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 |
|---|---|---|---|---|
| PROVIDENCE MTNS SRA | HESPERIA, CA | 3,203 | 2 | — |
| RANCHO LOS AMIGOS HOSPITAL | ALHAMBRA, CA | 3,200 | 4 | Detected |
| BLM-BRICEBURG WATER SYSTEM | MIDPINES, CA | 3,196 | 8 | — |
| VALLEY STATE PRISON | CHOWCHILLA, CA | 3,173 | 68 | — |
| MADERA CO MD10A-MADERA RANCHOS | MADERA, CA | 3,172 | 12 | — |
| CWSC OAK HILLS | SAN JOSE, CA | 3,161 | 9 | Detected |
| BURNEY WATER DISTRICT | BURNEY, CA | 3,154 | 43 | — |
| PLACER CWA - COLFAX | AUBURN, CA | 3,149 | 0 | — |
| CITY OF NEVADA CITY | NEVADA CITY, CA | 3,148 | 5 | — |
| AMARILLO MUTUAL WATER COMPANY | ROSEMEAD, CA | 3,134 | 42 | — |
| SAN ANTONIO WATER COMPANY | UPLAND, CA | 3,111 | 7 | Clean |
| HOME GARDENS COUNTY WD | CORONA, CA | 3,095 | 176 | — |
| SHASTA C.S.D. | SHASTA, CA | 3,069 | 0 | — |
| MARYGOLD MWC | BLOOMINGTON, CA | 3,055 | 5 | — |
| LITTLEROCK CREEK IRRIGATION DIST. | LITTLEROCK, CA | 3,040 | 12 | Clean |
| HIGH DESERT DETENTION CENTER | ADELANTO, CA | 3,035 | 0 | — |
| PETITE PANTRY | BISHOP, CA | 3,012 | 35 | — |
| WILD WATER ADVENTURES | CLOVIS, CA | 3,000 | 19 | — |
| CALTRANS-BORON REST STOP WATER SYSTEM | BISHOP, CA | 3,000 | 30 | — |
| KNOTT S BERRY FARM | BUENA PARK, CA | 3,000 | 10 | — |
| EL CAMINO HOSPITAL | MOUNTAIN VIEW, CA | 3,000 | 5 | — |
| SANTA CLARA VALLEY MEDICAL CENTER | SAN JOSE, CA | 3,000 | 21 | — |
| SWEETWATER SPRINGS CWD - MONTE RIO | GUERNEVILLE, CA | 3,000 | 0 | — |
| CASILLAS WATER SYSTEM | PORTERVILLE, CA | 3,000 | 2 | — |
| SMITH FORKS WATER SYSTEM | LANCASTER, CA | 3,000 | 2 | — |
| CCI - TEHACHAPI | TEHACHAPI, CA | 2,993 | 22 | Detected |
| GREEN VALLEY MWC | GREEN VALLEY LAKE, CA | 2,993 | 15 | — |
| AROMAS WATER DISTRICT | AROMAS, CA | 2,988 | 7 | — |
| NAVAL MEDICAL CENTER SAN DIEGO | CA | 2,981 | 0 | — |
| HERITAGE RANCH CSD | PASO ROBLES, CA | 2,956 | 38 | Clean |
| NPS-GRANT GROVE | THREE RIVERS, CA | 2,950 | 9 | — |
| NPS-WOLVERTON | THREE RIVERS, CA | 2,940 | 278 | — |
| SALINAS VALLEY STATE PRISON | SOLEDAD, CA | 2,930 | 8 | Clean |
| NPS-ASH MOUNTAIN | THREE RIVERS, CA | 2,930 | 7 | — |
| NICE MUTUAL WATER COMPANY | NICE, CA | 2,929 | 6 | — |
| NORTHGATE 880 [SWS] | SACRAMENTO, CA | 2,926 | 2 | — |
| SUTTER COMMUNITY S.D. | SUTTER, CA | 2,904 | 13 | — |
| NPS-SHEEP CREEK | THREE RIVERS, CA | 2,900 | 10 | — |
| PALO ALTO PARK MUTUAL WATER COMPANY | EAST PALO ALTO, CA | 2,900 | 9 | — |
| NPS-PINEWOOD WATER SYSTEM | THREE RIVERS, CA | 2,900 | 2 | — |
| JUNE LAKE PUD - DOWN CANYON | JUNE LAKE, CA | 2,810 | 29 | — |
| LERDO SHERIFF S FACILITY | BAKERSFIELD, CA | 2,800 | 35 | — |
| LAND PROJECTS MUTUAL WATER CO. | LANCASTER, CA | 2,800 | 426 | — |
| SEASIDE MUNICIPAL WATER SYSTEM | SEASIDE, CA | 2,800 | 15 | — |
| RIO COSUMNES CORRECTIONAL CENTER [SWS] | SACRAMENTO, CA | 2,800 | 10 | — |
| CITY OF VALLEJO-LAKES SYSTEM | VALLEJO, CA | 2,800 | 6 | Clean |
| LAKE SHASTINA C.S.D | WEED, CA | 2,790 | 14 | — |
| O'CONNOR TRACT CO-OPERATIVE WATER CO. | PALO ALTO, CA | 2,789 | 12 | — |
| TOWN OF YOUNTVILLE | YOUNTVILLE, CA | 2,787 | 8 | Clean |
| ARBUCKLE PUBLIC UTILITY DISTRICT | ARBUCKLE, CA | 2,778 | 12 | — |