All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Nps Prns Laguna System Marin County |
316 | 0 | 0 | |
|
Aha Quin County |
315 | 3 | 2 | |
|
Mill Creek Msc San Bernardino County |
315 | 0 | 0 | |
|
San Lucas County Water District Monterey County |
315 | 1 | 0 | |
|
Shady Creek Outdoor School Nevada County |
315 | 2 | 0 | |
|
Sierra Pacific Industries Quincy Plumas County |
315 | 1 | 1 | |
|
E & J Gallo Winery Merced County |
313 | 0 | 0 | |
|
Stockdale Ranchos Mutual Water CO Kern County |
313 | 0 | 0 | |
|
Mid Barrett Cove Mariposa County |
312 | 0 | 0 | |
|
Pg&e Rocky Point CG Plumas County |
312 | 0 | 0 | |
|
Owens Valley Water Resources, Inc. Inyo County |
311 | 0 | 0 | |
|
Smud Powerpines Camp El Dorado County |
311 | 0 | 0 | |
|
Arco Brawley and Hwy 180 Fresno County |
310 | 0 | 0 | |
|
Cache Creek Vineyards Lake County |
310 | 0 | 0 | |
|
Calizona RV Park San Bernardino County |
310 | 0 | 0 | |
|
Camp Cedar Crest San Bernardino County |
310 | 1 | 0 | |
|
Csp Samuel Taylor ST Park Marin County |
310 | 0 | 0 | |
|
June Lake Pud Down Canyon Mono County |
310 | 1 | 1 | |
|
Lower Rock Creek Mutual Water Co. Mono County |
310 | 1 | 1 | |
|
Pine Mountain Mutual Water Co. Mendocino County |
310 | 2 | 1 | |
|
San Joaquin Water Works #2 San Joaquin County |
310 | 0 | 0 | |
|
Sebastopol Charter School Sonoma County |
310 | 0 | 0 | |
|
Siskiyou Lake Highlands Mwc Siskiyou County |
310 | 1 | 1 | |
|
Toca Madera Winery Madera County |
310 | 1 | 0 | |
|
Alpine Retreat and Camp San Bernardino County |
309 | 0 | 0 | |
|
Manzanita Park WS Monterey County |
309 | 0 | 0 | |
|
Potter Valley School District Mendocino County |
309 | 1 | 1 | |
|
Deshmesh Darbar Lodi/stk Water Sys San Joaquin County |
308 | 0 | 0 | |
|
Trinity Alps Resort Trinity County |
307 | 0 | 0 | |
|
Autocamp-Yosemite Mariposa County |
306 | 0 | 0 | |
|
Jack's Gas #2 Fresno County |
306 | 0 | 0 | |
|
Las Cruces State Park Santa Barbara County |
306 | 0 | 0 | |
|
Newberry Springs Gas Station & Mini-Mart San Bernardino County |
306 | 1 | 0 | |
|
Bishop Creek Lodge Inyo County |
305 | 0 | 0 | |
|
New Avenue Mutual Water Company Santa Clara County |
305 | 0 | 0 | |
|
River Ranch Mobile Home Park Tehama County |
305 | 2 | 1 | |
|
Rincon Paradise Creek County |
305 | 0 | 0 | |
|
Aeronautical Systems San Bernardino County |
304 | 0 | 0 | |
|
Easton Presbyterian Church Fresno County |
304 | 2 | 0 | |
|
Grace Valley Christian Center Yolo County |
304 | 0 | 0 | |
|
Ocean Cove Store & Campground Sonoma County |
304 | 0 | 0 | |
|
Petrified Forest Sonoma County |
304 | 0 | 0 | |
|
Santa Ynez Rancho Estates Santa Barbara County |
304 | 0 | 0 | |
|
Apple Valley View Mwc San Bernardino County |
303 | 0 | 0 | |
|
Cutler Park Tulare County |
303 | 0 | 0 | |
|
Rand Communities Water District Kern County |
303 | 4 | 3 | |
|
5033 Pentecost Stanislaus County |
302 | 0 | 0 | |
|
Boulder Creek Scout Reserv. Santa Cruz County |
302 | 1 | 0 | |
|
Easton Estates Water Company Fresno County |
302 | 0 | 0 | |
|
Huntington Pines Mutual Company Fresno County |
302 | 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.