All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Jackson Valley Irrigation District Amador County |
1,303 | 1 | 0 | |
|
Caltrans Shandon Rest Stop San Luis Obispo County |
1,300 | 1 | 0 | |
|
Slo Cwwd No. 23 Santa Margarita San Luis Obispo County |
1,291 | 0 | 0 | |
|
California Village County |
1,290 | 5 | 2 | |
|
Sea Ranch Water Company,the (puc) Sonoma County |
1,287 | 3 | 1 | |
|
Del Oro River Island Serv Terr #1 Tulare County |
1,277 | 2 | 0 | |
|
Stratford Pud Kings County |
1,277 | 0 | 0 | |
|
Green Valley Cwd Los Angeles County |
1,275 | 1 | 1 | |
|
Dwp Fawnskin San Bernardino County |
1,271 | 0 | 0 | |
|
Montague, City of Montague · Siskiyou County |
1,264 | 1 | 1 | |
|
Highland Mobile Home Park Inyo County |
1,260 | 1 | 1 | |
|
McCabe Union School Imperial County |
1,250 | 0 | 0 | |
|
Defense Distrib. Depot Tracy Site San Joaquin County |
1,249 | 0 | 0 | |
|
Laguna Seca Recreation WS Monterey County |
1,248 | 2 | 1 | |
|
Tahoe City Pud McKinney/quail Tahoe City · Placer County |
1,245 | 0 | 0 | |
|
Howell Mountain Mutual Water Company Napa County |
1,244 | 0 | 0 | |
|
Kettleman City Csd Kettleman City · Kings County |
1,242 | 1 | 1 | |
|
Sbdno County Service Area 70 Cedar Glen San Bernardino County |
1,240 | 1 | 0 | |
|
Ellery Lake Campground Mono County |
1,225 | 0 | 0 | |
|
San Pasqual District a County |
1,225 | 1 | 0 | |
|
Nps-Devils Postpile Madera County |
1,220 | 0 | 0 | |
|
Rio Bravo Greeley School Water System Kern County |
1,219 | 1 | 0 | |
|
Gateway Imperial County |
1,215 | 0 | 0 | |
|
Hidden Valley Nature Center Riverside County |
1,210 | 0 | 0 | |
|
Self-Serve Petroleum Solano County |
1,210 | 0 | 0 | |
|
Redway C.s.d. Humboldt County |
1,207 | 2 | 0 | |
|
Csp Henry W. Coe State Park Santa Clara County |
1,205 | 0 | 0 | |
|
Nps Prns Lighthouse Marin County |
1,202 | 0 | 0 | |
|
Adventure Mtn Lodge El Dorado County |
1,200 | 0 | 0 | |
|
Evergreen Union School District Tehama County |
1,200 | 0 | 0 | |
|
Gerber las Flores Csd Tehama County |
1,200 | 0 | 0 | |
|
Grimmway Enterprises-Malaga Water System Kern County |
1,200 | 2 | 0 | |
|
Malaga County Water District Fresno County |
1,200 | 2 | 1 | |
|
Nasa Ames Research Center Santa Clara County |
1,200 | 0 | 0 | |
|
Nps Prns Glen and Wildcat Campgrounds Marin County |
1,200 | 0 | 0 | |
|
Pg&e San Luis Obispo County |
1,200 | 1 | 1 | |
|
Shant Bhavan Punjabi Funeral Home Fresno · Fresno County |
1,200 | 1 | 0 | |
|
Sierra Army Depot Lassen County |
1,200 | 1 | 1 | |
|
Slocsa #10a Cayucos San Luis Obispo County |
1,200 | 0 | 0 | |
|
Starbucks San Joaquin County |
1,200 | 0 | 0 | |
|
Tnf-Logger & Stampede RC Sierra County |
1,200 | 0 | 0 | |
|
Valley Evangelical Free Church Solano County |
1,200 | 0 | 0 | |
|
Vineyard Ave Estates Mwc Ventura County |
1,200 | 1 | 1 | |
|
Usmc Yermo Annex San Bernardino County |
1,184 | 0 | 0 | |
|
Mt. Hermon Association, Inc. Santa Cruz County |
1,176 | 1 | 1 | |
|
Maxwell Public Utility District Colusa County |
1,175 | 1 | 1 | |
|
Pumice Flats Campground Madera County |
1,173 | 0 | 0 | |
|
Blue Lake, City of Blue Lake · Humboldt County |
1,172 | 1 | 0 | |
|
Fairoaks PWS #44 San Joaquin County |
1,172 | 0 | 0 | |
|
Barona North Barona North Reservation · County |
1,171 | 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.