|Locat Sections Boundary Descriptions
|CENTRAL SAN JOAQUIN
||Fresno, Kings, Madera and Tulare
Counties, in the Central Valley Region of the SWRCB
|Monterey, Santa Cruz, San Benito
Counties, plus the portion of Santa Clara County
south of Coyote.
||Del Norte, Humboldt, Trinity
Counties, plus the portions of Siskiyou county west
of the north-south line from the northern most point
of Trinity County and at least 5 miles west of Highway
I-5, plus the portion of Mendocino County north
of Highway 20.
|NORTHERN SAN JOAQUIN
|Amador, Calaveras, Mariposa,
Merced, San Joaquin, Stanislaus, Tuolumne Counties.
|NORTH SACRAMENTO VALLEY
||Butte, Colusa, Glenn, Lassen,
Modoc, Plumas, Shasta, Sierra, Sutter, Tehama, Yuba,
Yolo counties, plus the portion of Siskiyou County
east of the north-south line from the northern most
point of Trinity County and at least 5 miles west
of Highway I-5, and the portion of Nevada County
in the Central Valley Region of the SWRCB regions.
||Lake, Marin, Napa, Sonoma Counties, plus the portions of Mendocino County south of Highway 20, and that portion of Solano County west of Highway 680 and north of Highway 12.
||.Sacramento County, plus the portions of El Dorado and Placer Counties in the Central Valley Region of the SWRCB regions and the portion of Solano County south of Highway 12 and east of Highway 680.
|SANTA CLARA VALLEY
||The portion of Santa Clara County
north of Coyote and the portion of San Mateo County
south of an east-west line from the Pacific Ocean
to the Alameda County boundary just north of Millbrae.
|SAN FRANCISCO BAY
||Alameda, Contra Costa and San
Francisco Counties, plus the portion of San Mateo
County north of the east-west line from the Pacific
ocean to the Alameda County boundary.
||Alpine County, plus the portions
of El Dorado, Mono, Nevada, and Placer Counties
in the Northern Lahontan Region (north of Highway
167) of the SWRCB regions.
|COLORADO RIVER BASIN
||Imperial County plus portions of San Diego, Riverside and San Bernardino Counties. North boundary is Banning (inclusive) to Yucca Valley to Twentynine Palms to Amboy to Needles. East boundary is Needles to Yuma. South boundary is Yuma to San Diego county line. West boundary is San Diego County line to Highway 52 to Highway 79 to Highway 371 to Highway 74 to Highway 243 to Banning. (Anza-Borrego area, including Borrego Springs, is within the CORBS boundaries.)
|DESERT AND MOUNTAIN
|Inyo County plus portions of San Bernardino, and Mono Counties in the Southern Lahontan Region of the SWRCB. (Big Bear, Running Springs, Lake Arrowhead, and Crestline are within the Desert and Mountain Boundaries).
|LOS ANGELES BASIN
||Los Angeles County.
|SANTA ANA RIVER BASIN
||Orange County plus portions of
San Diego and Riverside counties. North boundary
is Los Angeles County line to Highway 10 to Highway
38. East boundary is from Highway 38 through Yucaipa
to Beaumont to Highway 40 to Highway 243 to Highway
74 to Hemet to Highway R3 to San Diego County line.
South boundary is Orange County line. (San Bernardino,
Redlands, Yucaipa, San Jacinto, Idlywild, and Hemet
are with the SARBS boundaries.
||Portions of San Diego County.
North boundary is San Diego County line south of
San Clemente, east to Highway 79. East boundary
is Highway 79 to Highway 52 to San Diego County
line at Coyote Wells and follows County line to
U.S./Mexico Border. (Anzo Borrego area, including
Borrego Springs are not within San Diego Boundaries.)
||San Luis Obispo, Santa Barbara
and Ventura Counties.