All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Eastside Water Association Orange County |
2,000 | 1 | 0 | |
|
EL Camino Hospital Santa Clara County |
2,000 | 0 | 0 | |
|
Gregori High School Stanislaus County |
2,000 | 0 | 0 | |
|
Lee's Frontier Inyo County |
2,000 | 0 | 0 | |
|
Mariposa Public Utility Dist Mariposa County |
2,000 | 0 | 0 | |
|
Marysville Raceway Park Yuba County |
2,000 | 1 | 0 | |
|
Mobiland Camper Park San Diego County |
2,000 | 1 | 0 | |
|
Northstar Summit Deck & Grill Placer County |
2,000 | 0 | 0 | |
|
Pyramid Creek Trailhead El Dorado County |
2,000 | 0 | 0 | |
|
U.s. Army Corps-Lake Mendo (bushay Site) Mendocino County |
2,000 | 0 | 0 | |
|
Usfs-Crystal Lake B-13 Water Los Angeles County |
2,000 | 0 | 0 | |
|
Western Hills Water District/diablo Gran Stanislaus County |
2,000 | 0 | 0 | |
|
Golden State Water Company Tanglewood Santa Barbara County |
1,979 | 0 | 0 | |
|
Ventura Cwwd No. 17 Bell Canyon Ventura County |
1,946 | 0 | 0 | |
|
Bolinas Community Pud Marin County |
1,937 | 0 | 0 | |
|
Lost Hills Utility District Kern County |
1,926 | 1 | 0 | |
|
Bolthouse Fresh Foods Kern County |
1,917 | 0 | 0 | |
|
Cabazon Water District Riverside County |
1,900 | 2 | 0 | |
|
Sierra Tahoe Main Lodge El Dorado County |
1,900 | 5 | 0 | |
|
Sierra Tahoe West Bowl El Dorado County |
1,900 | 2 | 0 | |
|
Hamilton Branch Csd Plumas County |
1,874 | 1 | 0 | |
|
U.s. Army Corp New Hogan Calaveras County |
1,860 | 0 | 0 | |
|
Lake Siskiyou Campground Siskiyou County |
1,850 | 0 | 0 | |
|
Mecca Arco Travel Center Riverside County |
1,847 | 1 | 1 | |
|
Fieldbrook Glendale C.s.d. Humboldt County |
1,845 | 1 | 1 | |
|
North Marin WD Pt. Reyes Marin County |
1,841 | 0 | 0 | |
|
San Joaquin County Colonial Heights San Joaquin County |
1,841 | 0 | 0 | |
|
Inyo County Pwd Lone Pine Inyo County |
1,835 | 4 | 1 | |
|
Vineyard Avenue Acres Mwc Ventura County |
1,820 | 2 | 2 | |
|
Searles Valley Minerals Operations INC San Bernardino County |
1,818 | 0 | 0 | |
|
Andrew Murray Vineyard Santa Barbara County |
1,815 | 0 | 0 | |
|
Pinnacles National Park-East District San Benito County |
1,811 | 1 | 1 | |
|
Kinneloa Irrigation Dist. Los Angeles County |
1,808 | 1 | 0 | |
|
Ladera Golf Club Riverside County |
1,806 | 0 | 0 | |
|
Chp Mission Grade Scales Pleasanton · Alameda County |
1,800 | 1 | 0 | |
|
Christian Valley Park Csd Placer County |
1,800 | 0 | 0 | |
|
Dp&r McArthur-Burney Falls SP Shasta County |
1,800 | 0 | 0 | |
|
London Community Serv Dist Tulare County |
1,800 | 0 | 0 | |
|
Slavic Missionary Church INC Sacramento County |
1,800 | 0 | 0 | |
|
Tud Tuolumne Water System Sonora · Tuolumne County |
1,798 | 1 | 0 | |
|
Lake Elizabeth Mutual Water Co. Los Angeles County |
1,790 | 0 | 0 | |
|
San Mateo County Memorial Park San Mateo County |
1,790 | 0 | 0 | |
|
Madera CO Sa3-Parksdale Madera County |
1,789 | 0 | 0 | |
|
Linden County Water District San Joaquin County |
1,784 | 0 | 0 | |
|
Tud Ponderosa Tuolumne County |
1,781 | 1 | 0 | |
|
Leavitt Campground Mono County |
1,778 | 0 | 0 | |
|
Cold Springs Water CO Tuolumne County |
1,771 | 1 | 0 | |
|
Majestic Pines Community SD San Diego County |
1,768 | 1 | 1 | |
|
Ventura Cwwd No. 38 Lake Sherwood Ventura County |
1,759 | 0 | 0 | |
|
Caltrans Camp Roberts Rsra NB Monterey County |
1,750 | 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.