All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Foley Estates Winery Santa Barbara County |
366 | 0 | 0 | |
|
Golden State Water Morongo Delnorte San Bernardino County |
366 | 0 | 0 | |
|
Usfs Baker/deadman Cgd Tuolumne County |
366 | 1 | 0 | |
|
Volta Community SD Merced County |
366 | 2 | 1 | |
|
Nps Prns Five Brooks Marin County |
365 | 0 | 0 | |
|
Usfs/lassen Hat Creek Campgrnd Shasta County |
365 | 0 | 0 | |
|
Mount Diablo State Park Contra Costa County |
364 | 0 | 0 | |
|
Del Oro Water Co.-Magalia Butte County |
363 | 0 | 0 | |
|
Heights Mutual Water Company Sonoma County |
363 | 0 | 0 | |
|
Sisar Mutual Water CO Ventura County |
363 | 0 | 0 | |
|
South Coast Inn Santa Barbara County |
363 | 0 | 0 | |
|
Hidden Pines Campground Mendocino County |
362 | 0 | 0 | |
|
Havasu Water Company County |
361 | 11 | 4 | |
|
Monterey Mushrooms Santa Clara County |
361 | 1 | 1 | |
|
Yosemite RV Resort Madera County |
361 | 0 | 0 | |
|
Fowlers Campground-Stnf Siskiyou County |
360 | 0 | 0 | |
|
Grimmway Enterprises Cal Organic Therm Riverside County |
360 | 1 | 1 | |
|
Lake Morena Views Mwc San Diego County |
360 | 1 | 0 | |
|
Naf EL Centro Imperial County |
360 | 1 | 0 | |
|
Paradise Ranch MHP Los Angeles County |
360 | 0 | 0 | |
|
Pala South County |
360 | 1 | 1 | |
|
Yuima Municipal Water District San Diego County |
360 | 0 | 0 | |
|
EL Dorado ID Strawberry El Dorado County |
357 | 0 | 0 | |
|
Canada Woods WC Monterey County |
356 | 0 | 0 | |
|
Verde Vale Water Company Shasta County |
356 | 0 | 0 | |
|
Sutter Home Winery Inc. San Joaquin County |
355 | 0 | 0 | |
|
Wasuma School Madera County |
354 | 1 | 1 | |
|
Csp Angel Island ST Park Marin County |
353 | 0 | 0 | |
|
Fillmore Irrigation CO Ventura County |
353 | 0 | 0 | |
|
Peninsula Recreation Area El Dorado County |
353 | 0 | 0 | |
|
Cdpr-Hatfield Merced County |
352 | 0 | 0 | |
|
Fisherman's Retreat Riverside County |
352 | 1 | 1 | |
|
Aera Energy-Llc Kern County |
350 | 0 | 0 | |
|
Anderson Valley Elementary School Mendocino County |
350 | 0 | 0 | |
|
Bear Mountain RV Park Water System Kern County |
350 | 0 | 0 | |
|
Black Meadow Landing San Bernardino County |
350 | 0 | 0 | |
|
Butterfield Ranch San Diego County |
350 | 2 | 1 | |
|
Buttonwillow Raceway Park Circuit Kern County |
350 | 0 | 0 | |
|
Caltrans-Honey Lake Srra Lassen County |
350 | 0 | 0 | |
|
Caltrans-Massack Rest Stop Plumas County |
350 | 0 | 0 | |
|
Campos Bros. Farms Fresno County |
350 | 2 | 1 | |
|
Collins Lake Yuba County |
350 | 0 | 0 | |
|
Davenport County Sanitation Santa Cruz County |
350 | 0 | 0 | |
|
Fcsa 44d Monte Verdi Fresno County |
350 | 0 | 0 | |
|
George Chiala Farms, Inc.. Hollister · San Benito County |
350 | 0 | 0 | |
|
Green Acres Mobile Home Estate Fresno County |
350 | 1 | 1 | |
|
Green River Mutual Water Co. San Luis Obispo County |
350 | 1 | 1 | |
|
Hanford First Baptist Church Kings County |
350 | 0 | 0 | |
|
Hidden Springs Cg-State Parks Humboldt County |
350 | 0 | 0 | |
|
Knightsen Elementary School Contra Costa County |
350 | 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.