All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Lassen View Union Elementary School Dist Tehama County |
350 | 1 | 1 | |
|
MD 37 la Vina Madera County |
350 | 1 | 0 | |
|
MT Baldy Homeowners Assn. San Bernardino County |
350 | 0 | 0 | |
|
North Fork Elementary School Madera County |
350 | 1 | 1 | |
|
Nps-Buckeye Flat Tulare County |
350 | 0 | 0 | |
|
Oak View Union Elementary Sch San Joaquin County |
350 | 0 | 0 | |
|
Orwood Resort Contra Costa County |
350 | 2 | 2 | |
|
Sac City Mobile Home Community LP Sacramento County |
350 | 0 | 0 | |
|
Sierra Pacific Industries Richfield Tehama County |
350 | 0 | 0 | |
|
Sierra Pacific Industries Windows Tehama County |
350 | 0 | 0 | |
|
Sunset West Community LLC Fresno County |
350 | 0 | 0 | |
|
Tres Pinos Cwd San Benito County |
350 | 0 | 0 | |
|
Turlock Golf & Country Club Merced County |
350 | 0 | 0 | |
|
Union Hotel Sonoma County |
350 | 0 | 0 | |
|
Usfs/billy Creek Campground Fresno County |
350 | 0 | 0 | |
|
Wildewood East Mutual Sutter County |
350 | 0 | 0 | |
|
Yettem Water System Tulare County |
350 | 1 | 1 | |
|
Musco Family Olive CO San Joaquin County |
348 | 1 | 0 | |
|
The Steward Santa Barbara County |
348 | 0 | 0 | |
|
Cal AM Raymond Madera County |
347 | 0 | 0 | |
|
Del Oro Water Co-Benbow Humboldt County |
347 | 0 | 0 | |
|
Chemeketa Park Mutual Water Company Santa Clara County |
346 | 1 | 0 | |
|
Dixon Migrant Center Solano County |
346 | 1 | 1 | |
|
EL Portal Mobile Estates Sonoma County |
344 | 1 | 1 | |
|
Santa Ysabel Ranch Mwc San Luis Obispo County |
344 | 0 | 0 | |
|
Colonial Park Sonoma County |
342 | 0 | 0 | |
|
Arbor Mobile Home Park WS San Joaquin County |
340 | 0 | 0 | |
|
Leisure Pines Mutual Water CO Tuolumne County |
340 | 3 | 2 | |
|
Ponderosa Csd Tulare County |
340 | 0 | 0 | |
|
Sharondale Mesa HOA Riverside County |
340 | 3 | 0 | |
|
Tooleville Mutual Non Profit Water Assn Tulare County |
340 | 1 | 1 | |
|
Verde Vale Elementary School Shasta County |
340 | 1 | 0 | |
|
Washington School Merced County |
340 | 0 | 0 | |
|
Porterville-Jones Corner Tulare County |
339 | 1 | 1 | |
|
Sunrise Village MHP Stanislaus County |
339 | 1 | 1 | |
|
Aldercroft Heights County Water District Santa Clara County |
338 | 0 | 0 | |
|
Muir Beach Community Marin County |
336 | 0 | 0 | |
|
Plumas Eureka Csd Plumas County |
334 | 0 | 0 | |
|
Bitterbrush Campground Inyo County |
333 | 0 | 0 | |
|
Delta Mutual Water Company Contra Costa County |
333 | 1 | 0 | |
|
Folsom Lake Mutual Water CO Placer County |
333 | 0 | 0 | |
|
Riverside Csd Humboldt County |
333 | 0 | 0 | |
|
Shasta Csa Castella, #3 Shasta County |
333 | 1 | 0 | |
|
Thunderhill Raceway Glenn County |
331 | 0 | 0 | |
|
Del Dios Mutual Water Company San Diego County |
330 | 3 | 0 | |
|
East Nicolaus Joint Union High School Sutter County |
330 | 1 | 0 | |
|
Huttopia Six Sigma Campground Lake County |
330 | 0 | 0 | |
|
Jehovah's Witnesses Church Reedley Fresno County |
330 | 2 | 0 | |
|
Johns Manville Glenn County |
330 | 0 | 0 | |
|
Myers Flat M.w.s. Inc. Humboldt County |
330 | 2 | 1 |
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.