State and Regional Water Boards

The interactive Water Boards map is currently being upgraded. Please use the dropdown menu to visit each regional board's website. * State Water Resources Control Board * The Nine Regional Water Quality Control Boards in California - Fact Sheet (.pdf)
(View the Regional Boards' websites. See the map below.) * State and Regional Water Boards Brochure (.pdf) * California Regional Water Quality Control Boards - A list of the Regional Boards, their addresses, main telephone and fax numbers. * Regional Water Quality Control Boards --Select-- North Coast - Region 1 San Francisco Bay - Region 2 Central Coast - Region 3 Los Angeles - Region 4 Central Valley - Region 5 Lahontan - Region 6 Colorado River - Region 7 Santa Ana - Region 8 San Diego - Region 9 (Page last updated 03/16/2026) Water is a precious resource in California, and maintaining its quality is of utmost importance to safeguard the health of the public and the environment.

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The State Water Board is one of six environmental entities operating under
the authority of the California Environmental Protection Agency
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