- Albion River
- Big River
- Eel River, North Fork
- Eel River, Upper Main
- Eel River, Middle Fork
- Eel River, South Fork
- Elk River
- Freshwater Creek
- Garcia River
- Gualala River
- Klamath River
- Laguna De Santa Rosa
- Lost River, Upper
- Lost River, Lower
- Mattole River
- Navarro River
- Noyo River
- Redwood Creek
- Russian River
- Salmon River
- Scott River
- Shasta River
- Stemple Creek
- Ten Mile River
- Trinity River
- Trinity River, South Fork
- Van Duzen River
The 303(d) List of Impaired Waterbodies
California's 303(d) List of Impaired Waterbodies
- 2006 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENTS - 1Mb PDF – June 28, 2007
- Letter re: Klamath River Microcystin Toxin Impairment – May 29, 2008
- EPA’s Responsiveness Summary Re: Klamath Microcystin Listing – May 29, 2008
- EPA’s Staff Report Re: Klamath Microcystin Listing – March 13, 2008
Other Links
- Letter re: Approval of 2006 303(d) List from US EPA to Water Boards – June 28, 2007
- State Water Board Resolution No. 2006-0079 Approving the 2006 303(d) List – Oct. 25, 2006
- More information on the 303(d) List from the US EPA (note: hosted on US EPA’s website)
What is the 303(d) List?
Section 303(d) of the federal Clean Water Act and 40 CFR §130.7 require states to identify waterbodies that do not meet water quality standards and are not supporting their beneficial uses. These waters are placed on the Section 303(d) List of Impaired Waterbodies. The List identifies the pollutant or stressor causing impairment and establishes a schedule for developing a control plan to address the impairment.
Placement on this list triggers development of a pollution control plan called a Total Maximum Daily Load (TMDL) for each waterbody and associated pollutant/stressor on the list. The TMDL serves as the means to attain and maintain water quality standards for the impaired waterbody. During each 303(d) listing cycle the waterbodies on the list are prioritized and a schedule is established for completing the TMDLs.
Current 303(d) List
The current 303(d) List is commonly known as the 2006 List since that was the year of the last major update. Since that time, several water bodies have been added to the list. The most recent addition is for the reach of the mainstem Klamath River from the Copco 1 Reservoir to Iron Gate Dam for microcystin toxins, which was added May 29, 2008, by the US EPA.
2008 Integrated Water Quality Report
California must submit an updated 303(d) List to the US EPA every two years. The 2008 update is currently underway. Regional Water Board staff are actively analyzing available data, including data submitted by interested parties (data submitted after February 28, 2007, will be considered as part of the 2010 listing process).
New for the 2008 update is the combination of the 303(d) List with the surface water quality assessment that is performed every two years according to Section 305(b) of the Clean Water Act. Thus, the report will be called the 2008 Integrated Water Quality Report.
The Public Review Draft 2008 Integrated Report should be available in Fall 2008. The Regional Water Board will consider adopting the 2008 Integrated Report in late 2008 or early 2009. Following Regional Water Board adoption, it will be considered by the State Water Resources Control Board. Following State Water Board approval, it will be considered by the US EPA.
Contact Information
Lead Staff:
Rebecca Fitzgerald, Environmental Scientist
707-576-2650
rfitzgerald@waterboards.ca.gov
Page Updated: June 10, 2008