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TMDL and 303(d) List - The 303(d) List of Impaired Water Bodies

The Integrated Report - 303(d) List of Water Quality Limited Segments and 305(b) Surface Water Quality Assessment

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Section 303(d) of the Clean Water Act requires the identification of water bodies that do not meet, or are not expected to meet, water quality standards (i.e., impaired water bodies). The affected water body, and associated pollutant or stressor, is then prioritized in the 303(d) List. The Clean Water Act further requires the development of a Total Maximum Daily Load (TMDL) for each listing.  In 2008, California began integrating the 303(d) List of Impaired Waters and the 305(b) Water Quality Assessment Report into a single report (Integrated Report).  This Integrated Report will satisfy the requirements of both CWA Sections 303(d) and 305(b). 

For questions or additional information, please contact Jay Simi at (916) 464-4833 or by email at jsimi@waterboards.ca.gov.

NEW! - Central Valley Water Board approves recommended changes to the 303(d) List for the Central Valley Region

On December 5, 2016 the Central Valley Water Board approved staff's recommended changes to the 303(d) List. The following information supports the Central Valley Water Board approval process. On December 20, 2016 the Central Valley Water Board submitted the approved 303(d) List to the State Water Board. Note, this 2014 303(d) List does not replace the current EPA approved 303(d) List until both the State Water Board and EPA approve these changes.

2012 Integrated Report – 303(d) List & 305(b) Report

The 2012 303(d) List contains updates for three Regional Water Boards (North Coast, Lahontan, and Colorado River Basin) as well as the carryover decisions from the previously approved 2008/2010 303(d) Lists for the other six Regional Water Boards (including the Central Valley).

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.

2008 - 2010 303(d) List of Water Quality Limited Segments – The CURRENT 303(d) List

Statewide 2008 - 2010 303(d) List

On 12 November 2010, USEPA approved California’s 2008-2010 Section 303(d) List of Impaired Waters and disapproved the omission of several water bodies and associated pollutants that meet federal listing requirements.  On October 11, 2011, USEPA issued its final decision regarding the waters USEPA added to the State’s 303(d) list.  USEPA provided public notice and solicited public comment on its identification of additional water bodies and associated pollutants for inclusion on California's List.  The final list of water bodies that EPA is adding to California's list of water quality limited segments still requiring a TMDL includes all the water bodies and associated pollutants identified in USEPA's November 12, 2010 letter, with the exception of San Joaquin River (Mendota Pool to Bear Creek) for electrical conductivity.

The 2006 303(d) List of Water Quality Limited Segments and Previous 303(d) List Updates

Information for the (2006) 303(d) List

Information on the 2002 303(d) List

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--Web page updated 02/03/2017