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 | Detected |
| VENTURA CWWD NO. 1 - MOORPARK | MOORPARK, CA | 35,514 | 0 | Detected |
| 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 | Detected |
| CITY OF LATHROP | LATHROP, CA | 35,080 | 124 | Detected |
| GOLDEN STATE WATER COMPANY - ORCUTT | HAWTHORNE, CA | 34,102 | 2 | Detected |
| HEMET, CITY OF | HEMET, CA | 33,828 | 53 | Detected |
| COVINA-CITY, WATER DEPT. | COVINA, CA | 33,300 | 9 | Detected |
| 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 | Detected |
| GOLDEN STATE WATER CO - BARSTOW | APPLE VALLEY, CA | 32,547 | 2 | Detected |
| EAST NILES CSD | BAKERSFIELD, CA | 32,517 | 47 | Detected |
| 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 | Detected |
| 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 | Detected |
| 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 | Detected |
| 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 | Detected |
| 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 | Detected |
| CITY OF SANGER | SANGER, CA | 26,357 | 18 | Detected |