All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Loma Prieta Jusd-Loma Prieta School Santa Clara County |
542 | 0 | 0 | |
|
Lanare Community Services Dist Fresno County |
540 | 0 | 0 | |
|
Riverview Mobile Home Estates Stanislaus County |
540 | 2 | 0 | |
|
Sherwood Mobile Home Park Los Angeles County |
540 | 0 | 0 | |
|
Whitehawk Ranch Mwc Plumas County |
540 | 1 | 0 | |
|
Armstrong Valley-Cal Water Service (puc) Sonoma County |
539 | 0 | 0 | |
|
LE Trianon Resort Lake County |
539 | 0 | 0 | |
|
Woodland Park Mutual Water CO San Luis Obispo County |
538 | 2 | 0 | |
|
Woodward Reservoir Water System Stanislaus County |
537 | 0 | 0 | |
|
Riverview School Fresno County |
536 | 0 | 0 | |
|
Gabilan WC Monterey County |
535 | 0 | 0 | |
|
Lone Pine Lone Pine Reservation · County |
535 | 1 | 0 | |
|
Sid Gibson Canyon Solano County |
535 | 2 | 2 | |
|
Wsl Surf Ranch Kings County |
535 | 0 | 0 | |
|
Colusa Industrial Properties Colusa County |
533 | 0 | 0 | |
|
Csa 42 Oro Grande San Bernardino County |
533 | 0 | 0 | |
|
Allensworth Csd Tulare County |
531 | 1 | 0 | |
|
Menf-Fouts Springs CG Colusa County |
531 | 0 | 0 | |
|
Palms River Resort San Bernardino County |
531 | 1 | 1 | |
|
United Pacific #0251 Madera County |
530 | 0 | 0 | |
|
Windmill Resort San Bernardino County |
530 | 0 | 0 | |
|
Deloro Valley Water System Tuolumne County |
528 | 2 | 0 | |
|
Willowside Mutual Water Company Sonoma County |
528 | 0 | 0 | |
|
Cazadero Water Company, Inc. (puc) Sonoma County |
525 | 3 | 2 | |
|
Mountain Meadows Mwc Mono County |
525 | 0 | 0 | |
|
Castlewood Domestic Water System Alameda County |
524 | 1 | 0 | |
|
North Tahoe Pud Carnelian Woods Placer County |
524 | 0 | 0 | |
|
Santa Lucia Preserve WS Monterey County |
524 | 1 | 0 | |
|
Heavenly Ski Gondola El Dorado County |
520 | 1 | 0 | |
|
Heavenly Ski Sky Deck El Dorado County |
520 | 0 | 0 | |
|
Psmcsd Moss Landing Harbor WS Monterey County |
520 | 0 | 0 | |
|
Usfs Paradise Cove Campground Kern County |
520 | 0 | 0 | |
|
Rancho Alegre Santa Barbara County |
519 | 0 | 0 | |
|
West Palm Springs Village Riverside County |
517 | 0 | 0 | |
|
Frazier Mountain High School Kern County |
516 | 0 | 0 | |
|
Circle V Ranch Camp Santa Barbara County |
515 | 0 | 0 | |
|
Cahuilla Casino County |
515 | 1 | 0 | |
|
Rio del Colorado San Bernardino County |
515 | 0 | 0 | |
|
Big Rock C.s.d. Del Norte County |
513 | 0 | 0 | |
|
Colusa Co. Wwd #1 Grimes Colusa County |
512 | 2 | 1 | |
|
Del Oro Water Co.-Stirling Bluffs Butte County |
512 | 0 | 0 | |
|
Indian Creek Golf Course Placer County |
512 | 0 | 0 | |
|
Madera District Fair Madera County |
512 | 0 | 0 | |
|
Uvas Canyon County Park Santa Clara County |
512 | 0 | 0 | |
|
Indianola School Fresno County |
511 | 1 | 0 | |
|
Burger King #9310 San Bernardino County |
510 | 1 | 0 | |
|
Gilroy Usd-Rucker School Santa Clara County |
510 | 0 | 0 | |
|
Rockwell Collins Inc. (fka Upco-Utas) Solano County |
510 | 1 | 1 | |
|
Santa Ysabel Enterprise System County |
510 | 1 | 0 | |
|
Jenness Park Christian Camp Tuolumne County |
508 | 1 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules currently in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.