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 |
|---|---|---|---|---|
| Fair Oaks Water District | Fair Oaks, CA | 36,226 | 0 | Clean |
| Aguanga Market Water System | Aguanga, CA | 36,012 | 3 | - |
| Stanford University | Stanford, CA | 35,853 | 8 | Clean |
| Crescenta Valley Cwd | La Crescenta, CA | 35,841 | 9 | Detected |
| Cal Am - Antelope | Sacramento, CA | 35,534 | 1 | Clean |
| Ventura Cwwd No. 1 - Moorpark | Moorpark, CA | 35,514 | 0 | Clean |
| Lakeside WD | Lakeside, CA | 35,500 | 14 | Detected |
| California Water Service - San Carlos | San Jose, CA | 35,344 | 8 | Clean |
| Fallbrook PUD | Fallbrook, CA | 35,237 | 1 | Clean |
| City of Lathrop | Lathrop, CA | 35,080 | 124 | Detected |
| Golden State Water Company - Orcutt | Hawthorne, CA | 34,102 | 2 | Clean |
| Hemet, City Of | Hemet, CA | 33,828 | 53 | Clean |
| Covina-City, Water Dept. | Covina, CA | 33,300 | 9 | Clean |
| Cuyamaca Water District | Julian, CA | 33,030 | 25 | - |
| Camrosa Water District | Camarillo, CA | 32,700 | 7 | Detected |
| Manhattan Beach-City, Water Dept. | Manhattan Beach, CA | 32,697 | 4 | Clean |
| Golden State Water Co - Barstow | Apple Valley, CA | 32,547 | 2 | Detected |
| East Niles Csd | Bakersfield, CA | 32,517 | 47 | Clean |
| Los Angeles Cwwd 29 & 80-Malibu | Alhambra, CA | 32,348 | 10 | - |
| Banning, City Of | Banning, CA | 31,680 | 23 | Detected |
| City of Burlingame | Burlingame, CA | 31,451 | 9 | Clean |
| La Verne, City WD | La Verne, CA | 31,334 | 10 | Clean |
| City of Paso Robles Water Division | Paso Robles, CA | 31,176 | 9 | Detected |
| City of Santa Paula | Santa Paula, CA | 31,018 | 4 | Clean |
| City of Martinez | Martinez, CA | 30,997 | 3 | Clean |
| Scwa Mather-Sunrise | Sacramento, CA | 30,825 | 5 | Clean |
| Rincon del Diablo MWD (ID-1) | Escondido, CA | 30,757 | 7 | Detected |
| Atascadero Mutual Water Co | Atascadero, CA | 30,618 | 3 | Detected |
| Mid-Peninsula Water District | Belmont, CA | 30,609 | 6 | Clean |
| Valley Center MWD | Valley Center, CA | 29,938 | 7 | Clean |
| Calif State Polytechnical Univ - Pomona | Pomona, CA | 29,854 | 33 | - |
| San Juan Water District | Granite Bay, CA | 29,598 | 2 | Clean |
| City of East Palo Alto | East Palo Alto, CA | 29,519 | 23 | Clean |
| City of Atwater | Atwater, CA | 29,479 | 19 | Detected |
| Suisun-Solano Water Authority | Vacaville, CA | 29,105 | 24 | Clean |
| Vernon-City, Water Dept. | Vernon, CA | 28,112 | 6 | Clean |
| Yoga Center Mother's Kitchen | Palomar Mountain, CA | 27,884 | 41 | - |
| Placer Cwa - Auburn/Bowman | Auburn, CA | 27,294 | 0 | Clean |
| Lemoore, City Of | Lemoore, CA | 27,185 | 124 | Clean |
| City of Benicia | Benicia, CA | 27,131 | 7 | Detected |
| Eureka, City Of | Eureka, CA | 27,078 | 2 | Clean |
| Gswc-South Arcadia | San Dimas, CA | 27,072 | 3 | Detected |
| Brawley, City Of | Brawley, CA | 26,862 | 23 | Clean |
| San Diego Mountain Lodge | San Diego, CA | 26,641 | 16 | - |
| Montebello Land & Water Co. | Montebello, CA | 26,554 | 9 | Detected |
| Galt, City Of | Galt, CA | 26,536 | 47 | - |
| Cws - Selma | San Jose, CA | 26,517 | 2 | Clean |
| HI Desert WD | Yucca Valley, CA | 26,411 | 17 | Detected |
| Liberty Utilities - Compton | Downey, CA | 26,371 | 7 | Clean |
| City of Sanger | Sanger, CA | 26,357 | 18 | Detected |