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 |
| CHINA LAKE ACRES MUTUAL WATER COMPANY | INYOKERN, CA | 198 | 12 | — |
| WESTERN SKIES MOBILE HOME PARK | LANCASTER, CA | 198 | 7 | — |
| STERLING MUTUAL WATER COMPANY | EL MONTE, CA | 198 | 17 | — |
| COLONIAL OAK WC INC | SALINAS, CA | 198 | 66 | — |
| ALPINE VILLAGE | ROMOLAND, CA | 198 | 75 | — |
| CRAZZY'S WASEWAGAN CAMP | ANGELUS OAKS, CA | 198 | 26 | — |
| FCWWD 40 - SHAVER SPRINGS | FRESNO, CA | 196 | 89 | — |
| LONG VALLEY CHARTER SCHOOL | DOYLE, CA | 196 | 2 | — |
| USFWS SAN LUIS NWR COMPLEX | LOS BANOS, CA | 196 | 0 | — |
| STONEGATE MOBILE HOME PARK | LOS ANGELES, CA | 196 | 12 | — |
| REEDS CREEK SCHOOL | RED BLUFF, CA | 196 | 3 | — |
| SATICOY COUNTRY CLUB-CITY OF VENTURA | VENTURA, CA | 196 | 0 | — |
| SILVER DOLLAR FAIRGROUNDS | CHICO, CA | 195 | 14 | — |
| ALLEN ROAD MUTUAL WATER SYSTEM | BAKERSFIELD, CA | 195 | 25 | — |
| HITCHIN LUCERNE INC | LUCERNE VALLEY, CA | 195 | 4 | — |
| TID/ LA GRANGE WATER SYSTEM | TURLOCK, CA | 195 | 34 | — |
| ALPINE ACRES MUTUAL WATER CO | SOULSBYVILLE, CA | 195 | 18 | — |
| MPWD-COULTERVILLE CSA 1 | MARIPOSA, CA | 193 | 23 | — |
| VENTANA BIG SUR INN WS | BIG SUR, CA | 193 | 19 | — |
| PALOMAR MOUNTAIN MUTUAL WATER CO. | BONITA, CA | 193 | 33 | — |
| ROARING CAMP RAILROAD INC | FELTON, CA | 193 | 35 | — |
| AUBERRY LDS CHURCH | TULARE, CA | 192 | 4 | — |
| WESTERN MWD (ID A - RAINBOW) | RIVERSIDE, CA | 192 | 0 | — |
| PESCADERO HIGH SCHOOL | PESCADERO, CA | 192 | 14 | — |
| ACCELERATED CHARTER HIGH SCHOOL | TULARE, CA | 192 | 19 | — |
| LAS FLORES WATER WORKS | GERBER, CA | 191 | 25 | — |
| U.C. KEARNEY FIELD STATION | PARLIER, CA | 190 | 19 | — |
| FRESNO CLOVIS RWRF WATER SYSTEM | FRESNO, CA | 190 | 4 | — |
| SHEPHERD OF THE HILLS - TEHACHAPI | TEHACHAPI, CA | 190 | 0 | — |
| REVOL GREENS | TEHACHAPI, CA | 190 | 0 | — |
| RIO MESA GOLF INC | FRESNO, CA | 190 | 9 | — |
| PLACER CWA - APPLEGATE | AUBURN, CA | 190 | 0 | — |
| SANTA CRUZ WALDORF SCHOOL | SANTA CRUZ, CA | 190 | 18 | — |
| BRIDGE CAMP | REDDING, CA | 190 | 2 | — |
| CAMP JACK HAZARD | MODESTO, CA | 190 | 34 | — |
| AWA LA MEL HEIGHTS #3 | SUTTER CREEK, CA | 188 | 13 | — |
| PARK WEST MUTUAL WATER COMPANY | BISHOP, CA | 188 | 2 | — |
| CASPAR SOUTH SERVICE COMPANY | SANTA ROSA, CA | 188 | 13 | — |
| SILVER OAK WINE CELLARS | HEALDSBURG, CA | 188 | 10 | — |
| SHAMROCK MOBILE HOME PARK | SANTA ROSA, CA | 188 | 64 | — |
| MONTE VISTA FARMING | DENAIR, CA | 188 | 9 | — |
| KEN'S SHOPPING CENTER | AUBERRY, CA | 187 | 3 | — |
| FERN GROVE WATER CLUB | SCOTTS VALLEY, CA | 187 | 20 | — |
| WOODRIDGE MUTUAL WATER CO | SHINGLETOWN, CA | 187 | 10 | — |
| ROUND VALLEY HIGH SCHOOL | COVELO, CA | 186 | 35 | — |
| CRYSTAL LAKE PROPERTY OWNERS | YERMO, CA | 186 | 4 | — |
| CSP CASWELL STATE PARK | COLUMBIA, CA | 186 | 7 | — |
| ELLWOOD MUTUAL WATER COMPANY | SANTA BARBARA, CA | 186 | 11 | — |
| CAMPBELL SOUP DIXON | DIXON, CA | 186 | 3 | — |
| MONTEREY PARK TRACT CSD | CERES, CA | 186 | 124 | — |