All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Sisquoc Santa Barbara County |
137 | 0 | 0 | |
|
Merrill Gardens Iris Canyon WS Monterey County |
136 | 1 | 1 | |
|
Sierra Christian Camp Tulare County |
136 | 0 | 0 | |
|
Usfs Ah-Di-Na Campground Shasta County |
136 | 0 | 0 | |
|
Wilsona Gardens Mutual Los Angeles County |
136 | 3 | 0 | |
|
Abrams Lake Mobile Estates Siskiyou County |
135 | 1 | 1 | |
|
Cal Fire Ishi Conservation Camp Tehama County |
135 | 0 | 0 | |
|
Calfire-Alder Conservation Camp Del Norte County |
135 | 2 | 2 | |
|
Cherry Valley Ranch LLC Riverside County |
135 | 0 | 0 | |
|
Diamond Arrow Conference Center Nevada County |
135 | 0 | 0 | |
|
Dwr. Vista del Lago Visitor Ctr,vaquerro Los Angeles County |
135 | 0 | 0 | |
|
Flag City Water System San Joaquin County |
135 | 0 | 0 | |
|
Imagery Estate Winery Sonoma County |
135 | 0 | 0 | |
|
Irish Hills Mutual Water CO San Luis Obispo County |
135 | 0 | 0 | |
|
Kelly Mutual Water Company Sonoma County |
135 | 1 | 1 | |
|
Lockheed Martin Skunk Works Los Angeles County |
135 | 0 | 0 | |
|
Madera CO SA16 Sumner Hill Madera County |
135 | 2 | 0 | |
|
McUsd Mariposa Junior High School Mariposa County |
135 | 0 | 0 | |
|
Rams Gate Winery Sonoma County |
135 | 0 | 0 | |
|
Stratos Way Water Company, INC Stanislaus County |
135 | 0 | 0 | |
|
Three Rivers Hideaway Tulare County |
135 | 2 | 1 | |
|
Valley View Trailer Park Riverside County |
135 | 2 | 1 | |
|
Apple Valley Village Mhe San Bernardino County |
134 | 1 | 1 | |
|
Csp-Petaluma Adobe State Historic Park Sonoma County |
134 | 0 | 0 | |
|
Gold Beach Park El Dorado County |
134 | 2 | 0 | |
|
Middle Road Mutual Water CO Ventura County |
134 | 0 | 0 | |
|
Ray's Station Winery Mendocino County |
134 | 0 | 0 | |
|
Thousand Trails Palm Springs MHC Riverside County |
134 | 0 | 0 | |
|
Canyon Crest Mutual Benefit WC San Luis Obispo County |
133 | 0 | 0 | |
|
Ashford Highlands Mwc San Benito County |
132 | 0 | 0 | |
|
Belmont Water Corporation Fresno County |
132 | 0 | 0 | |
|
Big Bear Shores RV Resort San Bernardino County |
132 | 0 | 0 | |
|
Cartago Mutual Water Company Inyo County |
132 | 1 | 0 | |
|
Christmas Cove San Luis Obispo County |
132 | 0 | 0 | |
|
Edna Valley Ranch East San Luis Obispo County |
132 | 0 | 0 | |
|
Fcsa 10 Cumorah Knolls Fresno County |
132 | 0 | 0 | |
|
Kern Valley Mutual Water Company Kern County |
132 | 4 | 3 | |
|
Robbs Resort El Dorado County |
132 | 1 | 0 | |
|
San Simeon Estate Winery San Simeon · San Luis Obispo County |
132 | 0 | 0 | |
|
Sid Quail Canyon Solano County |
132 | 0 | 0 | |
|
Tejon Ranch Main Headquarters Kern County |
132 | 0 | 0 | |
|
Cassel Park Mutual Water CO Shasta County |
131 | 0 | 0 | |
|
Clear Skies Mobile Home Park Los Angeles County |
131 | 0 | 0 | |
|
Country Squire Mobile Estates & Water SY San Joaquin County |
131 | 1 | 0 | |
|
Mountain Valley Apts & Rvp Tehama County |
131 | 1 | 1 | |
|
Palomar Mtn. SP Doane Valley San Diego County |
131 | 0 | 0 | |
|
Treasure Creek Woods Mwc Trinity County |
131 | 1 | 0 | |
|
Whiskeytown Nra-Carr Memorial Shasta County |
131 | 0 | 0 | |
|
Andreini Business Park Water System Shasta County |
130 | 0 | 0 | |
|
Arroyo Center WC Monterey County |
130 | 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.