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 |
| ALMOND GROVE MOBILE PARK | CHICO, CA | 253 | 20 | — |
| NID SCOTTS FLAT LAKE RESERVOIR | GRASS VALLEY, CA | 253 | 48 | — |
| BRANCH ELEMENTARY SCHOOL | ARROYO GRANDE, CA | 253 | 3 | — |
| HOUGHTON-KEARNEY SCHOOL | FRESNO, CA | 252 | 34 | — |
| CLEAR WATER MUTUAL WATER COMPANY | KELSEYVILLE, CA | 252 | 46 | — |
| SUSAN HILLS ESTATES WC | SUSANVILLE, CA | 252 | 8 | — |
| 132 INVESTMENTS WATER SYSTEM | TRACY, CA | 252 | 18 | — |
| SONOMA COUNTY PARKS-VET. MEMORIAL BEACH | SANTA ROSA, CA | 252 | 4 | — |
| RUTH LAKE RECREATION AREA | MAD RIVER, CA | 252 | 6 | — |
| PARDEE RECREATION AREA | VALLEY SPRINGS, CA | 251 | 3 | — |
| ROYAL OAKS PARK WS | SALINAS, CA | 251 | 38 | — |
| LASSEN VNP - SUMMIT LAKE | MINERAL, CA | 251 | 2 | — |
| CAMP RITCHIE | LANCASTER, CA | 250 | 8 | — |
| CAMP WOLFEBORO | PLEASANT HILL, CA | 250 | 36 | — |
| COLUSA CO. SERVICE AREA #2-STONYFORD | CITY OF COLUSA, CA | 250 | 15 | — |
| NORTHCREST TRAILER CITY | STOCKTON, CA | 250 | 27 | — |
| AMERICAN UNION SCHOOL | FRESNO, CA | 250 | 76 | — |
| WENCH CREEK CAMPGROUND | HOLLISTER, CA | 250 | 18 | — |
| CAMP SACRAMENTO | SACRAMENTO, CA | 250 | 28 | — |
| CAMP SIERRA | KINGSBURG, CA | 250 | 69 | — |
| WISHON VILLAGE | SHAVER LAKE, CA | 250 | 15 | — |
| FRESNO VALVES & CASTINGS | SELMA, CA | 250 | 11 | — |
| DOLLAR GENERAL 19853 - SQUAW VALLEY | LENEXA, CA | 250 | 0 | — |
| DOLLAR GENERAL STORE #15320 | GOODLETTSVILLE, CA | 250 | 4 | — |
| PLAZA ELEMENTARY SCHOOL | ORLAND, CA | 250 | 3 | — |
| GREEN DIAMOND RESOURCE COMPANY - KORBEL | KORBEL, CA | 250 | 5 | — |
| ASTORGAS WATER SYSTEM | BISHOP, CA | 250 | 29 | — |
| POND SCHOOL WATER SYSTEM | WASCO, CA | 250 | 71 | — |
| V LIONS OPS WATER SYSTEM | WASCO, CA | 250 | 36 | — |
| COUNTRYSIDE MKT & RESTRN-119 | BAKERSFIELD, CA | 250 | 9 | — |
| WONDERFUL NURSERIES, LLC | SHAFTER, CA | 250 | 14 | — |
| SOLEDAD MOUNTAIN PROJECT WATER SYSTEM | MOJAVE, CA | 250 | 14 | — |
| SHAFFER ELEMENTARY SCHOOL | LITCHFIELD, CA | 250 | 5 | — |
| DOLLAR GENERAL JANESVILLE | GOODLETTSVILLE, CA | 250 | 0 | — |
| BASS LAKE HEIGHTS MUTUAL WATER | OAKHURST, CA | 250 | 117 | — |
| EAST ACRES MUTUAL WATER COMPANY | FIREBAUGH, CA | 250 | 90 | — |
| SIERRA VIEW SCHOOL | MADERA, CA | 250 | 35 | — |
| JACKASS ROCK CAMP | CLOVIS, CA | 250 | 12 | — |
| SKYWALKER RANCH | NICASIO, CA | 250 | 9 | — |
| MCPR-CATHEY S VALLEY PARK | MARIPOSA, CA | 250 | 12 | — |
| RIVER ESTATES MUTUAL WATER COMPANY | UKIAH, CA | 250 | 6 | — |
| OCEAN'S EDGE ESTATES | FORT BRAGG, CA | 250 | 10 | — |
| FIREBAUGH TRAVEL PLAZA (SW) | CONCORD, CA | 250 | 24 | — |
| ALTMAN PLANTS WS #04 -ESP 420 (PREV CS1) | SALINAS, CA | 250 | 76 | — |
| WASHINGTON SCHOOL WS | SALINAS, CA | 250 | 310 | — |
| MEYERS WATER CO. | NAPA, CA | 250 | 38 | — |
| HESS WINERY | NAPA, CA | 250 | 15 | — |
| PLEASANT RIDGE SCHOOL | GRASS VALLEY, CA | 250 | 28 | — |
| HEATHER GLEN COMMUNITY SERVICE DIST | APPLEGATE, CA | 250 | 32 | — |
| ALPINE MEADOWS PROPERTY OWNERS ASSO | COLFAX, CA | 250 | 32 | — |