PlainWater

Public Water Systems

7,249 active public water systems in CA, tracked from EPA's Safe Drinking Water Information System (SDWIS) across all 50 states. See our methodology.

Population Violations Health Violations Name
System Name Location Population Violations PFAS
Suburban Water Systems-Whittier Covina, CA 66,045 4 Detected
Watsonville, City Of Watsonville, CA 65,231 2 Detected
Brentwood Brentwood, CA 64,513 41 Clean
Liberty Utilities (Av Ranchos) Corp. Downey, CA 64,469 2 Clean
Park Moabi San Bernardino, CA 64,267 2 -
California Water Service-S San Francisco San Jose, CA 64,146 8 Clean
Gswc - Florence/Graham Anaheim, CA 63,500 2 Clean
Porterville, City Of Porterville, CA 63,164 6 Detected
City of la Habra La Habra, CA 63,118 101 Clean
City of Pittsburg Pittsburg, CA 62,500 5 Clean
Monterey Park-City, Water Dept. Los Angeles, CA 62,183 9 Detected
Hanford, City Of Hanford, CA 62,127 454 Clean
North Marin Water District Novato, CA 61,691 6 Clean
City of Woodland Woodland, CA 61,462 4 Clean
California Water Service - Bear Gulch San Jose, CA 61,431 9 Clean
Petaluma, City Of Petaluma, CA 60,781 4 Clean
California Water Service - Livermore San Jose, CA 60,414 2 Detected
City of Gilroy Gilroy, CA 59,203 2 Detected
Goose Creek Golf Club Mira Loma, CA 57,628 24 -
Suburban Water Systems-la Mirada Covina, CA 56,793 0 Detected
City of Fountain Valley Fountain Valley, CA 56,747 8 Detected
Gswc-San Dimas San Dimas, CA 56,538 5 Detected
Alco Water Service Salinas, CA 56,253 15 Clean
Monte Vista WD Montclair, CA 56,017 27 Detected
Paramount - City, Water Dept. Paramount, CA 55,200 7 Clean
Gswc - Bell, Bell Gardens Anaheim, CA 54,877 8 Detected
Cal Am - Suburban Rosemont Sacramento, CA 54,793 4 Detected
Rowland Water District Rowland Heights, CA 54,660 4 Detected
City of Lincoln Lincoln, CA 54,538 0 Detected
Ceres, City Of Ceres, CA 54,513 28 Detected
Rialto, City Of Rialto, CA 54,453 6 Detected
City of West Sacramento West Sacramento, CA 53,355 4 Clean
City of Thousand Oaks Water Department Thousand Oaks, CA 53,157 0 Clean
Lake Hemet MWD Hemet, CA 52,913 8 Clean
Yucaipa Valley Water District Yucaipa, CA 52,010 19 Detected
El Toro Water District Lake Forest, CA 51,800 1 Detected
City of San Clemente San Clemente, CA 51,545 4 Clean
Delano, City Of Delano, CA 51,428 83 Clean
City of Arcadia Arcadia, CA 51,361 17 Detected
Cal Am - Parkway Sacramento, CA 50,573 3 Detected
Robinson Creek Campground Sparks, CA 50,562 22 -
Golden State WC - Placentia/Yorba Linda Anaheim, CA 50,381 0 Detected
Gswc - Artesia Anaheim, CA 50,375 5 Detected
Santa Margarita Recreation Area San Luis Obispo, CA 50,001 0 -
Whittier-City, Water Dept. Whittier, CA 49,954 0 Clean
Glendora-City, Water Dept. Glendora, CA 49,934 4 Clean
Poway, City Of Poway, CA 49,888 4 Clean
Uc - Davis Davis, CA 49,616 10 Clean
City of Brea Brea, CA 48,479 3 Clean
Cal Am - Lincoln Oaks Sacramento, CA 48,094 2 Detected
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