All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
D'arrigo Harris RD WS #10 Monterey County |
284 | 0 | 0 | |
|
Merquin Elementary School Merced County |
284 | 1 | 0 | |
|
Dean Creek Resort Humboldt County |
283 | 0 | 0 | |
|
Lake Siskiyou M.w.c. Siskiyou County |
281 | 0 | 0 | |
|
Town of Sunol Sfpuc Alameda County |
281 | 0 | 0 | |
|
Wood Camp Water System Nevada County |
281 | 0 | 0 | |
|
Baltimore Aircoiil Company Madera County |
280 | 0 | 0 | |
|
Dolphin Isle Marina Mendocino County |
280 | 0 | 0 | |
|
Greenhorn Creek Csd Plumas County |
280 | 0 | 0 | |
|
Hat Creek Hereford Ranch RV Park Shasta County |
280 | 0 | 0 | |
|
Hornbrook C.s.d. Siskiyou County |
280 | 2 | 1 | |
|
Imperial Manor Mobilehome Community Sacramento County |
280 | 0 | 0 | |
|
Lake Isabella KOA Campground Kern County |
280 | 1 | 0 | |
|
Peppermint Creek MHP Tuolumne County |
280 | 2 | 0 | |
|
Richfield Elementary School Tehama County |
280 | 1 | 0 | |
|
Shepherd of the Mountains Lutheran Churc Kern County |
280 | 0 | 0 | |
|
Skylake Yosemite Camp Madera County |
280 | 0 | 0 | |
|
U.s. Gypsum CO Imperial County |
280 | 1 | 1 | |
|
Woodside RV Park Mendocino County |
280 | 2 | 0 | |
|
Badger Hill Estates Tulare County |
278 | 0 | 0 | |
|
Moose Lodge 2096 San Bernardino County |
278 | 1 | 0 | |
|
Del Oro WC Black Butte District Glenn County |
277 | 0 | 0 | |
|
Prunedale Mwc Monterey County |
277 | 0 | 0 | |
|
Caltrans-Shingletown Srra Shasta County |
275 | 0 | 0 | |
|
Csp-Mendocino Headlands Ford House Mendocino County |
275 | 0 | 0 | |
|
DD Mobile Home Park County |
275 | 9 | 3 | |
|
Golden Feather MHP Butte County |
275 | 0 | 0 | |
|
Jehovah's Witnesses -Corning Tehama County |
275 | 0 | 0 | |
|
Mapache Trailer Park San Joaquin County |
275 | 0 | 0 | |
|
Willow Springs Mobile Home Park Kern County |
275 | 0 | 0 | |
|
Fish Tail Inn Trinity County |
274 | 0 | 0 | |
|
Shasta Csa Sugarloaf, #2 Shasta County |
274 | 1 | 0 | |
|
Manchester Beach KOA Mendocino County |
273 | 0 | 0 | |
|
North Kern Golf Course Kern County |
273 | 0 | 0 | |
|
Pedrazzi Mwc Monterey County |
273 | 0 | 0 | |
|
Walden West Santa Clara County |
273 | 0 | 0 | |
|
Riverkern Mutual Water Company Kern County |
272 | 0 | 0 | |
|
Clay Joint Elementary School Fresno County |
271 | 1 | 1 | |
|
Csp Bodie Shp Mono County |
271 | 0 | 0 | |
|
Alpine Meats INC San Joaquin County |
270 | 2 | 1 | |
|
Enos Lane Public Utility District Kern County |
270 | 0 | 0 | |
|
Farmington Water Company San Joaquin County |
270 | 0 | 0 | |
|
Lawrence Livermore National Lab-Site 300 San Joaquin County |
270 | 0 | 0 | |
|
Montecito Sequoia Lodge Tulare County |
270 | 1 | 0 | |
|
North Muroc Mutual Water Company Kern County |
270 | 0 | 0 | |
|
Park Delta Bay Sacramento County |
270 | 0 | 0 | |
|
Oid #46 Sunset Oaks Stanislaus County |
269 | 0 | 0 | |
|
Rawhide Mutual Water Company Tuolumne County |
269 | 1 | 0 | |
|
Willow Heights Mansion Santa Clara County |
269 | 0 | 0 | |
|
Anzar High School San Benito County |
268 | 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.