(a) North Sacramento Valley District includes and consists of Glenn County, Shasta County, Tehama County, Modoc County, Siskiyou County, Lassen County, Plumas County, and Colusa County.

(b) Central Sacramento Valley District includes and consists of Sutter County, Butte County, Yuba County, and Sierra County.

(c) Sacramento River District includes and consists of Sacramento County, that portion of Yolo County east of a straight line from the northwest corner of Sacramento County to the Northeast corner of Solano County, and that portion of Solano County east of a straight line from the northeast corner of Solano County to the town of Rio Vista.

(d) El Dorado District includes and consists of El Dorado County.

(e) Placer-Colfax District includes and consists of Nevada and Placer Counties.

(f) Solano District includes and consists of that portion of Yolo County not included in the Sacramento River District, and that portion of Solano County not included in the Sacramento River District.

(g) Contra Costa District includes and consists of Contra Costa County.

(h) Santa Clara District includes and consists of Alameda County, Monterey County, Santa Clara County, San Mateo County, Santa Cruz County, and San Benito County.

(i) Lake District includes and consists of Lake County.

(j) Mendocino District includes and consists of Mendocino County, Humboldt County, Trinity County, and Del Norte County.

(k) South Coast District includes and consists of San Luis Obispo County, Santa Barbara County, and Ventura County.

(l) Stockton District includes and consists of San Joaquin County, Amador County, Calaveras County, and Alpine County.

(m) Stanislaus District includes and consists of Merced County, Stanislaus County, Tuolumne County, and Mariposa County.

(n) Fresno District includes and consists of Madera County, Fresno County, and Mono County.

(o) Tulare District includes and consists of Tulare County and Kings County.

(p) Kern District includes and consists of that portion of Kern County west of the Tehachapi Mountains.

(q) Tehachapi District includes and consists of that portion of Kern County not included in Kern District, and Inyo County.

(r) Southern California District includes and consists of San Bernardino County, Orange County, San Diego County, Imperial County, Riverside County, and Los Angeles County.

(s) North Bay District includes and consists of Sonoma County, Napa County, and Marin County.