05 |
| NWQAL | Nestle Waters Quality Assurance Laboratory | Nestle Waters Quality Assurance Laboratory | | | | 2017-06-05 |
| NETPACIFIC | Net Pacific, Inc. | Net Pacific, Inc. | | | | 2017-06-05 |
| CIWQS 31378 | Nevada City | | | | | 1900-01-01 |
| NevadaCounty | Nevada County | Nevada County | | | | 2017-06-08 |
| CIWQS 31380 | Nevada CSD No 1 | | | | | 1900-01-01 |
| NDEP | Nevada Division of Environmental Protection | Nevada Division of Environmental Protection | Marianne Denton | Carson | dentonm@ndep.nv.gov | 2015-02-18 |
| NIDNAWTP | Nevada Irrigation District North Auburn Water Treatment Plant | Nevada Irrigation District North Auburn Water Treatment Plant | | | | 2017-06-05 |
| NTCD | Nevada Tahoe Conservation District | Nevada Tahoe Conservation District | Meghan Kelly | Zephyr Cove | info@ntcd.org | 2018-12-03 |
| CIWQS 31394 | NEW CENTURY BEVERAGE COMPANY | | | | | 1900-01-01 |
| NewFields | NewFields | NewFields | | | | 2020-10-22 |
| NL&FC | Newhall Land and Farming Company | Newhall Land and Farming Company | | | | 2016-12-23 |
| CIWQS 400869 | Newhall Ranch Sanitation District | | | | | 1900-01-01 |
| CIWQS 31531 | Niland SD | | | | | 1900-01-01 |
| NOAACHHR | NOAA Center for Human Health Risk | NOAA Center for Human Health Risk | | | | 2012-05-07 |
| NOAACOAST | NOAA Coastal Oceanographic Assessment Status and Trends | The Coastal and Oceanographic Assessment, Status and Trends (COAST) Branch is part of NOAA's National Centers for Coastal Ocean Science in the Center for Coastal Monitoring and Assessment (CCMA), located in Silver Spring, Maryland, USA. | Gunnar Lauenstein, Ph.D. | Silver Spring | | 2012-05-07 |
| NBRWTP | North Bay Regional Water Treatment Plant | North Bay Regional Water Treatment Plant | | | | 2017-06-05 |
| NCCWDL | North Coast County Water District Lab | North Coast County Water District Lab | | | | 2017-06-05 |
| NMWD | North Marin Water District | North Marin Water District | | | | 2017-06-05 |
| NSDCWMP | North San Diego County Watershed Monitoring Program | A program under Preserve Calavera to monitor, analyze and share water quality data of Carlsbad's 3 lagoon watersheds | | | | 2019-10-23 |
| CIWQS 31673 | North San Mateo County Sanitation District | | | | | 1900-01-01 |
| NSR | North State Resources, Inc. | North State Resources, Inc. | Len Lindstrand III | Redding | lindstrand@nsrnet.com | 2015-04-09 |
| NEC | Northcoast Environment Center | Non-profit environmental organization dedicated to protecting the environment in the North Coast | | | | 2022-11-02 |
| NECWA | Northeastern California Water Association | Northeastern California Water Association | Helen Albaugh | McArthur | halbaugh@hdo.net | 2009-12-22 |
| NAU | Northern Arizona University | Northern Arizona University | Dean Blinn | | dean.blinn@nau.edu | 2007-09-01 |
| NCNRCD | Northern California-Nevada Resource Conservation District | Northern California-Nevada Resource Conservation District | Todd Sloat | | tsloat@citlink.net | 2007-09-01 |
| NGEM | Northgate Environmental Management, Inc. | Northgate Environmental Management, Inc. | Dana R. Brown | Laguna | dana.brown@ngem.com | 2016-06-03 |
| CIWQS 46428 | Northrop Grumman Systems Corporation | | | | | 1900-01-01 |
| NorthStar | NorthStar Engineering | NorthStar Engineering | | | | 2019-01-02 |
| NV5_Long Beach | NV5 Long Beach Office | NV5 Long Beach Office | Jacqueline McMillen | Long Beach | jacqueline.mcmillen@nv5.com | 2021-04-21 |
| NV5_Oceanside | NV5 Oceanside Office | NV5 Oceanside Office | Garth Engelhorn | Oceanside | garth.engelhorn@nv5.com | 2020-07-03 |
| OID | Oakdale Irrigation District | Oakdale Irrigation District | | Oakdale | | 2010-12-03 |
| OAMG | Ocean Acidification Monitoring Group | Consortium of ocean researchers. | | | | 1900-01-01 |
| OCWUL | Oceanside City Water Utility Laboratory | Oceanside City Water Utility Laboratory | | | | 2017-06-28 |
| OEC | Oilfield and Environmental Compliance | Oilfield and Environmental Compliance | | Santa Maria | | 2017-05-09 |
| ORL | Oilwell Research Lab | Oilwell Research Lab | | | | 2017-06-05 |
| CIWQS 33028 | Ojai Valley Sanitary District | | | | | 1900-01-01 |
| CIWQS 32551 | Olivehurst PUD | | | | | 1900-01-01 |
| OCWD | Orange City Water Department | Orange City Water Department | | | | 2017-06-05 |
| OCA | Orange Coast Analytical, Inc. | Orange Coast Analytical, Inc. | | | | 2019-06-10 |
| OC | Orange County | Orange County | Charlie McGee | Fountain Valley | | 2012-05-07 |
| OCEHD | Orange County Environmental Health Division | Orange County Environmental Health Division | Michael Fennessy | Santa Ana | | 2012-05-07 |
| OCPHL | Orange County Public Health Lab | Orange County Public Health Lab | | | | 2012-05-07 |
| OCPW | Orange County Public Works | Orange County Public Works | | | | 2013-10-29 |
| OCSD | Orange County Sanitation District | Orange County Sanitation District | | | | 2012-05-07 |
| OCWR | Orange County Waste and Recycling | Orange County Waste and Recycling | | | | 2021-01-14 |
| OCWDML | Orange County Water District Main Laboratory | Orange County Water District Main Laboratory | | | | 2017-06-05 |
| ODEQ | Oregon Department of Environmental Quality | Oregon Department of Environmental Quality | Steve Kirk | Portland | KIM.Won@deq.state.or.us | 2012-04-20 |
| ODEQ-KFALLS | Oregon Department of Environmental Quality, Klamath Falls | Oregon Department of Environmental Quality, Klamath Falls | Mike Hiatt | Klamath Falls | hiatt.mike@deq.state.or.us | 2016-09-12 |
| OSU-Zoo | Oregon State University, Department of Zoology | Oregon State University, Department of Zoology | Dave Lytle | Corvallis | | 2015-04-16 |
| OXN_PW | Oxnard City, Department of Public Works | Oxnard City, Department of Public Works | | | | 2023-10-30 |
| PACE | Pace Analytical Service, Inc. | Pace Analytical Service, Inc. | Unknown | Minneapolis | | 2012-05-07 |
| PACE_Camarillo | Pace Analytical Services, Inc., Camarillo | Pace Analytical Services, Inc., Camarillo | | | | 2017-06-05 |
| PAI | Pacific Analytical Inc. | Pacific Analytical Inc. | | | | 2017-06-05 |
| PCAS | Pacific Coast Analytical Services | Pacific Coast Analytical Services | | | | 2010-10-15 |
| PER | Pacific Ecorisk | Pacific Ecorisk | Stephen Clark | Martinez | | 2007-09-01 |
| PEL | Pacific Environmental Laboratory | Pacific Environmental Laboratory | | | | 2017-06-05 |
| CIWQS 33523 | Pacific Gas & Electric Company Eureka | | | | | 1900-01-01 |
| PGE-San Ramon | Pacific Gas and Electric San Ramon | Pacific Gas and Electric San Ramon - Aquatic and Natural Resources | Catalina Reyes | San Ramon | | 2017-12-01 |
| PACRL | Pacific Ridgeline | Pacific Ridgeline | Bryn Home | Ventura | bryn@pacrl.com | 2021-06-25 |
| CIWQS 33649 | Pacifica City | | | | | 1900-01-01 |
| PacifiCorp | PacifiCorp | PacifiCorp | Linda Prendergast | Portland | linda.prendergast@pacificorp.com | 2017-03-16 |
| CIWQS 33676 | Pactiv Corp | | | | | 1900-01-01 |
| CIWQS 33680 | Padre Dam Municipal Water District | | | | | 1900-01-01 |
| CIWQS 33738 | Palo Alto City | | | | | 1900-01-01 |
| PARWQCL | Palo Alto Regional Water Quality Control Laboratory | Palo Alto Regional Water Quality Control Laboratory | | | | 2017-06-05 |
| PVPWMG | Palos Verdes Peninsula Watershed Management Group | This group consists of the following entities: City of Palos Verdes Estates, City of Rancho Palos Verdes, City of Rolling Hills, City of Rolling Hills Estates, County of Los Angeles, Los Angeles County Flood Control District | Andy Winje | Rancho Palos Verdes | andyw@rpvca.gov | 2016-06-03 |
| PDD | Panoche Drainage District | Panoche Drainage District | Mike Gardner | | mgpanoche@panochedd.org | 2007-09-01 |
| CIWQS 33785 | Paradise ID | | | | | 1900-01-01 |
| USLT_CSL_RCD | Partnernship between Upper Salinas-Las Tablas and Coastal San Luis Resource Conservation Districts | The US-LT and CSL RCDs are non-regulatory, not-for-profit organziations that provide technical assistance, education, and resources to help farmers, ranchers, and landowners protect their soil, water, and natural habitats. | | | | 2018-05-10 |
| PCWQL | Pasadena City Water Quality Laboratory | Pasadena City Water Quality Laboratory | | | | 2017-06-05 |
| CIWQS 33896 | Paso Robles City | | | | | 1900-01-01 |
| Pat-Chem | Pat-Chem Laboratories | Pat-Chem Laboratories | Theresa Treviso | Moorpark | | 2012-06-08 |
| PU | Pepperdine University | Pepperdine University | | | | 2018-09-22 |
| COP | Petaluma City Waste Water Treatment Facility | City of Petaluma waste water treatment facility and analytical laboratory | | | | 2016-08-18 |
| CIWQS 12244 | Peter M. Ormand | | | | | 1900-01-01 |
| CIWQS 9217 | Phillips 66 (formerly ConocoPhillips) - SF Refinery | | | | | 1900-01-01 |
| Phycotech | Phycotech, Inc. | Laboratory/Environmental Consulting | Ann St. Amand | St. Joseph | | 2019-03-14 |
| PHYSIS | PHYSIS Environmental Laboratories, Inc. | PHYSIS Environmental Laboratories, Inc. | Misty Mercier | Anaheim | | 2011-09-29 |
| PMWWFPL | Pittsburg Municipal Water Works Filtration Plant Laboratory | Pittsburg Municipal Water Works Filtration Plant Laboratory | | | | 2017-06-05 |
| CIWQS 181411 | Placer Cnty Dept of Facility Services | | | | | 1900-01-01 |
| PlacerCounty | Placer County | Placer County | | | | 2017-06-08 |
| CIWQS 34521 | Placerville City | | | | | 1900-01-01 |
| CIWQS 483625 | Plains West Coast Terminals, LLC | | | | | 1900-01-01 |
| CIWQS 34528 | PLANADA CSD | | | | | 1900-01-01 |
| PluCorp | Plumas Corporation | Plumas Corporation | | | | 2024-09-04 |
| PNSSNS | PNSSNS Subwatershed Group | Placer-Nevada-South Sutter-North Sacramento (PNSSNS) Subwatershed Group | Linda Watanabe | Lincoln | cleanwaters@netscape.com | 2012-06-07 |
| POLB | Port of Long Beach | Port of Long Beach | Dylan Porter | | dylan.porter.polb.com | 2018-03-01 |
| POSD | Port of San Diego | Port of San Diego | | | | 2012-05-16 |
| CIWQS 34722 | Portola City | | | | | 1900-01-01 |
| PowayCity | Poway City | City of Poway | | | | 2014-07-02 |
| PPCG | Provost & Pritchard Consulting Group | Provost & Pritchard Consulting Group | | Visalia | | 2017-08-16 |
| PTRL | PTRL West, Richmond | PTRL West, Richmond | | | | 2017-06-05 |
| PTS | PTS Laboratories | PTS Laboratories | | | | 2011-08-25 |
| PCWG | Putah Creek Watershed Group | Putah Creek Watershed Group | | | | 2015-06-11 |
| QALSD | Quality Assurance Laboratory of San Diego | Quality Assurance Laboratory of San Diego | | | | 2017-06-05 |
| QWL | Quality Water Laboratory | Quality Water Laboratory | | | | 2017-06-05 |
| QUANTERRA | Quanterra Lab | Quanterra Lab | | | | 2017-06-05 |
| QVIR | Quartz Valley Indian Reservation | Quartz Valley Indian Reservation | Sarah Scheafer | Fort Jones | epadirector@qvir.com; epadirector@qvir.com | 2012-04-20 |
| CIWQS 36414 | Quincy Community Services District | | | | | 1900-01-01 |
| RFE_Rose | R&F Engineering, Roseville | R&F Engineering, Roseville | | | | 2023-03-15 |
| RLC | Radian Lab Corporation | Radian Lab Corporation | | | | 2017-06-05 |
| RDC | Radiation Detection Company | Radiation Detection Company | | | | 2017-06-05 |
| CIWQS 4573 | Ralph Beatty | | | | | 1900-01-01 |
| Ramboll | Ramboll Environ | Ramboll Environ | Bridget Gregg | Port Gamble | bgregg@ramboll.com | 2016-03-30 |
| REBWCL | Ray E. Beam Water Consultant Lab | Ray E. Beam Water Consultant Lab | | | | 2017-06-05 |
| CIWQS 36963 | Red Bluff City | | | | | 1900-01-01 |
| RedHills | Red Hills Environmental, LLC | Red Hills Environmental, LLC | | | | 2016-11-03 |
| CIWQS 37005 | Redding City | | | | | 1900-01-01 |
| RCWD | Redlands City Wastewater Division | Redlands City Wastewater Division | | | | 2017-06-05 |
| CIWQS 47658 | Regents of the University of California - UC Davis | | | | | 1900-01-01 |
| RESIGHINI | Resighini Racheria | Resighini Racheria | Rob Cozens | Klamath | ResighiniEPA@hughes.net | 2012-04-20 |
| RCDMC | Resource Conservation District of Monterey County | Resource Conservation District of Monterey County | | Salinas | | 2020-03-18 |
| Rhithron | Rhithron Associates, Inc. | Rhithron Associates, Inc. | | Missoula | contact@rhithron.com | 2015-12-11 |
| RPAGCO | Rhone-Poulenc Ag Company | Rhone-Poulenc Ag Company | | | | 2017-06-05 |
| CIWQS 37426 | Rio Alto WD | | | | | 1900-01-01 |
| CIWQS 37430 | Rio Dell City | | | | | 1900-01-01 |
| CIWQS 37437 | Rio Vista City | | | | | 1900-01-01 |
| CIWQS 37474 | River Highlands CSD | | | | | 1900-01-01 |
| CIWQS 502400 | Riverside City | | | | | 1900-01-01 |
| RiversideCounty | Riverside County | Riverside County | | | | 2017-06-08 |
| RCFC | Riverside County Flood Control | Riverside County Flood Control | Steven Clark | Riverside | seclark@rcflood.org | 2012-08-15 |
| RCSA51 | Riverside County Service Area 51 | Riverside County Service Area 51 | | | | 2017-06-05 |
| RWQCP | Riverside Water Quality Control Plant | Riverside Water Quality Control Plant | | | | 2017-04-21 |
| RCRCD | Riverside-Corona Resource Conservation District | Riverside-Corona Resource Conservation District | Kerwin Russell | Riverside | | 2019-06-13 |
| RJLG | RJ Lee Group, Inc. | RJ Lee Group, Inc. | | | | 2017-06-05 |
| RBI | Robertson-Bryan, Inc. | Robertson-Bryan, Inc. | | | | 2017-10-12 |
| CIWQS 37731 | Rockwell Automation | | | | | 1900-01-01 |
| RIRD | Rockwell International, Rocketdyne Division | Rockwell International, Rocketdyne Division | | | | 2017-06-05 |
| CIWQS 11142 | Roseville City | | | | | 1900-01-01 |
| RCWWCL | Roseville City WasteWater Control Laboratory | Roseville City WasteWater Control Laboratory | | | | 2017-06-28 |
| RWQCB1 | RWQCB1-North Coast Region | RWQCB1-North Coast Region | Rich Fadness | Santa Rosa | RFadness@waterboards.ca.gov | 2007-09-01 |
| RWQCB2 | RWQCB2-San Francisco Bay Region | RWQCB2-San Francisco Bay Region | Karen Taberski | Oakland | KTaberski@waterboards.ca.gov | 2011-03-28 |
| RWQCB3 | RWQCB3-Central Coast Region | RWQCB3-Central Coast Region | Karen Worcester | San Luis Obispo | Kworcester@waterboards.ca.gov | 2007-09-01 |
| RWQCB4 | RWQCB4-Los Angeles Region | RWQCB4-Los Angeles Region | Michael Lyons | Los Angeles | Mlyons@waterboards.ca.gov | 2007-09-01 |
| LACRWQCB-TMDL | RWQCB4-Los Angeles Region-TMDL | RWQCB4-Los Angeles Region-TMDL | Stephen Kiyoi | Los Angeles | | 2012-05-15 |
| RWQCB5 | RWQCB5-Central Valley Region | RWQCB5-Central Valley Region | Alisha Wenzel | Rancho Cordova | awenzel@waterboards.ca.gov | 2016-01-22 |
| RWQCB5F | RWQCB5-Central Valley Region (Fresno) | RWQCB5-Central Valley Region (Fresno) | Bethany Soto | Fresno | bsoto@waterboards.ca.gov | 2012-01-17 |
| RWQCB5L | RWQCB5-Central Valley Region (Lower Sacramento) | RWQCB5-Central Valley Region (Lower Sacramento) | Alisha Wenzel | Rancho Cordova | awenzel@waterboards.ca.gov | 2012-01-17 |
| RWQCB5R | RWQCB5-Central Valley Region (Redding) | RWQCB5-Central Valley Region (Redding) | Alisha Wenzel | Rancho Cordova | awenzel@waterboards.ca.gov | 2020-02-10 |
| RWQCB5S | RWQCB5-Central Valley Region (Sacramento) | RWQCB5-Central Valley Region (Sacramento) | Alisha Wenzel | Rancho Cordova | awenzel@waterboards.ca.gov | 2012-01-17 |
| RWQCB5U | RWQCB5-Central Valley Region (Upper Sacramento) | RWQCB5-Central Valley Region (Upper Sacramento) | Alisha Wenzel | Rancho Cordova | awenzel@waterboards.ca.gov | 2012-01-17 |
| RWQCB6 | RWQCB6-Lahontan Region | RWQCB6-Lahontan Region | Thomas Suk | South Lake Tahoe | TSuk@waterboards.ca.gov | 2007-09-01 |
| RWQCB7 | RWQCB7-Colorado River Basin Region | RWQCB7-Colorado River Basin Region | Jeff Geraci | Palm Desert | jgeraci@waterboards.ca.gov | 2012-01-17 |
| RWQCB8 | RWQCB8-Santa Ana Region | RWQCB8-Santa Ana Region | Pavlova Vitale | Riverside | hboyd@waterboards.ca.gov | 2012-01-17 |
| RWQCB9 | RWQCB9-San Diego Region | RWQCB9-San Diego Region | Lilian Busse | San Diego | lbusse@waterboards.ca.gov | 2012-01-17 |
| CIWQS 39410 | Sacramento City | | | | | 1900-01-01 |
| SCARWTP | Sacramento City American River Water Treatment Plant | Sacramento City American River Water Treatment Plant | | | | 2017-06-28 |
| CIWQS 39382 | Sacramento Cnty Solid Waste Management | | | | | 1900-01-01 |
| SacramentoCounty | Sacramento County | Sacramento County | | | | 2017-06-08 |
| SCEQCL | Sacramento County Environmental Quality Control Laboratory | Sacramento County Environmental Quality Control Laboratory | | | | 2017-06-28 |
| SMUD | Sacramento Municipal Utility District | Electricity Provider to Sacramento County | Tyler Belarde | Pollock Pines | tyler.belarde@smud.org | 2018-05-09 |
| SRCSD | Sacramento Regional County Sanitation District | Sacramento Regional County Sanitation District | | | | 2017-02-28 |
| CIWQS 39399 | Sacramento Regional CSD | | | | | 1900-01-01 |
| SRWTP | Sacramento Regional Wastewater Treatment Plant | Sacramento Regional Wastewater Treatment Plant | | Elk Grove | | 2016-06-06 |
| SRWP | Sacramento River Watershed Program | Sacramento River Watershed Program Monitoring for 2005-2007 | Holly Jorgensen | Chico | holly@sacriver.org | 2016-03-14 |
| SVWQC | Sacramento Valley Water Quality Coalition | Sacramento Valley Water Quality Coalition | Bruce Houdelsheldt, Donn Zea (NCWA) | Sacramento | bruceh@norcalwater.org | 2009-09-24 |
| SSJDC | Sacramento-San Joaquin Delta Conservancy | Sacramento-San Joaquin Delta Conservancy | Shakoora Azimi-Gaylon | West Sacramento | shakoora.azimi-gaylon@deltaconservancy.ca.gov | 2015-06-01 |
| SALCO | Salco Laboratory Services | Salco Laboratory Services | | | | 2017-06-05 |
| SRRC | Salmon River Restoration Council | Salmon River Restoration Council | Lyra Cressey | Sawyers Bar | lyra@srrc.org | 2012-04-20 |
| SRF | Salmonid Restoration Federation | Salmonid Restoration Federation | Katrina Nystrom | Eureka | katrina@calsalmon.org | 2022-02-04 |
| CIWQS 39539 | San Andreas SD | | | | | 1900-01-01 |
| SanBenitoCounty | San Benito County | San Benito County | | | | 2017-06-08 |
| SBC | San Bernardino County | San Bernardino County | Darryl Tafoya | San Bernardino | dtafoya@dpw.sbcounty.gov | 2012-05-07 |
| SBCFC | San Bernardino County Flood Control | San Bernardino County Flood Control | | | | 2017-06-28 |
| SBCP | San Bernardino County Parks | The Regional Parks Department manages and maintains ten Regional Parks throughout San Bernardino County totaling approximately 9,200 acres | | | | 2023-07-12 |
| SBCSL | San Buenaventura City Sanitation Laboratory, Ventura | San Buenaventura City Sanitation Laboratory, Ventura | | | | 2017-06-05 |
| SCCPW | San Clemente City Public Works | San Clemente City Public Works | | | | 2018-06-29 |
| SCWRP | San Clemente City Water Reclamation Plant | San Clemente City Water Reclamation Plant | | | | 2017-06-05 |
| SDAA | San Diego Airport Authority | San Diego Airport Authority | | | | 2015-07-06 |
| SDCity | San Diego City | City of San Diego | | | | 2023-12-08 |
| SDCPUD | San Diego City Public Utilities Department, La Mesa | San Diego City Public Utilities Department, La Mesa | | | | 2017-06-05 |
| SDCK | San Diego Coastkeeper | San Diego Coastkeeper | | San Diego | | 2023-10-20 |
| SDC | San Diego County | San Diego County | Steven DiDonna | San Diego | steven.didonna@sdcounty.ca.gov | 2012-05-07 |
| SDCDEH | San Diego County Department of Environmental Health | San Diego County Department of Environmental Health | Ewan Moffat | San Diego | | 2012-05-07 |
| SDCPHL | San Diego County Public Health Laboratory | San Diego County Public Health Laboratory | Brett Austin | San Diego | Brett.Austin@sdcounty.ca.gov | 2018-12-10 |
| SDRPF | San Diego River Park Foundation | San Diego River Park Foundation | | | | 2016-03-18 |
| CIWQS 39664 | San Elijo Joint Powers | | | | | 1900-01-01 |
| SEJPA | San Elijo Joint Powers Authority | San Elijo Joint Powers Authority | Unknown | Cardiff by the Sea | | 2012-05-07 |
| SELC | San Elijo Lagoon Conservancy | San Elijo Lagoon Conservancy | Bradley Nussbaum | Encinitas | bradley@sanelijo.org | 2014-03-06 |
| SanFranciscoCity | San Francisco City | San Francisco City | | | | 2017-06-08 |
| SanFranciscoCounty | San Francisco County | San Francisco County | | | | 2017-06-08 |
| SFDPH | San Francisco Department of Public Health | San Francisco Department of Public Health | Ned Shitara | San Francisco | | 2012-05-07 |
| SFEI | San Francisco Estuary Institute | San Francisco Estuary Institute | Cristina Grosso | Oakland | cristina@sfei.org | 2007-12-21 |
| SFIA | San Francisco International Airport | San Francisco International Airport | | | | 2017-06-05 |
| SFPUC-RSWPCP | San Francisco Public Utilities Commision, Richmond-Sunset Water Pollution Control Plant | San Francisco Public Utilities Commision, Richmond-Sunset Water Pollution Control Plant | | | | 2017-06-28 |
| SFPUC-STP | San Francisco Public Utilities Commision, Southeast Treatment Plant | San Francisco Public Utilities Commision, Southeast Treatment Plant | | | | 2017-06-28 |
| SFPUC-WDDNR | San Francisco Public Utilities Commission Water Department Division of Natural Resources | | | | | 2016-02-04 |
| SFSU-RTC | San Francisco State University - Romberg Tiburon Center | San Francisco State University - Romberg Tiburon Center | Al Marchi | Tiburon | amarchi@rtc.sfsu.edu | 2011-06-09 |
| SJDWQC | San Joaquin and Delta Water Quality Coaliton, ILRP | San Joaquin and Delta Water Quality Coaliton, ILRP | | | | 2017-06-08 |
| SanJoaquinCounty | San Joaquin County | San Joaquin County | | | | 2017-06-08 |
| SJVDA | San Joaquin Valley Drainage Authority | San Joaquin Valley Drainage Authority | | | | 2016-06-14 |
| SJSURF | San Jose State University Research Foundation | San Jose State University Research Foundation MPSL Operating Institution | | San Jose | | 2015-01-28 |
| SJSCRWF | San Jose-Santa Clara Regional Wastewater Facility | San Jose-Santa Clara Regional Wastewater Facility | | San Jose | | 2016-02-17 |
| SLDMWA | San Luis and Delta Mendota Water Authority | San Luis and Delta Mendota Water Authority | | | | 2019-06-17 |
| CIWQS 39771 | San Luis Obispo City | | | | | 1900-01-01 |
| SLOCWTP | San Luis Obispo City Water Treatment Plant | San Luis Obispo City Water Treatment Plant | | | | 2017-06-28 |
| SanLuisObispoCounty | San Luis Obispo County | San Luis Obispo County | | | | 2017-06-08 |
| SLOCPHDEH | San Luis Obispo County Public Health Department Environmental Health | San Luis Obispo County Public Health Department Environmental Health | Liberty Amanson | San Luis Obispo | | 2012-05-07 |
| SLOCPHDL | San Luis Obispo County Public Health Department Lab | San Luis Obispo County Public Health Department Lab | Dr. Jim Beebe | San Luis Obispo | | 2015-04-07 |
| SLODPW | San Luis Obispo County Public Works Department | San Luis Obispo County Public Works Department | Shane Bennett | San Luis Obispo | sdbennett@co.slo.ca.us | 2014-09-12 |
| SLO_City | San Luis Obispo, City of | City of San Luis Obispo | | | | 2024-08-28 |
| SLR | San Luis Rey Wastewater Department | San Luis Rey Wastewater Department | | | | 2016-06-10 |
| SLWD | San Luis Water District | San Luis Water District, ILRP | | Los Banos | youtellus@sldmwa.org | 2016-12-11 |
| SMBOMI | San Manuel Band Of Mission Indians | San Manuel Band Of Mission Indians | | | | 2017-06-05 |
| SanMarcosCity | San Marcos City | City of San Marcos | | | | 2014-07-02 |
| CIWQS 39800 | San Mateo City | City of San Mateo | | | waterboard@cityofsanmateo.org | 2018-01-30 |
| SanMateoCounty | San Mateo County | San Mateo County | | | | 2017-06-08 |
| SMCL | San Mateo County - Public Health Lab | San Mateo County - Public Health Lab | Craig Blackmore | San Mateo | cblackmore@smcgov.org | 2012-08-30 |
| SMCRCD | San Mateo County Resource Conservation District | San Mateo County Resource Conservation District | Kellyx Nelson | Half Moon Bay | Kellyx@sanmateorcd.org | 2014-04-10 |
| SMCWPPP | San Mateo Countyside Water Pollution Prevention Program | San Mateo Countyside Water Pollution Prevention Program | Lucy Buchan | | buchan@eoainc.com | 2012-08-30 |
| SO | San Onofre Generating Station | San Onofre Generating Station | | | | 2012-05-07 |
| SPAWNERS | San Pablo Watershed Neighbors Education and Restoration Society | The San Pablo Watershed Neighbors Education and Restoration Society | Helen Fitanides | Richmond | helen@thewatershedproject.org | 2016-11-15 |
| SFI | Sanctuary Forest, Inc. | Sanctuary Forest, Inc. | | | | 2021-11-12 |
| SOCI | Sanitation And Operation Consultants, Inc. | Sanitation And Operation Consultants, Inc. | | | | 2017-06-05 |
| SAC | Santa Ana City | Santa Ana City | | | | 2022-07-29 |
| SARDA | Santa Ana River Dischargers Association | Public Utility | Bobby Gustafson | Riverside | Bobby.Gustafson@riversideca.gov | 2019-03-14 |
| CIWQS 39886 | Santa Ana Watershed Project Authority | | | | | 1900-01-01 |
| SAWPA | Santa Ana Watershed Protection Authority | Santa Ana Watershed Protection Authority | Peter Vitt | Riverside | pvitt@sawpa.org | 2012-09-11 |
| SBCK | Santa Barbara Channelkeeper | Santa Barbara Channelkeeper | Jenna Driscoll | Santa Barbara | jennad@sbck.org | 2016-12-15 |
| SBarbC | Santa Barbara City | City of Santa Barbara | Jill Murray | Santa Barbara | jmurray@santabarbaraca.gov | 2017-08-01 |
| SBCDPWWL | Santa Barbara City Dept of Public Works Wastewater Laboratory | Santa Barbara City Dept of Public Works Wastewater Laboratory | | | | 2017-06-05 |
| SantaBarbaraCounty | Santa Barbara County | Santa Barbara County | | | | 2017-06-08 |
| SBCPCW | Santa Barbara County - Project Clean Water | | Cathleen Garnand | Santa Barbara | cgarnan@cosbpw.net | 2018-11-15 |
| SBEHS | Santa Barbara County Environmental Health Services | Santa Barbara County Environmental Health Services | Willie Brummett | Santa Barbara | | 2012-05-07 |
| SantaClaraCounty | Santa Clara County | Santa Clara County | | | | 2017-06-08 |
| SCCDH | Santa Clara County Dept of Health, Occupational Health and Safety | Santa Clara County Dept of Health, Occupational Health and Safety | | | | 2017-06-05 |
| SCCWDRWTP | Santa Clara County Water District Rinconada Water Treatment Plant | Santa Clara County Water District Rinconada Water Treatment Plant | | | | 2017-06-05 |
| SCVURPPP | Santa Clara Valley Urban Runoff Pollution Prevention Program | Santa Clara Valley Urban Runoff Pollution Prevention Program | Chris Sommers | | csommers@eoainc.com | 2012-08-30 |
| SCVWD | Santa Clara Valley Water District | Santa Clara Valley Water District | | | | 2017-06-05 |
| CIWQS 39958 | Santa Cruz City | | | | | 1900-01-01 |
| SCCWPCEL | Santa Cruz City Water Pollution Control Environmental Laboratory | Santa Cruz City Water Pollution Control Environmental Laboratory | | | | 2017-06-28 |
| SantaCruzCounty | Santa Cruz County | Santa Cruz County | | | | 2017-06-08 |
| SCCEHS | Santa Cruz County Environmental Health Service | Santa Cruz County Environmental Health Service | Steve Peters | Santa Cruz | | 2012-05-07 |
| SCMUL | Santa Cruz Municipal Utilities Lab | Santa Cruz Municipal Utilities Lab | | | | 2017-06-05 |
| SMBBC_CIMP | Santa Monica Bay Beach Cities CIMP Group | Santa Monica Bay Beach Cities Coordinated Integrated Monitoring Program | | | | 2016-11-28 |
| SMCDPWWD | Santa Monica City Dept of Public Works Water Division | Santa Monica City Dept of Public Works Water Division | | | | 2017-06-05 |
| CIWQS 148702 | Santa Rosa City Dept of Public Works | | | | | 1900-01-01 |
| SYCEA | Santa Ynez Chumash Environmental Office | Santa Ynez Chumash Environmental Office (California) | | | | 2017-06-05 |
| SCWTPL | Santee City Wastewater Treatment Plant Laboratory | Santee City Wastewater Treatment Plant Laboratory | | | | 2017-06-05 |
| SAIC | Science Applications International Corporation | Science Applications International Corporation | | | | 2012-08-30 |
| SCIENV | Scientific Environmental Laboratories | Scientific Environmental Laboratories | | | | 2017-06-05 |
| SCOTT | Scott Laboratories, Petaluma | Scott Laboratories, Petaluma | | | | 2017-06-05 |
| S3LAB | S-Cubed Lab | S-Cubed Lab | | | | 2017-06-05 |
| SEA | Sea Education Association | Sea Education Association | | | | 2017-05-01 |
| SeaWorld | SeaWorld Parks and Entertainment | SeaWorld Parks and Entertainment | | | | 2019-12-18 |
| CIWQS 40389 | Seeley Cnty WD | | | | | 1900-01-01 |
| SEPRO | SePRO Corporation | SePRO Corporation | | Carmel | | 2012-08-30 |
| SAL-MH | Sequoia Analytical - Morgan Hill | Sequoia Analytical - Morgan Hill | | Morgan Hill | | 2016-12-07 |
| SAL-WC | Sequoia Analytical - Walnut Creek | Sequoia Analytical - Walnut Creek | A Kemp | Walnut Creek | | 2016-06-06 |
| SAL | Sequoia Analytical Laboratories, Inc. | Sequoia Analytical Laboratories, Inc. | Patty Penner | Petaluma | ppenner@sequoialabs.com | 2007-09-01 |
| SEQUOIA | Sequoia Analytical Laboratory, Redwood City | Sequoia Analytical Laboratory, Redwood City | | | | 2017-06-05 |
| CIWQS 40516 | SEWER AUTHORITY MID-COASTSIDE | | | | | 1900-01-01 |
| CIWQS 40517 | Sewerage Commission Oroville Region | | | | | 1900-01-01 |
| SGS AXYS | SGS AXYS Analytical Services Ltd. | SGS AXYS Analytical Services Ltd. (formerly known as AXYS Analytical Services Ltd.) | Andrew Porat | Sidney | aporat@axys.com | 2017-06-07 |
| ShastaCounty | Shasta County | Shasta County | | | | 2017-06-08 |
| CIWQS 40607 | Shasta CSA #17 | | | | | 1900-01-01 |
| CIWQS 40620 | Shasta Lake City | | | | | 1900-01-01 |
| SVRCD | Shasta Valley Resource Conservation District | Shasta Valley Resource Conservation District | Karen Mallory | Yreka | mnkmallory@sbcglobal.net | 2012-04-20 |
| SHN-Willits | SHN Engineers & Geologists, Inc. - Willits | SHN Engineers & Geologists, Inc. - Willits office | | Willits | | 2017-09-05 |
| SierraLabs | Sierra Analytical Labs, Inc. | Sierra Analytical Labs, Inc. | Rick Forsythe | Laguna Hills | Sierralabs@sierralabs.net | 2016-01-27 |
| SIERRA | Sierra Cascade Laboratory | Sierra Cascade Laboratory | | | | 2017-06-05 |
| SEM | Sierra Environmental Monitoring, Inc. | Sierra Environmental Monitoring, Inc. | | | sem@sem-analytical.com | 2007-09-01 |
| SFL | Sierra Foothill Laboratory, Inc. | Sierra Foothill Laboratory, Inc. | Sandy Nurse | Jackson | sfl@volcano.net | 2007-09-01 |
| SNARL | Sierra Nevada Aquatic Research Laboratory | Sierra Nevada Aquatic Research Laboratory | David Herbst | Mammoth Lakes | herbst@lifesci.ucsb.edu | 2007-09-01 |
| SPI-Redding | Sierra Pacific Industries - Redding | Sierra Pacific Industries - Redding | Cajun James | Redding | | 2017-09-20 |
| CIWQS 40887 | Sierra Pacific Industries Arcata | | | | | 1900-01-01 |
| CIWQS 449187 | Sierra Pacific Industries Burney | | | | | 1900-01-01 |
| CIWQS 40884 | Sierra Pacific Industries Quincy | | | | | 1900-01-01 |
| CIWQS 40878 | Sierra Pacific Industries Redding | | | | | 1900-01-01 |
| SSI_FDC | Sierra Streams Institute | Sierra Streams Institute previously Friends of Deer Creek | | | | 2017-03-06 |
| STL | Sierra Testing Laboratories, Inc. | Sierra Testing Laboratories, Inc. | | El Dorado Hills | | 2012-08-30 |
| SLKR | Silliker, Inc. | Silliker, Inc. Northern California Laboratory | | Modesto | | 2009-02-19 |
| SilverState | Silver State Analytical Laboratories, Inc. | Silver State Analytical Laboratories, Inc. | | | | 2017-07-03 |
| CIWQS 43973 | Simi Valley City | | | | | 1900-01-01 |
| SiskiyouCounty | Siskiyou County | Siskiyou County | | | | 2017-06-08 |
| Siskiyou-RCD | Siskiyou Resource Conservation District | Siskiyou Resource Conservation District | Erich Yokel | Etna | eyokel@sisqtel.net | 2012-04-20 |
| SRA | Smith River Alliance | Smith River Alliance | Monica Scholey | Crescent City | monica@smithriveralliance.org | 2022-03-04 |
| SMITHEMERY | Smith-Emery Company Dept of Chemistry | Smith-Emery Company Dept of Chemistry | | | | 2017-06-05 |
| SPLI | Soil & Plant Laboratory Inc. | Soil & Plant Laboratory Inc. | | | | 2017-06-05 |
| SCL | Soil Control Laboratory | Soil Control Laboratory | Mike Galloway | Watsonville | mike@controllabs.com | 2009-02-06 |
| SolanaBeachCity | Solana Beach City | City of Solana Beach | | | | 2014-07-02 |
| SolanoCounty | Solano County | Solano County | | | | 2017-06-08 |
| Solano CWA | Solano County Water Agency | Solano County Water Agency | Alexander Rabidoux | Vacaville | arabidoux@scwa2.com | 2017-02-24 |
| SOLANOID | Solano Irrigation District | Solano Irrigation District | | | | 2017-06-05 |
| Solano RCD | Solano Resource Conservation District | Solano Resource Conservation District | Amy King | Dixon | amy.king@solanorcd.org | 2013-11-15 |
| SSA | Solano Stormwater Alliance | Solano Stormwater Alliance | | | | 2023-10-27 |
| CIWQS 41499 | Sonoma Cnty Water Agency (SCWA) R1 | | | | | 1900-01-01 |
| SonomaCounty | Sonoma County | Sonoma County | | | | 2017-06-08 |
| SCAPOSD | Sonoma County Agricultural Preservation and Open Space District | Sonoma County Agricultural Preservation and Open Space District | Bill Keene | | openspace@sonoma-county.org | 2016-11-01 |
| SCPRMD | Sonoma County Permit and Resource Management Department | Sonoma County's consolidated land use planning and development permitting agency created as part of a countywide reorganization in 1995 by bringing staff from five separate together under one roof with one common mission. | | Santa Rosa | | 2017-02-06 |
| SCPHRL | Sonoma County Public Health Regional Laboratory | Sonoma County Public Health Regional Laboratory | Michael Ferris | Santa Rosa | Michael.Ferris@sonoma-county.org | 2015-10-26 |
| SCWA | Sonoma County Water Agency | Sonoma County Water Agency | Nazareth Tesfai | Santa Rosa | nazareth.Tesfai@scwa.ca.gov | 2016-10-18 |
| SEC | Sonoma Ecology Center | SEC's mission is to work with our community to identify and lead actions that achieve and sustain ecological health in Sonoma Valley. | | Eldridge | | 2017-02-15 |
| SMC | Source Molecular Corporation | Source Molecular Corporation | Mauricio Larenas | Miami | info@sourcemolecular.com | 2015-01-28 |
| SDAL | South Dakota Agricultural Laboratories | South Dakota Agricultural Laboratories | | Brookings | regina.wixon@sdaglabs.com | 2019-08-09 |
| CIWQS 41573 | South Feather Water & Power Agency | | | | | 1900-01-01 |
| SSJID | South San Joaquin Irrigation District | South San Joaquin Irrigation District | Stevan Stroud | Manteca | | 2009-09-24 |
| SoSCCo_RegPartners | South Santa Clara County Regional Partners | City of Morgan Hill, City of Gilroy, and Santa Clara County | | | | 2021-10-18 |
| STPUDL | South Tahoe Public Utility District Laboratory | South Tahoe Public Utility District Laboratory | | | | 2017-06-05 |
| SYRCL | South Yuba River Citizens League | SYRCL is a 501 C3 nonprofit, working to protect, restore and maintain the South Yuba Watershed. | Jesse Armfield | Nevada City | jesse@yubariver.org | 2018-12-18 |
| SRRA | Southeast Regional Reclamation Authority | Southeast Regional Reclamation Authority | Ann Harley | Dana Point | | 2012-05-07 |
| SCAMIT | Southern California Association of Marine Invertebrate Taxonomists | Southern California Association of Marine Invertebrate Taxonomists | Larry Lovell | Carson | Llovell@lacsd.org | 2010-03-18 |
| SCCWRP | Southern California Coastal Water Research Project | Southern California Coastal Water Research Project | Eric Stein | Costa Mesa | erics@sccwrp.org | 2007-09-01 |
| SCE | Southern California Edison | Southern California Edison | | | | 2024-07-19 |
| CIWQS 44116 | Southern California Edison- Rosemead | | | | | 1900-01-01 |
| SIU | Southern Illinois University | Southern Illinois University | Michael Lydy | Carbondale | mlydy@siu.edu | 2007-09-01 |
| SOCWA | Southern Orange County Water Authority | Southern Orange County Water Authority | | | | 2012-05-07 |
| SSJWQC | Southern San Joaquin Water Quality Coalition | Southern San Joaquin Water Quality Coalition | David Orth, Bill Thomas | Fresno | dorth@krcd.org | 2009-09-24 |
| SAFIT | Southwest Association of Freshwater Invertebrate Taxonomists | Agency that promotes understanding of the taxonomy and systematics of inland freshwater invertebrates in support of biotic condition of inland aquatic ecosystems of the southwestern United States | Joseph Slusark | Chico | slusark@csuchico.edu | 2010-02-10 |
| SDWCL | Sparkletts Drinking Water Corp Lab, McKesson Water Division | Sparkletts Drinking Water Corp Lab, McKesson Water Division | | | | 2017-06-05 |
| SPECTRUM | Spectrum Labs, Inc. | Spectrum Labs, Inc. | | | | 2017-06-05 |
| SRWQL | Sprague River Water Quality Lab | Sprague River Water Quality Lab | | Chiloquin | | 2014-10-06 |
| SRES | Spring Rivers Ecological Sciences | Spring Rivers Ecological Sciences | | | | 2021-10-27 |
| SVLA | Spring Valley Lake Association | Association that manages Spring Valley Lake | | | | 2023-10-26 |
| CIWQS 41889 | SPX Corp | | | | | 1900-01-01 |
| CIWQS 41942 | ST. HELENA CITY | | | | | 1900-01-01 |
| CIWQS 41969 | Stallion Springs CMSD | | | | | 1900-01-01 |
| Stanford ELC | Stanford Environmental Law Clinic | Teaching clinical program within Stanford Law School | | | | 2022-11-02 |
| Stanford | Stanford Univ | Stanford University | | | | 2014-07-07 |
| StanislausCounty | Stanislaus County | Stanislaus County | | | | 2017-06-08 |
| Stantec_SD | Stantec Consulting Services Inc., San Diego Office | Stantec Consulting Services Inc., San Diego Office | | | | 2022-07-29 |
| Stantec_ZC | Stantec Consulting Services Inc., Zephyr Cove Office | Stantec Consulting Services Inc., Zephyr Cove Office | | Zephyr Cove | | 2024-03-08 |
| SRS | Starr Ranch Sanctuary | Starr Ranch Sanctuary Audubon California | Scott Gibson | | | 2013-09-24 |
| SFCWA | State and Federal Contractors Water Agency | State and Federal Contractors Water Agency | Stephanie Fong | Sacramento | sfong@sfcwa.org | 2018-03-04 |
| CAWCB | State of California Wildlife Conservation Board | The primary responsibilities of WCB are to select, authorize and allocate funds for the purchase of land and waters suitable for recreation purposes and the preservation, protection and restoration of wildlife habitat. | | | | 2017-07-24 |
| SWRCB | State Water Resources Control Board | State Water Resources Control Board | Lori Webber | Sacramento | lwebber@waterboards.ca.gov | 2012-01-17 |
| SWRCB-SWAMP | State Water Resources Control Board - Surface Water Ambient Monitoring Program | State Water Resources Control Board - Surface Water Ambient Monitoring Program | | | | 2017-06-08 |
| SWRCB-SWAMP-BOG | State Water Resources Control Board - Surface Water Ambient Monitoring Program - Bioaccumulation Oversight Program | State Water Resources Control Board - Surface Water Ambient Monitoring Program - Bioaccumulation Oversight Program | | | | 2016-02-03 |
| SWRCB-SWAMP-CHAB | State Water Resources Control Board - Surface Water Ambient Monitoring Program - Cyanobacteria Harmful Algal Bloom Monitoring Program | State Water Resources Control Board - Surface Water Ambient Monitoring Program - Cyanobacteria Harmful Algal Bloom Monitoring Program | | | | 2016-02-03 |
| SWRCB-SWAMP-EPA-NS | State Water Resources Control Board - Surface Water Ambient Monitoring Program - EPA National Surveys Participation | State Water Resources Control Board - Surface Water Ambient Monitoring Program - EPA National Assessment Participation | | | | 2016-02-03 |
| SWRCB-SWAMP-PSA | State Water Resources Control Board - Surface Water Ambient Monitoring Program - Perennial Streams Assessment | State Water Resources Control Board - Surface Water Ambient Monitoring Program - Perennial Streams Assessment | | | | 2016-02-03 |
| SWRCB-SWAMP-RCMP | State Water Resources Control Board - Surface Water Ambient Monitoring Program - Reference Condition Management Program | State Water Resources Control Board - Surface Water Ambient Monitoring Program - Reference Condition Monitoring Program | | | | 2016-02-03 |
| SWRCB-SWAMP-SPoT | State Water Resources Control Board - Surface Water Ambient Monitoring Program - Stream Pollution Trends Monitoring Program | State Water Resources Control Board - Surface Water Ambient Monitoring Program - Stream Pollution Trends Monitoring Program | | | | 2016-02-03 |
| CIWQS 44632 | Stellar Biotechnologies, Inc | | | | | 1900-01-01 |
| Stetson_Carlsbad | Stetson Engineers, Carlsbad Office | Stetson Engineers, Carlsbad Office | | Carlsbad | | 2021-07-02 |
| Stetson_SanRafael | Stetson Engineers, San Rafael Office | Stetson Engineers, San Rafael Office | Joel Barnard | San Rafael | joelb@stetsonengineeers.com | 2022-04-14 |
| SRH | Steve Hanson and Associates | Steve Hanson and Associates | Steve R. Hanson | | | 2007-12-21 |
| SWS | Stillwater Sciences | Stillwater Sciences | Krista Orr | Davis | Krista@stillwatersci.com | 2016-02-01 |
| CIWQS 4247 | Stimpel-Wiebelhaus Associates | | | | | 1900-01-01 |
| CIWQS 42240 | Stockton City | | | | | 1900-01-01 |
| SCMUD | Stockton City Municipal Utilities District | Stockton City Municipal Utilities District | | Stockton | | 2017-06-05 |
| SEWD | Stockton East Water District | Stockton East Water District | | | | 2022-12-07 |
| SESJWCD | Stockton-E. San Joaquin Water Conservation District | Stockton-E. San Joaquin Water Conservation District | | | | 2017-06-05 |
| SCID | Stone Corral Irrigation District | Stone Corral Irrigation District | | | | 2017-06-05 |
| STONER | Stoner Lab | Stoner Lab | | | | 2017-06-05 |
| SETTEK | Summit Environmental Technologies, Inc | Summit Environmental Technologies, Inc | | Cuyahoga Falls | | 2016-08-01 |
| SUN-MTV | Sunnyvale City - Mountain View City | Cities of Sunnyvale and Mountain View | | | | 2024-10-01 |
| SCWPCPL | Sunnyvale City Water Pollution Control Plant Lab | Sunnyvale City Water Pollution Control Plant Lab | | | | 2017-06-05 |
| SunStar | SunStar Laboratories | SunStar Laboratories | | Lake Forest | | 2013-10-01 |
| Surfrider | Surfrider Foundation | Non-profit environmental organization dedicated to protecting coastal waters and beaches | | | | 2022-11-02 |
| McCormick | Susan McCormick | Susan McCormick | Susan McCormick | Georgetown | mcwoods47@sbcglobal.net | 2012-08-30 |
| SLSII | Sustainable Land Stewardship International Institute | Sustainable Land Stewardship International Institute | | | | 2017-04-25 |
| SBFCA | Sutter Butte Flood Control Agency | Sutter Butte Flood Control Agency | | | | 2023-03-15 |
| SutterCounty | Sutter County | Sutter County | | | | 2017-06-08 |
| CIWQS 42701 | Sweetwater Authority | | | | | 1900-01-01 |
| SweetwaterFP | Sweetwater Filtration Plant | Sweetwater Filtration Plant | | | | 2017-06-28 |
| SWRCB-SMC | SWRCB Stormwater Monitoring Coalition | SWRCB Stormwater Monitoring Coalition | | | | 2016-03-11 |
| TKPOA | Tahoe Keys Property Owners Association | Homeowners Association that manages the Tahoe Keys Community located in South Lake Tahoe | Greg Hoover | South Lake Tahoe | GHoover@tahoekeyspoa.org | 2018-12-04 |
| TKWQL | Tahoe Keys Water Quality Laboratory | Tahoe Keys Water Quality Laboratory | | | | 2017-06-05 |
| TPP | Tahoe Paradise Park | Tahoe Paradise Recreation & Park District that administers Tahoe Paradise Park | | | | 2023-07-12 |
| TRPA | Tahoe Regional Planning Agency | Tahoe Regional Planning Agency | Beth Vollmer | Stateline | bvollmer@trpa.org | 2013-02-13 |
| TahoeRCD | Tahoe Resource Conservation District | Tahoe Resource Conservation District | Andrea Buxton | South Lake Tahoe | abuxton@tahoercd.org | 2015-09-09 |
| TKSA | Tahoe Truckee Sanitation Agency | Tahoe Truckee Sanitation Agency | | | | 2017-06-05 |
| TDI-BI | TDI-Brooks International | TDI-Brooks International | | | | 2012-08-30 |
| CIWQS 45432 | Tehama Co SD #1 | | | | | 1900-01-01 |
| TehamaCounty | Tehama County | Tehama County | | | | 2017-06-08 |
| TC | Temecula City | City of Temecula | | Temecula | | 2018-01-30 |
| TTLI | Terra Tech Labs, Inc. | Terra Tech Labs, Inc. | | | | 2017-06-05 |
| CIWQS 538992 | Test | | | | | 1900-01-01 |
| TestAmerica | Test America Laboratories, Inc. | Test America Laboratories, Inc. | | | | 2015-04-24 |
| TCL | Testing and Controls Lab | Testing and Controls Lab | | | | 2017-06-05 |
| TetraTech | Tetra Tech, Inc. | Tetra Tech is a leading provider of consulting, engineering, program management, construction management, and technical services worldwide. | Tim Tringali | Santa Maria | tim.tringali@tetratech.com | 2013-08-07 |
| TEX-AM | Texas A&M University | Texas A&M University-Trace Element Research Laboratory | Dr. Robert J. Taylor | College Station | | 2012-05-07 |
| 5Gyres | The 5 Gyres Institute | The 5 Gyres Institute | Carolyn Box | | carolynn@5gyres.org | 2018-04-26 |
| BFMB | The Bay Foundation of Morro Bay | The Bay Foundation of Morro Bay | Gary Ruggerdone | Morro Bay | | 2015-06-24 |
| CIWQS 39738 | The City of San Juan Bautista | | | | | 1900-01-01 |
| MCCCL | The Monterey County Consolidated Chemistry Lab | The Monterey County Consolidated Chemistry Lab | | Montery | | 2012-10-05 |
| TNC | The Nature Conservancy | Non profit organization focused on conservation | | | | 2017-03-08 |
| TNC-BIGSPRINGS | The Nature Conservancy Big Springs | The Nature Conservancy Big Springs | Amy Hoss | Mount Shasta | ahoss@tnc.org | 2012-04-20 |
| TNC-KFALLS | The Nature Conservancy Williamson River Delta | The Nature Conservancy Williamson River Delta | Heather Hendrixson | Klamath Falls | hhendrixson@tnc.org | 2012-04-20 |
| CSUSD-SafeWaTER | The Safe WaTER Laboratory at California State University, San Diego | The Safe WaTER Laboratory at California State University, San Diego, led by Dr. Matthew E. Verbyla, studies water quality, including waterborne pathogens, indicators of fecal pollution, and microbial risk | Matthew Verbyla | San Diego | mverbyla@sdsu.edu | 2024-01-26 |
| TSF | The Sierra Fund | The Sierra Fund | Nick Graham | Nevada City | nick.graham@sierrafund.org | 2018-11-27 |
| TWL | The Twining Laboratories, Inc. | The Twining Laboratories, Inc. | Ronald J. Boquist | Fresno | ronb@twining.com | 2007-09-01 |
| CIWQS 45707 | THE VENDO COMPANY | | | | | 1900-01-01 |
| TWP | The Watershed Project | The Watershed Project | Helen Fitanides | Richmond | helen@thewatershedproject.org | 2017-09-12 |
| TWC | The Wildlands Conservancy | Nonprofit agency dedicated to preserving the beauty and biodiversity of the earth and to provide programs so that children may know the wonder and joy of nature | Zach Kantor-Anaya | Oak Glen | zach.k@wildlandsconservancy.org | 2022-06-02 |
| THERMOL | Thermol Analytical Lab | Thermol Analytical Lab | | | | 2017-06-05 |
| TA | Thomas Analytical | Thomas Analytical | | | | 2012-05-07 |
| CIWQS 47044 | Thousand Oaks City | | | | | 1900-01-01 |
| TOCWWTPL | Thousand Oaks City WasteWater Treatment Plant Laboratory | Thousand Oaks City WasteWater Treatment Plant Laboratory | | | | 2017-06-28 |
| TPC | Timber Products Company | Timber Products Company | Stuart Farber | Yreka | stuf@sor.teamtp.com | 2012-04-20 |
| TDN | Tolowa Dee-ni Nation | Tolowa Dee-ni Nation | Ridge McLennan | Smith River | ridge.mclennan@tolowa.com | 2018-05-22 |
| Torrent | Torrent Laboratory, Inc. | Torrent Laboratory, Inc. | Kathie Evans | Milpitas | pm@torrentlaboratory.com | 2015-08-20 |
| TOTALFLOW | Total Flow, Inc. | Total Flow, Inc. | | | | 2014-08-04 |
| ToxScan | ToxScan | ToxScan | Dave Lewis | Watsonville | dlewis@toxscan.com | 2007-09-01 |
| CIWQS 46150 | Tracy City | | | | | 1900-01-01 |
| TCWTP | Tracy City Water Treatment Plant | Tracy City Water Treatment Plant | | | | 2017-06-28 |
| TrinityCounty | Trinity County | Trinity County | | | | 2017-06-08 |
| TU | Trout Unlimited | Trout Unlimited is a national organization with a 57-year history of ensuring that wild and native trout populations, as well as local anglers, can thrive. | | | | 2017-07-24 |
| TRWC | Truckee River Watershed Council | Truckee River Watershed Council | Beth Christman | Truckee | bchristman@truckeeriverwc.org | 2012-05-11 |
| Truesdail | Truesdail Laboratories, Inc. | Truesdail Laboratories, Inc. | | | | 2015-04-24 |
| TulareCounty | Tulare County | Tulare County | | | | 2017-06-08 |
| TBWQC | Tule Basin Water Quality Coalition | Tule Basin Water Quality Coalition | David DeGroot | Visalia | davidd@4-creeks.com | 2014-07-09 |
| Tule SW | Tule River Sub-Watershed | Tule River Sub-Watershed of the Southern San Joaquin Water Quality Coalition, ILRP | | | | 2011-03-24 |
| TuolomneCounty | Tuolomne County | Tuolomne County | | | | 2017-06-08 |
| TuolumneRCD | Tuolumne County Resource Conservation District | Tuolumne County Resource Conservation District | | Sonora | | 2010-10-19 |
| TuolumneRT | Tuolumne River Trust | Tuolumne River Trust | | Sonora | | 2010-10-19 |
| CIWQS 46497 | Tuolumne Utilities District | | | | | 1900-01-01 |
| CIWQS 46509 | Turlock City | | | | | 1900-01-01 |
| TCWQCL | Turlock City Water Quality Control Laboratory | Turlock City Water Quality Control Laboratory | | | | 2017-06-28 |
| TID | Turlock Irrigation District | Turlock Irrigation District | Robert M. Nees | Turlock | | 2009-09-24 |
| TLSC | Twining Labs Southern California | Twining Labs Southern California | | | | 2017-06-05 |
| USBR-SCCAO | U.S. Bureau of Reclamation - SCCAO | U.S. Bureau of Reclamation - South-Central California Area Office | Stacy Brown | Fresno | sbrown@usbr.gov | 2012-08-30 |
| USBR-CGBRO | U.S. Bureau of Reclamation California-Great Basin Regional Office | U.S. Bureau of Reclamation California-Great Basin Regional Office | Brian Urbick | Sacramento | burbick@usbr.gov | 2022-10-18 |
| USBR-KFALLS | U.S. Bureau of Reclamation Klamath Falls | U.S. Bureau of Reclamation Klamath Falls | Rick Carlson | Klamath Falls | racarlson@mp.usbr.gov; jasbill@mp.usbr.gov | 2012-04-20 |
| USBR-NC | U.S. Bureau of Reclamation Northern California Area Office, NC 312 | U.S. Bureau of Reclamation Northern California Area Office, NC 312 | Paul Zedonis | Shasta Lake | pzedonis@usbr.gov | 2013-09-26 |
| USBR-TRINITY | U.S. Bureau of Reclamation Trinity | U.S. Bureau of Reclamation Trinity | Eric Peterson | Weaverville | ebpeterson@usbr.gov | 2012-04-20 |
| USFWS-Arcata | U.S. Fish and Wildlife Service Arcata Fish and Wildlife Office | U.S. Fish and Wildlife Service Arcata Fish and Wildlife Office | Nick Hetrick | Arcata | nick_hetrick@fws.gov | 2012-03-21 |
| USFWS-Klamath | U.S. Fish and Wildlife Service Klamath Falls Office | U.S. Fish and Wildlife Service Klamath Falls Office | | | | 2012-10-23 |
| USFWS | U.S. Fish and Wildlife Services - Sacramento | U.S. Fish and Wildlife Services - Sacramento | | | | 2013-01-17 |
| USFS | U.S. Forest Service | U.S. Forest Service | Lisa Petrusa | | | 2012-05-07 |
| USFS-AREMP | U.S. Forest Service AREMP | U.S. Forest Service AREMP | Steve Lanigan | Portland | slanigan@fs.fed.us | 2012-04-20 |
| USFS-FREMONT-WINEMA | U.S. Forest Service Fremont Winema | U.S. Forest Service Fremont Winema | Dick Ford | Klamath Falls | richard_ford@fs.fed.us | 2012-04-20 |
| USFS-KLAMATH | U.S. Forest Service Klamath Butte | U.S. Forest Service Klamath Butte | Greg Laurie | Yreka | glaurie@fs.fed.us | 2012-04-20 |
| USFS-LASSEN | U.S. Forest Service Lassen | U.S. Forest Service Lassen | | | | 2023-07-25 |
| USFS-MODOC | U.S. Forest Service Modoc | U.S. Forest Service Modoc | Marty Yamagiwa | Alturas | myamagiwa@fs.fed.us | 2012-04-20 |
| USFS-San Bernardino | U.S. Forest Service San Bernardino | U.S. Forest Service San Bernardino | Bill Wells | San Bernardino | williamewells@fs.fed.us | 2012-05-07 |
| USFS-SHASTA-TRINITY | U.S. Forest Service Shasta Trinity | U.S. Forest Service Shasta Trinity | Christine Mai | Redding | cmai@fs.fed.us | 2012-04-20 |
| USFS-SIX-RIVERS | U.S. Forest Service Six Rivers | U.S. Forest Service Six Rivers | LeRoy Cyr | Orleans | lcyr@fs.fed.us | 2012-04-20 |
| USFS-VALLEJO | U.S. Forest Service Vallejo | U.S. Forest Service Vallejo | Joseph Furnish | Vallejo | jfurnish01@fs.fed.us | 2013-03-19 |
| USGS-PCMSC | U.S. Geological Survey - Pacific Coastal and Marine Science Center | The Pacific Coastal and Marine Science Center of the USGS studies the coasts of the western United States, including Alaska and Hawaii. | | Santa Cruz | | 2015-09-28 |
| USGS-KFALLS | U.S. Geological Survey Klamath Falls | U.S. Geological Survey Klamath Falls | Sara Eldridge | Klamath Falls | seldridge@usgs.gov | 2012-04-20 |
| USGS-CAWSC | U.S. Geological Survey-California Water Science Center | U.S. Geological Survey-California Water Science Center | Jim Orlando | Sacramento | jorlando@usgs.gov | 2018-03-04 |
| USGS-CB | U.S. Geological Survey-Carnelian Bay Field Office | U.S. Geological Survey-Carnelian Bay Field Office | Gerald Rockwell | Carnelian Bay | glrock@usgs.gov | 2007-09-01 |
| USGS-FRESC | U.S. Geological Survey-Forest and Rangeland Ecosystem Science Center | U.S. Geological Survey-Forest and Rangeland Ecosystem Science Center | Collin Eagles-Smith | Corvallis | ceagles-smith@usgs.gov | 2012-11-06 |
| USGS-MRL | U.S. Geological Survey-Mercury Research Laboratory | U.S. Geological Survey-Mercury Research Laboratory | John F. DeWild | Middleton | jfdewild@usgs.gov | 2014-12-12 |
| USGS-NWQL | U.S. Geological Survey-National Water Quality Laboratory | U.S. Geological Survey-National Water Quality Laboratory | GS-W-COden NWQL LabHelp | Denver | labhelp@usgs.gov | 2013-05-09 |
| USGS-Scto | U.S. Geological Survey-Water Resources-Sacramento | U.S. Geological Survey-Water Resources-Sacramento | Lawrence A. LeBlanc | Sacramento | lleblanc@usgs.gov | 2007-09-01 |
| USGS-WERC | U.S. Geological Survey-Western Ecological Research Center | U.S. Geological Survey-Western Ecological Research Center | Collin Eagles-Smith | | | 2013-05-13 |
| NPS-Whiskeytown | U.S. National Park Service-Whiskeytown National Recreation Area | U.S. National Park Service-Wiskeytown National Recreation Area | | | | 2022-05-26 |
| USNV | U.S. Navy | U.S. Navy, Space & Naval Warfare Systems Center | Jeff Grovig | San Diego | | 2012-05-16 |
| CIWQS 470633 | UC Davis | | | | | 1900-01-01 |
| UCD-AL | UC Davis Analytical Laboratory | University of California Davis Analytical Laboratory | Traci Francis | Davis | anlab@ucdavis.edu | 2020-03-13 |
| UCD-SIF | UC Davis Stable Isotope Facility | UC Davis Stable Isotope Facility | David Harris | Davis | dharris@ucdavis.edu | 2007-12-21 |
| UCD-AHPL | UC Davis-Aquatic Health Program Laboratory | University of California Davis-Aquatic Health Program Laboratory | Marie Stillway | Davis | ladeanovic@ucdavis.edu | 2015-08-17 |
| UCD-FCCL | UC Davis-Fish Conservation and Culture Laboratory | The Fish Conservation and Culture Laboratory (FCCL), has been a part of the University of California, Davis, since 1996 and is part of the Biological and Agriculture Engineering Department currently. | | | | 2017-10-03 |
| UCD-SVM | UC Davis-School of Veterinary Medicine | University of California Davis-School of Veterinary Medicine | | Davis | | 2016-03-17 |
| UCLA | UC Los Angeles | University of California Los Angeles | | | | 2014-07-08 |
| UC Merced EAL | UC Merced Environmental Analytical Laboratory | University of California, Merced Environmental Analytical Laboratory | | | | 2021-06-04 |
| UCR-ESRL | UC Riverside - Environmental Sciences Research Laboratory | UC Riverside - Environmental Sciences Research Laboratory | | Riverside | | 2014-09-20 |
| CIWQS 285299 | UC San Diego | | | | | 1900-01-01 |
| UCSD-SIO | UCSD Scripps Institution of Oceanography Oceanic | UCSD Scripps Institution of Oceanography Oceanic | Dr. Andrew Dickson | | | 2013-09-26 |
| CIWQS 47705 | Ukiah City | | | | | 1900-01-01 |
| CIWQS 47737 | Uni-Kool Company | | | | | 1900-01-01 |
| UnionCity | Union City | Union City Dept of Public Works | Thomas Ruark | Union City | ThomasR@ci.union-city.ca.us | 2016-09-22 |
| CIWQS 47784 | Union Pacific RR Company | | | | | 1900-01-01 |
| USD | Union Sanitary District | Union Sanitary District | Jim Chen | Union City | Jim_Chen@unionsanitary.com | 2007-12-21 |
| CIWQS 485093 | United Auburn Indian Community | | | | | 1900-01-01 |
| UCSB-MSI | University of California at Santa Barbara Marine Science Institute | University of California at Santa Barbara Marine Science Institute | Uta Passow | Santa Barbara | uta.passow@lifesci.ucsb.edu | 2013-09-26 |
| UCB-WL | University of California Berkeley-Weston Lab | University of California Berkeley-Weston Lab | Don Weston | Richmond | dweston@berkeley.edu | 2007-09-01 |
| UCCE_Monterey | University of California Cooperative Extension Monterey County | applied agricultural research organization | | | | 2017-01-31 |
| UCD_HGL | University of California Davis - Mercury Lab | University of California Davis - Mercury Lab | Darell G. Slotton | Davis | dgslotton@ucdavis.edu | 2012-08-30 |
| UCD-ATW | University of California Davis Atwill Lab | University of California Davis Atwill Lab | Xunde Li | Davis | xdli@ucdavis.edu | 2010-05-04 |
| UCD-GGE | University of California Davis Graduate Group in Ecology | University of California Davis Graduate Group in Ecology | | Davis | | 2012-07-06 |
| UCD-PES | University of California Davis Plant and Environmental Sciences Department | University of California Davis Plant and Environmental Sciences Department | Allen Barnes | Davis | ambarnes@ucdavis.edu | 2015-01-28 |
| UCD-WFCB | University of California Davis Wildlife, Fish and Conservation Biology | University of California Davis Wildlife, Fish and Conservation Biology | Nann Fangue | Davis | | 2012-07-05 |
| UCD-WRTZ | University of California Davis Wuertz Lab | University of California Davis Wuertz Lab | Alex Schriewer | Davis | aschriewer@ucdavis.edu | 2010-05-04 |
| ZALOM | University of California Davis, Zalom Entomology Laboratory | Prof. Frank Zalom, Dept of Entomology, University of California Davis | Dr. Frank Zalom | Davis | fgzalom@ucdavis.edu | 2007-09-01 |
| UCD-ALL | University of California Davis-Aquatic Limnology Lab | University of California Davis-Aquatic Limnology Lab | Tina Hammell | Davis | tlhammell@ucdavis.edu | 2007-09-01 |
| UCD-BML | University of California Davis-Bodega Marine Laboratory | University of California Davis Bodega Marine Laboratory | | Bodega Bay | | 2017-05-12 |
| UCD-GC | University of California Davis-Granite Canyon | University of California Davis-Granite Canyon | John Hunt | Monterey | jwhunt@ucdavis.edu | 2007-09-01 |
| UCD-HOBB | University of California Davis-Hobbs Laboratory | University of California Davis-Hobbs Laboratory | | Davis | | 2018-07-30 |
| UCD-LAWR | University of California Davis-LAWR | University of California Davis-LAWR | Randy Dahlgren | Davis | radahlgren@ucdavis.edu | 2007-09-01 |
| UCD-TERC | University of California Davis-Tahoe Environmental Research Center | University of California Davis-Tahoe Environmental Research Center | | Incline Village | | 2013-05-06 |
| UCD-TATE | University of California Davis-Tate Laboratory | University of California Davis-Tate Laboratory | Kenneth W. Tate | Davis | | 2010-11-17 |
| UCSB | University of California Santa Barbara | University of California Santa Barbara | Craig A. Carlson | Santa Barbara | carlson@lifesci.ucsb.edu | 2007-12-21 |
| UCSB-HOLDEN | University of California Santa Barbara - Holden Laboratory | University of California Santa Barbara - Holden Laboratory | | | holden@bren.ucsb.edu | 2019-10-21 |
| UCSC-CASFS | University of California Santa Cruz - Center for Agroecology and Sustainable Food Systems | University of California Santa Cruz - Center for Agroecology and Sustainable Food Systems | | | | 2016-09-15 |
| UCSC-OL | University of California Santa Cruz - Division of Natural Sciences | University of California Santa Cruz - Division of Natural Sciences | Corinne Bacon | Santa Cruz | | 2007-12-21 |
| UCSC-DET | University of California Santa Cruz - Environmental Toxicology | University of California Santa Cruz - Environmental Toxicology | Genine Scelfo | Santa Cruz | gms@earthsci.ucac.edu | 2007-12-21 |
| UCSC-IMS | University of California Santa Cruz - Institute of Marine Sciences | University of California Santa Cruz - Institute of Marine Sciences | Cecile Mioni | | | 2011-06-27 |
| UCSC-Shenn | University of California Santa Cruz - Shennan Laboratories | University of California Santa Cruz - Shennan Laboratories | | | | 2011-10-31 |
| UCD-AEAL | University of California-Aquatic Ecoystems Analysis Laboratory | University of California-Aquatic Ecoystems Analysis Laboratory | Michael Johnson | Davis | mbjohnson@ucdavis.edu | 2007-09-01 |
| UCOB | University of Colorado Boulder | University of Colorado Boulder | University of Colorado Boulder | | | 2008-04-24 |
| UGA | University of Georgia Atlanta | University of Georgia Atlanta | | | | 2015-05-19 |
| UIASL | University of Idaho Analytical Science Laboratory | University of Idaho Analytical Science Laboratory | | | | 2017-12-14 |
| UM-CES | University of Maryland Center for Environmental Science | University of Maryland Center for Environmental Science | Margaret A. Palmer | Solomons | palmer@cbl.umces.edu | 2007-12-21 |
| UM-AGNR | University of Maryland, College of Agriculture and Natural Resources | University of Maryland, College of Agriculture and Natural Resources | | | | 2012-04-30 |
| UM-HPEL | University of Maryland, Horn Point Environmental Laboratory | University of Maryland, Horn Point Environmental Laboratory | Jeffrey Alexander | Cambridge | jalexand@hpl.umces.edu | 2012-03-01 |
| USC | University of Southern California | University of Southern California | | | | 2012-05-07 |
| UoT-RL | University of Toronto - Rochman Lab | University of Toronto - Rochman Lab | Chelsea Rochman | Toronto | chelsea.rochman@utoronto.ca | 2018-04-26 |
| UU-EGI | University of Utah, Energy and Geoscience Institute | University of Utah, Energy and Geoscience Institute | Theresa Lowe | Salt Lake City | tlowe@egi.utah.edu | 2007-12-21 |
| UWLC | University of Wisconsin - La Crosse | Dr. Mark Sandheinrich, La Crosse River Studies Center,University of Wisconsin | Dr. Mark Sandheinrich | La Crosse | sandhein.mark@uwlax.edu | 2012-08-30 |
| UFRWG | Upper Feather River Watershed Group | Upper Feather River Watershed Group | | | | 2011-08-25 |
| UMRWC | Upper Merced River Watershed Council | Upper Merced River Watershed Council | | | | 2011-05-05 |
| USLT_RCD | Upper Salinas-Las Tablas Resource Conservation District | US-LT RCD is a non-regulatory, not-for-profit organization that provides technical assistance, education and resources to help agricultural, rural and urban communities preserve these natural elements while supporting robust land productivity. | Devin Best | | devin@us-ltrcd.org | 2018-05-10 |
| USGR EWMP Group | Upper San Gabriel River Enchanced Watershed Management Program Group | Upper San Gabriel River Enchanced Watershed Management Program Group | | | | 2016-03-10 |
| USMILG_TPG | Upper Santa Margarita Irrigated Lands Group | Third Party Group Discharger from Commercial Agricultural Operations in Upper Santa Margarita San Diego Region 9 | | | | 2020-05-22 |
| URS | URS Corporation | URS Corporation | J. Edmund | Oakland | jody_edmund@urscorp.com | 2007-09-01 |
| USAF-CLINIC | US Air Force Clinic EMC. | US Air Force Clinic EMC. | | | | 2017-06-05 |
| USAF-MAFB | US Air Force McClellan Air Force Base | US Air Force McClellan Air Force Base | | | | 2017-06-05 |
| USAF-BROOKS | US AIR FORCE, Brooks Base Lab, Texas | US AIR FORCE, Brooks Base Lab, Texas | | | | 2017-06-05 |
| USARMY-ORD | US Army Fort Ord | US Army Fort Ord | | | | 2017-06-05 |
| USDA | US Dept Of Agriculture | US Dept Of Agriculture | | | | 2017-06-08 |
| USEPA | US Environmental Protection Agency | US Environmental Protection Agency | | | | 2017-06-08 |
| USEPA-REGION8 | US Environmental Protection Agency Region 8 Laboratory, Colorado | US Environmental Protection Agency Region 8 Laboratory, Colorado | | | | 2017-06-05 |
| USGS | US Geological Survey | US Geological Survey | | | | 2017-06-08 |
| USGS-EMAP | US Geological Survey Environmental Monitoring And Assessment Program | US Geological Survey Environmental Monitoring And Assessment Program | | | | 2017-06-08 |
| USGS-CWSC | US Geological Survey-Clean Water Science Center | US Geological Survey-Clean Water Science Center | Stephen Low | Santa Cruz | stephlow@usgs.gov | 2015-02-02 |
| USGS-Lawrence | US Geological Survey-District Water Quality Laboratory, Lawrence, KS | US Geological Survey-District Water Quality Laboratory, Lawrence, KS | | | | 2017-06-05 |
| USGS-PFRG-OCRL | US Geological Survey-Pesticide Fate Research Group (PFRG), Organic Chemistry Research Laboratory (OCRL) | U.S. Geological Survey-Pesticide Fate Research Group (PFRG), Organic Chemistry Research Laboratory (OCRL) | James Orlando | Sacramento | jorlando@usgs.gov | 2015-08-03 |
| USGS-Menlo | US Geological Survey-Water Resources-Menlo Park | US Geological Survey-Water Resources-Menlo Park | Robin Stewart | Menlo Park | arstewar@usgs.gov | 2015-05-05 |
| USNPS | US National Park Service Water Resources Division | US National Park Service Water Resources Division | | | | 2017-06-08 |
| CIWQS 13831 | US Navy Naval Air Facility El Centro | | | | | 1900-01-01 |
| USNAVY-PSL | US Navy Postgraduate School Lab | US Navy Postgraduate School Lab | | | | 2017-06-05 |
| USNAVY-PWEEL | US Navy Public Works Environmental Engineering Lab | US Navy Public Works Environmental Engineering Lab | | | | 2017-06-05 |
| CIWQS 48447 | USDI Fish & Wildlife Service Coleman | | | | | 1900-01-01 |
| CIWQS 48451 | USDI Fish & Wildlife Service Shasta Lake | | | | | 1900-01-01 |
| CIWQS 31226 | USDI National Park Service Yosemite | | | | | 1900-01-01 |
| CIWQS 48522 | USS-POSCO INDUSTRIES | | | | | 1900-01-01 |
| USU-WCMAFE | Utah State University WCMAFE | Utah State University Western Center for Monitoring & Assessment of Freshwater Ecosystems | Charles Hawkins | Logan | chuck.hawkins@usu.edu | 2015-01-26 |
| CIWQS 11176 | Vacaville City DPW | | | | | 1900-01-01 |
| VALENT | Valent Lab | Valent Lab | | | | 2017-06-05 |
| VSFCD | Vallejo Sanitation and Flood Control District | The Vallejo Sanitation & Flood Control District is an independent special district created by the State of California in 1952 to collect and treat wastewater, and protect the Vallejo community from flooding. | Doug Scott | Vallejo | | 2016-02-22 |
| CIWQS 48942 | Valley SD | | | | | 1900-01-01 |
| VALLEY | Valley Toxicology Service | Valley Toxicology Service | | | | 2017-06-05 |
| CIWQS 49654 | Valley Water Disposal Company | | | | | 1900-01-01 |
| VCPWA | VCPWA-County Stormwater Program | VCPWA-County Stormwater Program | | | | 2019-01-17 |
| CIWQS 11177 | Ventura City | | | | | 1900-01-01 |
| VenturaCounty | Ventura County | Ventura County | | | | 2017-06-08 |
| VCEHD | Ventura County Environmental Health Division | Ventura County Environmental Health Division | Richard Hauge | Ventura | | 2012-05-07 |
| VCHCA | Ventura County HCA Laboratories | Ventura County HCA Laboratories | | | | 2012-05-07 |
| VCSQMP | Ventura County Stormwater Quality Monitoring Program | Ventura County Stormwater Quality Monitoring Program | Kelly Haas | | | 2012-05-07 |
| VCWPD | Ventura County Watershed Protection District | Ventura County Water Protection District | | | | 2012-05-31 |
| VESTRA | VESTRA Resources, Inc. | VESTRA Resources, Inc. | | Redding | | 2011-09-29 |
| Viejas | Viejas Tribal Government | Viejas Band of Kumeyaay Indians Government | | Alpine | | 2024-05-07 |
| VIMS-DEAAH | Virigina Institute of Marine Science-Department of Environmental and Aquatic Animal Health | Virigina Institute of Marine Science-Department of Environmental and Aquatic Animal Health | Mark J. La Guardia | Gloucester Point | markl@vims.edu | 2012-08-30 |
| CIWQS 8718 | Visalia City | | | | | 1900-01-01 |
| VCE | Visalia City Engineering | City of Visalia, Engineering | | Visalia | | 2017-08-16 |
| VAL | Vista Analytical Laboratory | Vista Analytical Laboratory | Anne Wilhoit | El Dorado Hills | awilhoit@vista-analytical.com | 2015-03-13 |
| VistaCity | Vista City | City of Vista | | | | 2014-07-02 |
| VistaIG | Vista Irrigation District | Vista Irrigation District, Lake Henshaw RB9 | Don Smith | Vista | dsmith@vidwater.org | 2020-09-29 |
| CIWQS 49526 | VOPAK Terminal Los Angeles Inc | | | | | 1900-01-01 |
| WRID | Walker River Irrigation District | An independent irrigation district operating two storage reservoirs and drainage systems in Smith and Mason Valleys | | | | 2023-07-12 |
| CIWQS 50246 | Washington/Niagara Mining Ptnr | | | | | 1900-01-01 |
| DFW-WPCL | Water Pollution Control Lab - DFW | Water Pollution Control Lab - DFW | | | | 2014-02-26 |
| WTCL | Water Testing & Consulting Laboratory | Water Testing & Consulting Laboratory | | | | 2017-06-05 |
| CIWQS 50305 | Watsonville City | | | | | 1900-01-01 |
| WWW | Watsonville Wetlands Watch | Watsonville Wetlands Watch | Emily Howard | Watsonville | Emily@watsonvillewetlandswatch.org | 2021-05-03 |
| WKL | Weck Laboratories, Inc. | Weck Laboratories, Inc. | Jayna Kostura | Industry | jkostura@wecklabs.com | 2007-09-01 |
| WCAL | West Coast Analytical Service, Santa Fe | West Coast Analytical Service, Santa Fe | | | | 2017-06-05 |
| WCILP | Westcoast Coalition for Irrigated Lands Program | Westcoast Coalition for Irrigated Lands Program | Joe McGahan | Los Banos | jmcgahan@summerseng.com | 2007-09-01 |
| WAL | Western Agricultural Laboratory | Western Agricultural Laboratory | | | | 2017-06-05 |
| WAL_Chino | Western Agricultural Laboratory, Chino | Western Agricultural Laboratory, Chino | | | | 2017-06-05 |
| WETLAB | Western Environmental Testing Laboratory | Western Environmental Testing Laboratory | | | | 2015-06-11 |
| CIWQS 517405 | Western Riverside County Regional Wastewater Authority | | | | | 1900-01-01 |
| WSRCD | Western Shasta RCD | Western Shasta Resource Conservation District | | Anderson | wsrcd@westernshastarcd.org | 2014-02-18 |
| WSC | Westlands Stormwater Coalition | Westlands Stormwater Coalition | Susan Ramos, Orvil McKinnis | Fresno | sramos@westlandswater.org | 2009-09-24 |
| WWD | Westlands Water District | Westlands Water District | | | | 2011-05-12 |
| CIWQS 51663 | Westmorland City | | | | | 1900-01-01 |
| WestonSolu | Weston Solutions | Weston Solutions | Lisa Marie Kay | Carlsbad | | 2007-09-01 |
| WSJRWC | Westside San Joaquin River Watershed Coalition | Westside San Joaquin River Watershed Coalition | Joseph McGahan | Hanford | jmcgahan@summerseng.com | 2009-09-24 |
| WWQC | Westside Water Quality Coalition | Westside Water Quality Coalition | Greg Hammet | McKittrick | ghammett@belridgewsd.com | 2014-07-09 |
| WRA | Wetlands Research Associates | Wetlands Research Associates is a biological consulting firm based in San Rafael | Kari Dupler | San Rafael | dupler@wra-ca.com | 2018-01-10 |
| CIWQS 50761 | Wheelabrator Shasta Energy Co | | | | | 1900-01-01 |
| WRMWSD | Wheeler Ridge-Maricopa Water Storage District | Wheeler Ridge-Maricopa Water Storage District | | Bakersfield | | 2019-04-30 |
| Wildlands | Wildlands, Inc. | Wildlands provides environmental solutions to restore and protect wetlands and other sensitive habitats for compensatory mitigation. | | Rocklin | | 2015-11-02 |
| WLDC | Wildomar City | City of Wildomar | | Wildomar | | 2018-01-30 |
| WRS | Willamette Research Station | Willamette Research Station | | Corvallis | | 2013-09-26 |
| CIWQS 523730 | Williams City | | | | | 1900-01-01 |
| CIWQS 50967 | Willits City | | | | | 1900-01-01 |
| CIWQS 50978 | Willows City | | | | | 1900-01-01 |
| WFI | Windset Farms, Inc. | Windset Farms, Inc. | | | | 2018-01-12 |
| CIWQS 51027 | Windsor Water District | | | | | 1900-01-01 |
| WITZKE | Witzke Lab | Witzke Lab | | | | 2017-06-05 |
| WCCA | Wolf Creek Community Aliance | Wolf Creek Community Aliance | | Grass Valley | wolf@wolfcreekalliance.org | 2017-04-25 |
| WoodAquaticTox | Wood Aquatic Toxicology Laboratory | Wood Aquatic Toxicology Laboratory | | San Diego | | 2019-08-16 |
| WoodGroup | Wood Group, Inc. | Wood Group, Inc. | Luis De La Torre | San Diego | luis.delatorre@woodplc.com | 2018-03-05 |
| WoodMolec | Wood Molecular Services Lab | Wood Molecular Services Laboratory | Darcy McCargar | San Diego | | 2020-04-22 |
| WOODARDCURRAN | Woodard & Curran | Woodard & Curran | | | | 2019-05-03 |
| CIWQS 51158 | Woodland City | | | | | 1900-01-01 |
| WoRMS | World Register of Marine Species | World Register of Marine Species | | | | 1900-01-01 |
| WRECO | Wreco | Wreco | | Walnut Creek | | 2016-06-28 |
| WSU | Wright State University | Wright State University | | Dayton | | 2016-12-07 |
| WSPAquaticToxSD | WSP Aquatic Toxicology Laboratory San Diego | WSP Aquatic Toxicology Laboratory San Diego | | | | 2022-12-13 |
| WSP_SD_MSL | WSP San Diego Molecular Services Laboratory | WSP San Diego Molecular Services Laboratory | Darcy McCargar | San Diego | darcy.ebentier@wsp.com | 2022-12-19 |
| WSP_SD_SkyPkwy | WSP San Diego Sky Parkway | WSP San Diego Sky Parkway | Teresa Perone | San Diego | teresa.perone@wsp.com | 2022-10-13 |
| YoloCounty | Yolo County | Yolo County | | | | 2017-06-08 |
| CIWQS 52191 | Yountville, Town of | | | | | 1900-01-01 |
| CIWQS 52205 | Yuba City | | | | | 1900-01-01 |
| YubaCounty | Yuba County | Yuba County | | | | 2017-06-08 |
| CIWQS 356893 | Yucaipa Valley Water Dist | | | | | 1900-01-01 |
| Yurok-Tribe | Yurok Tribal Environmental Program | Yurok Tribal Environmental Program | Kassandra Grimm | Klamath | kgrimm@yuroktribe.nsn.us | 2012-04-20 |
| ZALCO | Zalco Laboratories, Inc. | Zalco Laboratories, Inc. | | | | 2017-06-05 |
| ZENECA | Zeneca Lab | Zeneca Lab | | | | 2017-06-05 |
| Zone7 | Zone 7 Water Agency | Zone 7 Water Agency | Tami Church | Livermore | tchurch@zone7water.com | 2017-03-09 |
| ZYMAX | Zymax Envirotechnology | Zymax Envirotechnology | | | | 2017-06-05 |
