All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Little Bear Water Company Monterey County |
2,327 | 1 | 1 | |
|
Trinity Co. W.w. Dist #1 Trinity County |
2,324 | 1 | 0 | |
|
Clawa San Bernardino County |
2,320 | 0 | 0 | |
|
Lucerne Water Co. Cal Water Service Lake County |
2,312 | 0 | 0 | |
|
Eisenhower Medical Center(water) Riverside County |
2,300 | 0 | 0 | |
|
Kirkwood Meadows Public Utility District Alpine County |
2,297 | 1 | 1 | |
|
Mountain Gate C.s.d. Shasta County |
2,227 | 1 | 1 | |
|
Selma High School Fresno County |
2,225 | 2 | 1 | |
|
Las Flores Water Co. Los Angeles County |
2,211 | 0 | 0 | |
|
Santa Nella County Water District Merced County |
2,211 | 0 | 0 | |
|
Bullard's Bar Rec Fac Wtr Sys Yuba County |
2,208 | 0 | 0 | |
|
Jedediah Smith State Park Del Norte County |
2,208 | 0 | 0 | |
|
Tejon Ranch Grapevine Water Kern County |
2,207 | 0 | 0 | |
|
Lone Pine Campground Inyo County |
2,205 | 0 | 0 | |
|
Westmorland, City of Westmorland · Imperial County |
2,202 | 3 | 1 | |
|
Cal Trans C.v. Kane San Bernardino County |
2,200 | 1 | 0 | |
|
Chemehuevi Water County |
2,200 | 4 | 0 | |
|
Dry Creek Rancheria County |
2,200 | 1 | 0 | |
|
Mil Potrero Mwc Kern County |
2,200 | 0 | 0 | |
|
Poplar Comm Service Dist Tulare County |
2,200 | 0 | 0 | |
|
Diamond Valley Market Water Riverside County |
2,195 | 1 | 0 | |
|
Nacimiento Water Company San Luis Obispo County |
2,191 | 3 | 2 | |
|
Chester Public U.d. Plumas County |
2,187 | 0 | 0 | |
|
Cdcr California Health Care Facility Stockton · San Joaquin County |
2,186 | 0 | 0 | |
|
Morro Rock Mutual Water CO San Luis Obispo County |
2,181 | 0 | 0 | |
|
Cwsc las Lomas Monterey County |
2,132 | 0 | 0 | |
|
City of Portola Portola · Plumas County |
2,100 | 0 | 0 | |
|
Tom Pistachio Water System Madera County |
2,100 | 0 | 0 | |
|
Golden State Water CO Apple Vly North San Bernardino County |
2,097 | 0 | 0 | |
|
Boron Csd Kern County |
2,086 | 0 | 0 | |
|
Crestview Mutual Water CO Ventura County |
2,079 | 0 | 0 | |
|
City of Biggs Biggs · Butte County |
2,060 | 1 | 1 | |
|
Central CA Womens Facility Madera County |
2,046 | 0 | 0 | |
|
Cal American WC las Posas Estates Ventura County |
2,043 | 0 | 0 | |
|
Garberville Sanitary District Humboldt County |
2,041 | 1 | 1 | |
|
Golden State Water Company-Cypress Ridge San Luis Obispo County |
2,032 | 0 | 0 | |
|
Cal American Water Company Piru Ventura County |
2,023 | 0 | 0 | |
|
Vega Vineyard and Farm Santa Barbara County |
2,022 | 0 | 0 | |
|
Redding Rancheria County |
2,015 | 7 | 2 | |
|
Camp Wawona Mariposa County |
2,010 | 1 | 0 | |
|
Fcsa 47 Quail Lake Estates Fresno County |
2,010 | 0 | 0 | |
|
Koehler Winery Santa Barbara County |
2,008 | 0 | 0 | |
|
Buttonwillow Tiger Mart Kern County |
2,006 | 1 | 0 | |
|
Shasta Csa Jones Valley, #6 Shasta County |
2,006 | 1 | 0 | |
|
Csp-Van Damme State Park Mendocino County |
2,004 | 0 | 0 | |
|
Lake County Csa 20 Soda Bay Lake County |
2,003 | 0 | 0 | |
|
American River College Sacramento County |
2,000 | 1 | 1 | |
|
Beale Air Force Base Yuba County |
2,000 | 1 | 0 | |
|
Cal Trans Desert Oasis San Bernardino County |
2,000 | 0 | 0 | |
|
Cal Trans Gaviota Rsr Santa Barbara County |
2,000 | 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.