Water Quality Assessment

The Federal Clean Water Act (CWA) gives States the primary responsibility for protecting and restoring surface water quality. Under the CWA, States that administer the CWA must review, make necessary changes, and submit the CWA section 303(d) list to the U.S. Environmental Protection Agency (U.S.EPA). CWA Section 305(b) requires each State to report biennially to U.S.EPA, on the condition of its surface water quality. The U.S.EPA has issued guidance to States which requires the two reports to be integrated. For California, this combined report is called the California 303(d)/305(b) Integrated Report.

For 303(d), State and Regional Water Boards assess water quality monitoring data for California’s surface waters every two years to determine if they contain pollutants at levels that exceed protective water quality standards. Water body and pollutants that exceed protective water quality standards are placed on the State’s 303(d) List. This determination in California is governed by the Water Quality Control Policy for developing California’s Clean Water Act Section 303(d) List. U.S.EPA must approve the 303(d) List before it is considered final.

Placement of a water body and pollutant that exceeds protective water quality standards on the 303(d) List, initiates the development of a Total Maximum Daily Load (TMDL). In some cases other regulatory programs will address the impairment instead of a TMDL.

For 305(b) Report, State and Regional Water Boards place the water body segment that were assessed into one of U.S.EPA’s five Integrated Report beneficial use report category. For this assessment available data are used to evaluate most common beneficial uses including aquatic life, drinking water supply, fish consumption non-contact recreational, and swimming.

Announcements

Colorado River Salinity

The Colorado River Salinity Control Forum has released its 2014 Review, Water Quality Standards for Salinity, Colorado River System report, and is available at the Forum’s website at www.coloradoriversalinity.org. The Forum will accept public comments through September 15, 2014. Comments should be addressed to the Forum’s Executive Director, Don Barnett at email to dbarnett@barnettwater.com or by regular mail at:

Colorado River Basin Salinity Control Forum
106 W. 500 S., Suite 101
Bountiful, UT 84010

Questions should be addressed to Executive Director Barnett at (801) 292-4663

After approval by the forum, the report will be considered by the State Water Resources Control Board for its approval as well as by water quality agencies in other Colorado River Basin States.

Water Quality Goals

• California Integrated Report – includes the Clean Water Act Section 303(d) List and Section 305(b) Report.
• A Compilation of Water Quality Goals
  Numeric water quality thresholds from the literature for over 860 chemical constituents and water quality parameters. The text of the report explains, with examples, how these thresholds may be used to assess protection of beneficial uses of water resources in the context of California's quality standards. A summary of relevant statutes, regulations, plans, and policies and links to original references are included.

Statewide Mercury Program

• Statewide Mercury Program - Addressing Mercury in California's Waters

TMDL - Total Maximum Daily Load Program

• TMDL - Total Maximum Daily Load Program
  
  

Impaired Water Bodies

• Integrated Reports
  
  • NEW! 2018 Integrated Report Notice of Solicitation - with process for submitting data that cannot be accepted into CEDEN
    • NEW! Submittal Form for non-CEDEN compatible data
  • 2014/2016 Integrated Report (CWA Section 303(d) List / 305(b) Report)
  • 2012 Integrated Report (CWA Section 303(d) List / 305(b) Report)
    On July 30, 2015, the U.S. EPA issued its final decision regarding the waterbodies and pollutants added to California's 303(d) List. This replaces the 2010 California Clean Water Act section 303(d) List as California's current 303(d) List.
  • Integrated Report Status Update
  • Letter to U.S.EPA dated July 15, 2013
  • 2010 Integrated Report (CWA Section 303(d) List / 305(b) Report)
    On October 11, 2011, the U.S.EPA issued its final decision regarding the water bodies and pollutants added to California's 303(d) List. This replaces the 2006 California Clean Water Act 303(d) List as California's current 303(d) List.
  • Previous 303(d) Lists and 305(b) Reports
    The 2010 Integrated Report is the first Integrated Report developed for the State of California. Previous assessments were developed by the State Water Board in separate documents and can be found at the following links:
    • Previous Clean Water Act Section 303(d) Lists
      • 2006 |  2002 |  1998 |  1996 |  1994 |  1992 |  1990 |  1988 |  1986 |  1984 |  1982 |  1980 |  1978 |  1976
    • Previous Clean Water Act Section 305(b) Reports
      • 2006 |  2002
      • Earlier 305(b) Reports are not available in digital format. These reports can be requested through the Public Records Center
  • Listing-Delisting Policy
    • Listing Policy Amendment - Sediment Quality Objectives
    • Listing Policy Binomial Tables Expanded
      

(Updated 4/13/17)