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 |
| LOS TULES MUTUAL WATER COMPANY | WARNER SPRINGS, CA | 238 | 33 | — |
| SHADED TERRACE PWS | STOCKTON, CA | 238 | 7 | — |
| TWIN OAKS MOBILE PARK | STOCKTON, CA | 238 | 22 | — |
| CASITAS MUTUAL WATER COMPANY | CASITAS SPRINGS, CA | 238 | 23 | — |
| SYCAMORE RANCH (EXEMPT) | MARYSVILLE, CA | 238 | 2 | — |
| MURRIETA PALMS MOBILE HOME PARK | HEMET, CA | 237 | 28 | — |
| PASKENTA COMM. SERVICES DIST. | PASKENTA, CA | 237 | 85 | — |
| CSP-HENDY WOODS STATE PARK | DUNCANS MILLS, CA | 236 | 4 | — |
| KING ISLAND TRAILER PARK WATER SYSTEM | STOCKTON, CA | 236 | 17 | — |
| FREEDOM RANCH | CAMPO, CA | 235 | 6 | — |
| FOLDED HILLS WINERY | GAVIOTA, CA | 235 | 2 | — |
| ROUNTREE FACILITY(PREV. SHERIFF'S REHAB) | SANTA CRUZ, CA | 235 | 21 | — |
| SONORA ESTATES MOBILE HOME PARK | YORBA LINDA, CA | 235 | 7 | — |
| ELKHORN ESTATES WATER SYSTEM | STOCKTON, CA | 234 | 5 | — |
| CASMALIA COMMUNITY SERVICES DISTRICT | CASMALIA, CA | 234 | 22 | — |
| NORTH OAKS MUTUAL WATER CO | OAKDALE, CA | 234 | 14 | — |
| RUTHERFORD HILL MUTUAL WATER | RUTHERFORD, CA | 232 | 10 | — |
| PINYON PINES COUNTY WATER DIST | MOUNTAIN CENTER, CA | 232 | 17 | — |
| DOGWOOD BLUE JAY CYN IMP | BLUE JAY, CA | 232 | 3 | — |
| HOLIDAY HARBOR INC | OBRIEN, CA | 232 | 6 | — |
| NPS-HOSPITAL ROCK | THREE RIVERS, CA | 232 | 2 | — |
| SYLVAN HARBOR TRAILER PARK | TRINIDAD, CA | 231 | 12 | — |
| FOSSIL DISCOVERY CENTER | CHOWCHILLA, CA | 231 | 3 | — |
| YMCA CAMP ARBOLADO | ANGELUS OAKS, CA | 231 | 40 | — |
| ACAMPO WATER SYSTEM | STOCKTON, CA | 231 | 1 | — |
| SALYER MUTUAL WC (FORMERLY RIVERVIEW AC) | SALYER, CA | 231 | 66 | — |
| FIRST MACE MEADOWS UNIT NO. 2 | PINE GROVE, CA | 230 | 3 | — |
| NORD COUNTRY SCHOOL | CHICO, CA | 230 | 15 | — |
| RIVERVIEW WATER ASSOCIATION | BETHEL ISLAND, CA | 230 | 15 | — |
| CAPAY JOINT UNION ELEM. SCHOOL | ORLAND, CA | 230 | 15 | — |
| FAMOSO FUEL STOP | BAKERSFIELD, CA | 230 | 22 | — |
| JOHNSTONVILLE ELEMENTARY SCHOOL | JOHNSTONVILLE, CA | 230 | 8 | — |
| MADERA CO SA02-WISHON COVE | MADERA, CA | 230 | 29 | — |
| MILLER'S LANDING RESORT | WISHON, CA | 230 | 52 | — |
| HENDERSON COUNTY PARK | MERCED, CA | 230 | 18 | — |
| CROWLEY LAKE TRAILER PARK | CROWLEY LAKE, CA | 230 | 38 | — |
| SPANISH FLAT WATER DISTRICT | NAPA, CA | 230 | 21 | — |
| CSA NO. 31 STONEGATE WS | HOLLISTER, CA | 230 | 30 | — |
| PINEWOOD COVE RESORT | OAKLAND, CA | 230 | 0 | — |
| FOOTHILL HORIZONS | SONORA, CA | 230 | 24 | — |
| SAN JOSE FAMILY CAMP | SAN JOSE, CA | 230 | 12 | — |
| LUCERNE VALLEY MWC | LUCERNE VALLEY, CA | 228 | 6 | — |
| CINNABAR ELEMENTARY SCHOOL | PETALUMA, CA | 228 | 14 | — |
| PIONEER ELEMENTARY SCHOOL | SOMERSET, CA | 227 | 51 | — |
| TERRY SCHOOL | SELMA, CA | 226 | 16 | — |
| SIERRA PINES CAMP | ROSEVILLE, CA | 226 | 69 | — |
| CWS-SPLIT MOUNTAIN WATER SYSTEM | SAN JOSE, CA | 226 | 18 | — |
| UNDER CANVAS-YOSEMITE | GOVELAND, CA | 226 | 0 | — |
| EL TORERO RESTAURANT | LOCKEFORD, CA | 225 | 19 | — |
| I-5 AND HWY 198 REST AREA | AVENAL, CA | 225 | 195 | — |