All water systems in California
2,996 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Cdpr-Hatfield Merced County |
352 | 0 | 0 | |
|
Bear Mountain RV Park Water System Kern County |
350 | 0 | 0 | |
|
Black Meadow Landing San Bernardino County |
350 | 0 | 0 | |
|
Buttonwillow Raceway Park Circuit Kern County |
350 | 0 | 0 | |
|
Caltrans-Honey Lake Srra Lassen County |
350 | 0 | 0 | |
|
Caltrans-Massack Rest Stop Plumas County |
350 | 0 | 0 | |
|
Collins Lake Yuba County |
350 | 0 | 0 | |
|
Hanford First Baptist Church Kings County |
350 | 0 | 0 | |
|
Hidden Springs Cg-State Parks Humboldt County |
350 | 0 | 0 | |
|
Nps-Buckeye Flat Tulare County |
350 | 0 | 0 | |
|
Union Hotel Sonoma County |
350 | 0 | 0 | |
|
Usfs/billy Creek Campground Fresno County |
350 | 0 | 0 | |
|
Bitterbrush Campground Inyo County |
333 | 0 | 0 | |
|
Thunderhill Raceway Glenn County |
331 | 0 | 0 | |
|
Huttopia Six Sigma Campground Lake County |
330 | 0 | 0 | |
|
Jehovah's Witnesses Church Reedley Fresno County |
330 | 2 | 0 | |
|
Pinnacles National Park-West District San Benito County |
328 | 0 | 0 | |
|
Fawn & Stoney Campground Trinity County |
327 | 0 | 0 | |
|
Bidwell Park Golf Course Butte County |
325 | 0 | 0 | |
|
Sunshine Resort San Bernardino County |
325 | 0 | 0 | |
|
Twin Lakes Enterprises Mono County |
325 | 0 | 0 | |
|
Jgw RV Park Shasta County |
324 | 0 | 0 | |
|
Shepherd of the Valley Santa Barbara County |
323 | 0 | 0 | |
|
Joseph Grant County Park Santa Clara County |
322 | 1 | 0 | |
|
Martis Creek-Us Army Corps of Engineers Nevada County |
322 | 0 | 0 | |
|
Pomona Ranch Housing Center Madera County |
322 | 0 | 0 | |
|
Camp Mendocino Mendocino County |
321 | 0 | 0 | |
|
Seven Oaks MT Resort MHP San Bernardino County |
321 | 0 | 0 | |
|
Bethel in the Hills Pcg Camp Kern County |
320 | 0 | 0 | |
|
Trail in RV Park Shasta County |
318 | 0 | 0 | |
|
Trinity Lake Marinas, Llc. Trinity County |
317 | 0 | 0 | |
|
Nps Prns Laguna System Marin County |
316 | 0 | 0 | |
|
Aha Quin County |
315 | 3 | 2 | |
|
Shady Creek Outdoor School Nevada County |
315 | 2 | 0 | |
|
Mid Barrett Cove Mariposa County |
312 | 0 | 0 | |
|
Pg&e Rocky Point CG Plumas County |
312 | 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 | |
|
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 | |
|
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 |
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.