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.
| 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 | Detected |
| LIBERTY UTILITIES (AV RANCHOS) CORP. | DOWNEY, CA | 64,469 | 2 | Detected |
| PARK MOABI | SAN BERNARDINO, CA | 64,267 | 2 | — |
| CALIFORNIA WATER SERVICE-S SAN FRANCISCO | SAN JOSE, CA | 64,146 | 8 | Detected |
| GSWC - FLORENCE/GRAHAM | ANAHEIM, CA | 63,500 | 2 | Detected |
| PORTERVILLE, CITY OF | PORTERVILLE, CA | 63,164 | 6 | Detected |
| CITY OF LA HABRA | LA HABRA, CA | 63,118 | 101 | Detected |
| CITY OF PITTSBURG | PITTSBURG, CA | 62,500 | 5 | Detected |
| 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 | Detected |
| 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 | Detected |
| MONTE VISTA WD | MONTCLAIR, CA | 56,017 | 27 | Detected |
| PARAMOUNT - CITY, WATER DEPT. | PARAMOUNT, CA | 55,200 | 7 | Detected |
| 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 | Detected |
| 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 | Detected |
| DELANO, CITY OF | DELANO, CA | 51,428 | 83 | Detected |
| 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 | Detected |
| UC - DAVIS | DAVIS, CA | 49,616 | 10 | Detected |
| CITY OF BREA | BREA, CA | 48,479 | 3 | Detected |
| CAL AM - LINCOLN OAKS | SACRAMENTO, CA | 48,094 | 2 | Detected |