All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Home Garden Csd Kings County |
1,750 | 1 | 1 | |
|
Penngrove Water Company (puc) Sonoma County |
1,742 | 0 | 0 | |
|
Woodville Public Utility Dist Tulare County |
1,740 | 1 | 0 | |
|
LE Grand Comm Services Dist Merced County |
1,739 | 2 | 1 | |
|
Seeley Cwd Imperial County |
1,729 | 1 | 1 | |
|
Willow Creek C.s.d. Humboldt County |
1,720 | 1 | 1 | |
|
Golden State Water CO Morongo del Sur San Bernardino County |
1,715 | 0 | 0 | |
|
Cal American WC Rio Plaza Ventura County |
1,712 | 0 | 0 | |
|
Dunsmuir, City of Dunsmuir · Siskiyou County |
1,707 | 2 | 1 | |
|
Branch Center [sws] Sacramento County |
1,700 | 1 | 1 | |
|
Lake Don Pedro Csd Tuolumne County |
1,700 | 3 | 1 | |
|
Naval Base Ventura County, Point Mugu Ventura County |
1,700 | 1 | 0 | |
|
Cal AM Isleton Sacramento County |
1,693 | 0 | 0 | |
|
Pcwa Weimar Placer County |
1,689 | 0 | 0 | |
|
Del Oro Water Co-Ferndale Humboldt County |
1,662 | 0 | 0 | |
|
Westwood C.s.d. Lassen County |
1,662 | 0 | 0 | |
|
Oakwood Lake Water District-Subdivision San Joaquin County |
1,640 | 0 | 0 | |
|
Madera CO Cmd19-Parkwood Madera County |
1,637 | 1 | 0 | |
|
Avila Beach Community Services District San Luis Obispo County |
1,630 | 0 | 0 | |
|
Brannan Island State Rec. Area Sacramento County |
1,622 | 0 | 0 | |
|
Richgrove Community Services District Tulare County |
1,617 | 8 | 3 | |
|
Liberty Utilities Mesa Crest Los Angeles County |
1,616 | 0 | 0 | |
|
Callayomi County Water District Lake County |
1,607 | 1 | 1 | |
|
Los Alamitos Race Course Orange County |
1,600 | 1 | 1 | |
|
San Miguelito Mwc San Luis Obispo County |
1,600 | 1 | 0 | |
|
Smwd-Nichols Institute Orange County |
1,600 | 0 | 0 | |
|
Tiger Water Supply San Luis Obispo County |
1,600 | 0 | 0 | |
|
Whiskeytown Nra-Brandy Creek Shasta County |
1,582 | 0 | 0 | |
|
Durham Irrigation District Butte County |
1,581 | 1 | 0 | |
|
Cal-Water Service Co.-Hamilton City Hamilton City · Glenn County |
1,575 | 0 | 0 | |
|
Devore WC San Bernardino County |
1,574 | 0 | 0 | |
|
Oid-Oakdale Rural Water System #1 Stanislaus County |
1,570 | 0 | 0 | |
|
Lynwood Park Mutual Water Co. Los Angeles County |
1,564 | 1 | 1 | |
|
Madera CO Sa1-Indian Lakes Madera County |
1,562 | 0 | 0 | |
|
Dole Atwater Plant Merced County |
1,550 | 0 | 0 | |
|
Pine Cove Water District Riverside County |
1,540 | 0 | 0 | |
|
Fall River Valley Csd Shasta County |
1,535 | 0 | 0 | |
|
Los Alamos Community Services District Santa Barbara County |
1,534 | 0 | 0 | |
|
Lake County Csa 2 Spring Valley Lake County |
1,531 | 0 | 0 | |
|
Bear River/singley Hill County |
1,530 | 4 | 0 | |
|
Palm Springs Aerial Tramway Riverside County |
1,530 | 0 | 0 | |
|
Cal AM Water Company Hidden Hills Monterey County |
1,521 | 0 | 0 | |
|
Hume Lake Christian Camps, INC Fresno County |
1,519 | 1 | 0 | |
|
White Fence Farms Mwc No. 1 Los Angeles County |
1,518 | 0 | 0 | |
|
Pearsonville Water System Inyo County |
1,515 | 0 | 0 | |
|
Richardson Grove Sp-State Parks Humboldt County |
1,507 | 0 | 0 | |
|
Wp&a Lost Hills Water System Kern County |
1,506 | 0 | 0 | |
|
Nps Prns Beaches Marin County |
1,505 | 0 | 0 | |
|
Buckingham Park Water District Lake County |
1,502 | 0 | 0 | |
|
Mariana Ranchos Cwd San Bernardino County |
1,502 | 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.