All water systems in California
284 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Millerton Lake South Shore County |
93,204 | 0 | 0 | |
|
Nps Lassen Volcanic NP Nc Butte Lake C · San Benito County |
15,000 | 0 | 0 | |
|
Millerton Lake Fresno County |
7,500 | 0 | 0 | |
|
Forest Lake Golf Course San Joaquin County |
5,000 | 0 | 0 | |
|
Lake Elsinore-City Lake Elsinore · Riverside County |
4,500 | 0 | 0 | |
|
Dwp Sugarloaf/erwin Lake San Bernardino County |
3,422 | 0 | 0 | |
|
Twin Lakes State Beach Santa Cruz County |
3,013 | 0 | 0 | |
|
Lake Pardee Rec Area County |
3,000 | 0 | 0 | |
|
Elsinore WD Lakeland Riverside County |
2,017 | 0 | 0 | |
|
Lake Berryessa Marina Resort Inactive Napa County |
2,000 | 0 | 0 | |
|
Antelope Valley Water CO China Lake Acre · Nevada County |
1,000 | 0 | 0 | |
|
Lake Solano Picnic Area Solano County |
1,000 | 0 | 0 | |
|
Legg Lake County Park-Whittier Narrows Los Angeles County |
1,000 | 0 | 0 | |
|
Yosemite Nps-Tenaya Lake Nc Tenaya Lake · Santa Clara County |
1,000 | 0 | 0 | |
|
Lake Alpine Camp Ground Alpine County |
945 | 0 | 0 | |
|
EL Dorado Irrigation District Lake Hills Esta · Lake County |
750 | 0 | 0 | |
|
Blue Lake Upper Blue Alpine County |
672 | 0 | 0 | |
|
Lake Cuyamaca Park & Rec. County |
600 | 0 | 0 | |
|
Lakes Basin CG #2-Plumas NF County |
600 | 0 | 0 | |
|
Lake County Csa 6 Finley Lake County |
590 | 1 | 1 | |
|
Tud-Cuesta Center-Lambert Lakes Tuolumne County |
533 | 1 | 1 | |
|
Lakeview Hills Community Assn Placer County |
512 | 0 | 0 | |
|
Oakwood Lake Resort San Joaquin County |
501 | 0 | 0 | |
|
Camp Far West Lake, South Side Placer County |
500 | 0 | 0 | |
|
Lake Cahuilla County Park Riverside County |
500 | 0 | 0 | |
|
Lakeside Trailer Park Tulare County |
500 | 0 | 0 | |
|
Morning Star Lake Resort Placer County |
500 | 0 | 0 | |
|
Shaver Lake Heights Fresno County |
500 | 0 | 0 | |
|
Turlock Lake State Park Stanislaus County |
500 | 0 | 0 | |
|
Woodlake Conservation Center Tulare County |
500 | 0 | 0 | |
|
Woodlake Conservation Center Tulare County |
500 | 0 | 0 | |
|
Twin Lakes Family Campground 2 Mono County |
470 | 0 | 0 | |
|
Lakeview Hills Community Assn Lakeview Hills · Placer County |
440 | 0 | 0 | |
|
Turlock Lake Sra Day Use Area Merced County |
420 | 0 | 0 | |
|
Lake Forest Water CO Placer County |
400 | 0 | 0 | |
|
Lake Sherwood Ventura County |
400 | 0 | 0 | |
|
Lake Vera M.w.c. County |
400 | 0 | 0 | |
|
Ruth Lake C S D Trinity County |
400 | 0 | 0 | |
|
Placer County Water Agency Lake Shore Esta · Placer County |
373 | 0 | 0 | |
|
Lakeland Water Company Kern County |
370 | 0 | 0 | |
|
Clawa Lake Arrowhead Crest Est San Bernardino County |
368 | 1 | 1 | |
|
Lost Lake Resort County |
355 | 1 | 0 | |
|
Hensley Lake Hidden Dam County |
350 | 0 | 0 | |
|
Westlake Village MHP Tulare County |
350 | 0 | 0 | |
|
Leisure Lake Mobile Home Los Angeles County |
325 | 1 | 1 | |
|
Forest Lake Christian School Nevada County |
300 | 0 | 0 | |
|
Jackson Lakes Golf Course Kings County |
300 | 0 | 0 | |
|
Lake Elizabeth Mutual Water CO County |
272 | 0 | 0 | |
|
Silver Lake Campground County |
260 | 0 | 0 | |
|
Lake Berryessa Park Napa County |
250 | 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.