Subtopics
Alameda
Alpine
Amador
Butte
Calaveras
Colusa
Contra Costa
Del Norte
El Dorado
Fresno
Glenn
Humboldt
Imperial
Inyo
Kern
Kings
Lake
Lassen
Los Angeles
Madera
Marin
Mariposa
Mendocino
Merced
Modoc
Mono
Monterey
Napa
Nevada
Orange
Placer
Plumas
Riverside
Sacramento
San Benito
San Bernardino
San Diego
San Francisco
San Joaquin
San Luis Obispo
San Mateo
Santa Barbara
Santa Clara
Santa Cruz
Shasta
Sierra
Siskiyou
Solano
Sonoma
Stanislaus
Sutter
Tehama
Trinity
Tulare
Tuolumne
Ventura
Yolo
Yuba

See also
Alturas
Bakersfield
Basin and Range basin-fill aquifers
Basin and Range carbonate-rock aquifers
Black Rock Desert-Humboldt
California Coastal Basin aquifers
Central California Coastal
Central Lahontan
Central Nevada Desert Basins
Central Valley aquifer system
Chico
Death Valley
El Centro
Eureka
Fresno
Goldfield
Kingman
Klamath Falls
Klamath-Northern California Coastal
Las Vegas
Long Beach
Los Angeles
Lovelock
Lower Colorado
Mariposa
Medford
Monterey
Needles
North Lahontan
Northern Mojave-Mono Lake
Oregon closed basins
Oregon-Washington Coastal
Pacific Northwest basaltic-rock aquifers
Pacific Northwest basin-fill aquifers
Redding
Reno
Sacramento
Sacramento
Salton Sea
San Bernardino
San Clemente Island
San Diego
San Francisco
San Francisco Bay
San Joaquin
San Jose
San Luis Obispo
Santa Ana
Santa Maria
Santa Rosa
Southern California Coastal
Southern Mojave-Salton Sea
Susanville
Trona
Tulare-Buena Vista Lakes
Ukiah
Vya
Walker Lake
Weed