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Providing Data to be Assessed for the 303(d) List

The California State Water Resources Control Board and the Regional Water Quality Control Boards (together, the Water Boards) develop the list of impaired water bodies within California, pursuant to section 303(d) of the federal Clean Water Act. The Water Quality Control Policy for Developing California’s Clean Water Act Section 303(d) List (Listing Policy) describes the water quality assessment process and specifies that data and information for this process must be submitted into CEDEN. There is an alternative process outlined in data solicitation notices for data and information not suitable for CEDEN, such as photographs.

Data submitted for assessment must meet the format, vocabulary, and business rule requirements defined in the data submittal templates, and guidance documents, and successfully pass the Template Checker. Additionally:

In accordance with our template change procedures, the above two requirements will be reflected in CEDEN documentation and the Template Checker for CEDEN data starting in January 2017.

A quality assurance project plan (QAPP), or equivalent, as described in section 6.1.4 of the Listing Policy is required to determine the quality of the data and information being used for assessment. QAPPs developed and complied with when collecting and analyzing data submitted to CEDEN should be emailed to WQAssessment@waterboards.ca.gov. Be sure to reference the CEDEN project code(s) that the QAPP covers. This effectively submits the QAPP to the Water Quality Assessment Unit at the Water Boards. If the QAPP is not received or cannot be associated with submitted data, the data will not be used as part of the assessment process.

A data solicitation notice has been issued by the Water Board it specifies that data and information must be loaded into CEDEN by 5:00 p.m. May 3, 2017 in order to be considered in the 2018 assessment process or listing cycle. In order to be loaded, the must be submitted in the correct format (as validated by the Template Checker) and submitted to the applicable RDC. Depending on the number of data sets being submitted, the applicable RDC may not be able to load the data into their database and subsequently send the data to CEDEN immediately.

Once the solicitation period has closed and the data sets loaded, the data used for assessment will also be made available on this page. Note that the query used will rely on sample date being greater than the end date of the previous solicitation period (August 2010).

If you would like to submit data to be assessed, please see the “Submit Data” page to get started.

Preparing your data to meet CEDEN requirements can be time consuming and the vocabulary request process can take several weeks of processing time, so please plan accordingly.

If you have any questions about CEDEN, please email ceden@waterboards.ca.gov. If you have questions about the 303(d) report or Listing Policy, please see the Impaired Water Bodies page or email WQAssessment@waterboards.ca.gov.


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