Total Maximum Daily Load (TMDL) and the 303(d) List of Impaired Water Bodies

2012 303(d) List

On July 30, 2015, the U.S. EPA issued its final approval to California’s 2012 Section 303(d) List. This replaces the 2010 California’s 2010 303(d) List.

Proposed revisions to the 303(d) list for the Colorado River Basin
The Regional Board has opened a public comment period on proposed revisions to the 303(d) list of impaired water bodies in the Colorado River Basin. The comment period will close on March 7, 2014. The Regional Board Hearing on the proposed revisions is scheduled for March 20, 2014. At this hearing, the Regional Board will consider for approval each proposed listing change and will consider adoption of a Resolution in support of its recommendations to the State Water Resources Control Board (State Board) for the statewide 2012 303(d) list. The following documents are available for review and comment:

On March 20, 2014 in Brawley, Colorado River Basin Water Board Adopted Resolution R7-2014-0025.

2010 303(d) List

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.

Proposed revisions to the 303(d) list for the Colorado River Basin
The Regional Board has opened a public comment period on proposed revisions to the 303(d) list of impaired water bodies in the Colorado River Basin. The comment period will close on January 9, 2009. The Regional Board Hearing on the proposed revisions is scheduled for January 22, 2009. At this hearing, the Regional Board will consider for approval each proposed listing change and will consider adoption of a Resolution in support of its recommendations to the State Water Resources Control Board (State Board) for the statewide 2008 303(d) list. The following documents are available for review and comment:

See the fact sheets which include links to the supporting data. They are organized by the listing decision and water body name. Please close these files to return here.

On January 22, 2009 in El Centro, CA the Regional Board adopted Resolution R7-2009-0014.

On June 28, 2007, USEPA gave final approval to California's 2006 Section 303(d) List of Water Quality Limited Segments. The approved 303(d) List for the Colorado River Basin Region contains the Region's impaired surface water bodies, hydrologic unit number, the number of affected miles, sources of pollution, and timeline for TMDL development.

Questions or Comments?

For more information, please visit the State Water Board’s web pages for the TMDL Program and Impaired Water Bodies.

Region 7 Contact for the 303(d) List:
Rosalyn Fleming, WRC Engineer
Email: Rosalyn.Fleming@waterboards.ca.gov
Phone: (760)776-8948