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 |
| GRIDLEY FARM LABOR HOUSING | CHICO, CA | 460 | 15 | — |
| DIAMOND JIM S CASINO | ROSAMOND, CA | 460 | 14 | — |
| PENCE VINEYARDS | BUELLTON, CA | 460 | 1 | — |
| RINCON VALLEY MOBILE ESTATES | NOVATO, CA | 460 | 14 | — |
| WILLOWSIDE SCHOOL | SANTA ROSA, CA | 460 | 6 | — |
| CLARKSBURG MIDDLE SCHOOL | RIO VISTA, CA | 460 | 24 | — |
| TRAILER HAVEN MOBILE HOME PARK | SACRAMENTO, CA | 459 | 4 | — |
| POINT ARENA WATER WORKS | POINT ARENA, CA | 459 | 5 | — |
| KENNEDY GROCERY | LA QUINTA, CA | 458 | 77 | — |
| CENTERVILLE SCHOOL | SANGER, CA | 456 | 24 | — |
| BUENA VISTA MIGRANT CENTER | MODESTO, CA | 455 | 18 | — |
| CLOVERDALE MUTUAL WATER CO. | OXNARD, CA | 455 | 8 | — |
| PRIMEX FARMS WATER SYSTEM | WASCO, CA | 454 | 9 | — |
| WIND WOLVES PRESERVE | BAKERSFIELD, CA | 452 | 26 | — |
| DELHI KINGDOM HALL | WINTON, CA | 452 | 11 | — |
| BUTTONWILLOW RACEWAY PARK CLASSIC | BUTTONWILLOW, CA | 451 | 9 | — |
| USDA-FOREST SERVICE PRINCESS CAMPGROUND | OVERLAND PARK, CA | 450 | 1 | — |
| TRINITY PRESBYTERIAN CHURCH | CLOVIS, CA | 450 | 16 | — |
| LASSEN COUNTY WATER DISTRICT #1 | BIEBER, CA | 450 | 2 | — |
| SHADOW ACRES MUTUAL WATER COMPANY | PALMDALE, CA | 450 | 4 | — |
| GOLDEN SANDS MOBILE HOME PARK | ROSEMEAD, CA | 450 | 10 | — |
| ILEAD AGUA DULCE CHARTER SCHOOL | ACTON, CA | 450 | 14 | — |
| GENERAL ATOMICS AERONAUTICAL - GRAY BUTT | PALMDALE, CA | 450 | 3 | — |
| MADERA MH & RV PARK | MADERA, CA | 450 | 161 | — |
| CBUSO MISSION BELL | MADERA, CA | 450 | 74 | — |
| SKP PARK OF THE SIERRAS INC | COARSEGOLD, CA | 450 | 15 | — |
| MINARETS HIGH SCHOOL | ONEALS, CA | 450 | 7 | — |
| YOSEMITE NPS-BRIDALVEIL CREEK CG | YOSEMITE NP, CA | 450 | 0 | — |
| MOTHER TRUCKERS WATER SYSTEM | GRASS VALLEY, CA | 450 | 0 | — |
| NYACK WATER SYSTEM | EMIGRANT GAP, CA | 450 | 15 | — |
| LIGHTHOUSE MARINA RESTAURANT & RESORT | ISLETON, CA | 450 | 11 | — |
| OLYMPIA MOBILODGE | FAIR OAKS, CA | 450 | 3 | Detected |
| GLEN MARTIN MWC | ANGELUS OAKS, CA | 450 | 8 | — |
| COUNTY SERVICE AREA 11 | REDWOOD CITY, CA | 450 | 47 | — |
| CAMP SARATOGA | SARATOGA, CA | 450 | 5 | — |
| CINNABAR HILLS GOLF CLUB | SAN JOSE, CA | 450 | 10 | — |
| PACHECO ELEMENTARY SCHOOL | REDDING, CA | 450 | 6 | — |
| CERES UNIFIED/WESTPORT SCHOOL | CERES, CA | 450 | 30 | — |
| SIERRA PACIFIC INDUSTRIES - RED BLUFF MI | RED BLUFF, CA | 450 | 1 | — |
| CLARK SYSTEM | REDDING, CA | 450 | 6 | — |
| CLARK PACIFIC - CR 18C | WOODLAND, CA | 450 | 26 | — |
| PRATHER WATER DISTRICT | CLOVIS, CA | 449 | 48 | — |
| LAKE COUNTY CSA 13 - KONO TAYEE | LAKEPORT, CA | 449 | 4 | — |
| WEOTT C.S.D. | PHILLIPSVILLE, CA | 448 | 70 | — |
| WARNER SPRINGS ESTATES | TEMECULA, CA | 448 | 162 | — |
| WILLOWSIDE MUTUAL WATER COMPANY | SANTA ROSA, CA | 448 | 16 | — |
| ANTELOPE PARK MUTUAL WATER COMPANY | LANCASTER, CA | 445 | 6 | — |
| LAGUNA DEL SOL INC | WILTON, CA | 445 | 1 | — |
| MI WUK HEIGHTS MWC | MI WUK VILLAGE, CA | 445 | 15 | — |
| CASINI RANCH CAMPGROUND | DUNCAN MILLS, CA | 442 | 9 | — |