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California Regional Water Boards


The California Regional Water Boards address local water issues in California.
From Wikipedia:
“The nine semi-autonomous Regional Water Boards were created in 1949 by the Dickey Water Pollution Act and have been responsible for protecting the surface, ground and coastal waters of their regions since then.
In adopting the Dickey Act the Legislature was acknowledging that California’s water pollution problems are regional, and are affected by rain and snowfall, the configuration of the land, and population density, as well as recreational, agricultural, urban and industrial development, all of which vary from region to region.
The Regional Water Boards develop basin plans for their natural geographic characteristics that affect the overland flow of water in their area, govern requirements for and issue waste discharge permits, take enforcement action against dischargers who violate permits or otherwise harm water quality in surface waters, and monitor water quality. 
The Regional Water Boards are unusual in this state because their boundaries follow natural mountain chains and ridges that define watersheds rather than political boundaries.”

Geographic Jurisdiction

  • Region 1 — North Coast Regional Water Quality Control Board: Del Norte, Glenn, Humboldt, Lake, Marin, Mendocino, Modoc, Siskiyou, Sonoma, and Trinity counties.
  • Region 2 — San Francisco Regional Water Quality Control Board: Alameda, Contra Costa, San Francisco, Santa Clara (north of Morgan Hill), San Mateo, Marin, Sonoma, Napa, Solano counties.
  • Region 3 — Central Coast Regional Water Quality Control Board: Santa Clara (south of Morgan Hill), San Mateo (southern portion), Santa Cruz, San Benito, Monterey, Kern (small portions), San Luis Obispo, Santa Barbara, Ventura (northern portion) counties.
  • Region 4 — Los Angeles Regional Water Quality Control Board: Los Angeles, Ventura counties, (small portions of Kern and Santa Barbara counties).
  • Region 5 — Central Valley Regional Water Quality Control Board: Modoc, Shasta, Lassen, Plumas, Butte, Glen, Colusa, Lake, Sutter, Yuba, Sierra, Nevada, Placer, Yolo, Napa, (N. East), Solano (West), Sacramento, El Dorado, Amador, Calaveras, San Joaquin, Contra Costa (East), Stanislaus, Toulumne, Merced, Mariposa, Madera, Kings, Fresno, Tulare, Kern. (Very small portions of San Benito, San Luis Obispo) counties.
  • Region 6 — Lahontan Regional Water Quality Control Board: Modoc (East), Lassen (East side and Eagle Lake), Sierra, Nevada, Placer, El Dorado, Alpine, Mono, Inyo, Kern (East), San Bernardino, Los Angeles (N/E corner) counties.
  • Region 7 — Colorado River Regional Water Quality Control Board: Imperial, San Bernardino, Riverside, San Diego counties.
  • Region 8 — Santa Ana Regional Water Quality Control Board: Orange, Riverside, San Bernardino counties.
  • Region 9 — San Diego Regional Water Quality Control Board: San Diego, Imperial, Riverside counties. 

Activities Regulated

The regional water quality control boards provide local support for regulatory programs of the State Water Resource Control Board.


Complyrs offers the following programs that are regulated in whole or in part by the SWRCB:


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