All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Stonegate Mobile Home Park Sonoma County |
196 | 0 | 0 | |
|
Western Mwd (id a Rainbow) Riverside County |
196 | 0 | 0 | |
|
Allen Road Mutual Water System Kern County |
195 | 0 | 0 | |
|
Alpine Acres Mutual Water CO Tuolumne County |
195 | 3 | 0 | |
|
Silver Dollar Fairgrounds Butte County |
195 | 1 | 1 | |
|
Tid/ la Grange Water System Stanislaus County |
195 | 0 | 0 | |
|
Mpwd-Coulterville Csa 1 Mariposa County |
193 | 0 | 0 | |
|
Roaring Camp Railroad INC Santa Cruz County |
193 | 0 | 0 | |
|
Accelerated Charter High School Tulare County |
192 | 2 | 2 | |
|
Auberry Lds Church Fresno County |
192 | 0 | 0 | |
|
Las Flores Water Works Tehama County |
191 | 1 | 1 | |
|
Alderpoint County Water Humboldt County |
190 | 1 | 1 | |
|
Bridge Camp Trinity County |
190 | 0 | 0 | |
|
Camp Jack Hazard Tuolumne County |
190 | 0 | 0 | |
|
Placer Cwa Applegate Placer County |
190 | 0 | 0 | |
|
Revol Greens Kern County |
190 | 0 | 0 | |
|
Rio Mesa Golf INC Madera County |
190 | 0 | 0 | |
|
Santa Cruz Waldorf School Santa Cruz County |
190 | 0 | 0 | |
|
Shepherd of the Hills Tehachapi Kern County |
190 | 0 | 0 | |
|
Susanville Upper Rancheria Susanville Upper Rancheria · County |
190 | 2 | 0 | |
|
Timber Cove County Water District Sonoma County |
190 | 2 | 0 | |
|
Awa la Mel Heights #3 Amador County |
188 | 0 | 0 | |
|
Carmet by the Sea Water Company Sonoma County |
188 | 0 | 0 | |
|
Caspar South Service Company Mendocino County |
188 | 0 | 0 | |
|
Monte Vista Farming Denair · Stanislaus County |
188 | 3 | 2 | |
|
Park West Mutual Water Company Inyo County |
188 | 0 | 0 | |
|
Shamrock Mobile Home Park Sonoma County |
188 | 1 | 0 | |
|
132 Investments Water System San Joaquin County |
187 | 1 | 0 | |
|
Fern Grove Water Club Santa Cruz County |
187 | 1 | 1 | |
|
Ken's Shopping Center Fresno County |
187 | 1 | 0 | |
|
U.s.n., San Nicolas Island Ventura County |
187 | 0 | 0 | |
|
Carnegie Svra San Joaquin County |
186 | 0 | 0 | |
|
Ellwood Mutual Water Company Santa Barbara County |
186 | 2 | 2 | |
|
Lakeside Woods Mutual Water CO Shasta County |
186 | 1 | 1 | |
|
Monterey Park Tract Csd Stanislaus County |
186 | 1 | 1 | |
|
Round Valley High School Mendocino County |
186 | 0 | 0 | |
|
Alpine Oaks Estates LLC San Diego County |
185 | 0 | 0 | |
|
Bethel Island MHC Contra Costa County |
185 | 0 | 0 | |
|
Countryside Mobile Home Park Yuba County |
185 | 0 | 0 | |
|
Csp Bale Grist Mill State Historic Par Napa County |
185 | 0 | 0 | |
|
Del Oro WC Arbuckle District Colusa County |
185 | 0 | 0 | |
|
Doyle Springs Association Tulare County |
185 | 0 | 0 | |
|
Hrc C.s.d. Del Norte County |
185 | 1 | 1 | |
|
Kellogg Garden Products San Joaquin County |
185 | 0 | 0 | |
|
Marcum Illinois Elementary School Sutter County |
185 | 1 | 1 | |
|
Morongo Golf Course at Tukwet Cnyn Riverside County |
185 | 0 | 0 | |
|
Pauma Valley Water Company San Diego County |
185 | 5 | 2 | |
|
Rolling Hills Rancho WA Monterey County |
185 | 1 | 1 | |
|
Sonoma Mountain County Water District Sonoma County |
185 | 0 | 0 | |
|
Usfs-Buckhorn Camp A-12 Water Los Angeles County |
185 | 0 | 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.