Lead and Copper Rule (LCR) violations in California
404 active public water systems in California had a Lead and Copper Rule (LCR) violation in the past three years, 404 of them in the latest quarter of EPA's data. What Lead and Copper Rule (LCR) is and why it matters.
Systems with a Lead and Copper Rule (LCR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Yokayo Tribe of Indians Mendocino County |
75 | 2 | 2 | |
|
Upper Little Bear Mountain Club San Bernardino County |
72 | 1 | 1 | |
|
Callahan Water District Siskiyou County |
70 | 1 | 1 | |
|
Creekside Mobilehome Park Shasta County |
70 | 2 | 2 | |
|
Golden Valley Municipal Water District Los Angeles County |
70 | 1 | 1 | |
|
H2o, INC San Luis Obispo County |
70 | 1 | 0 | |
|
Hidden Harbor Marina & Rvp Tehama County |
70 | 2 | 2 | |
|
Napa River Ranch Napa County |
70 | 5 | 3 | |
|
North Lone Pine Mutual Water Company Inyo County |
70 | 1 | 1 | |
|
Washington Ridge C.c. Nevada County |
70 | 1 | 1 | |
|
West Valley Mutual Water Company Kern County |
70 | 1 | 1 | |
|
Creekbridge Mutual Water Company San Benito County |
69 | 1 | 1 | |
|
Rancho Villanueva LLC County |
68 | 5 | 1 | |
|
Pinebrook Community Water Well Kern County |
68 | 1 | 1 | |
|
Zonneveld Dairy Cedar Fresno County |
68 | 2 | 1 | |
|
LA Tierra Heights Mutual Napa County |
67 | 2 | 1 | |
|
Sandy Point Mobile Home Park Contra Costa County |
67 | 2 | 2 | |
|
Keeler Community Service District Inyo County |
66 | 2 | 1 | |
|
Santa Rita Water Santa Barbara County |
66 | 1 | 1 | |
|
Wilson Road Water Community Kern County |
66 | 2 | 2 | |
|
Brookside MHP San Bernardino County |
65 | 7 | 3 | |
|
Butte Court Mobile Home Park Del Norte County |
65 | 2 | 1 | |
|
Oak Glen Retreat San Bernardino County |
65 | 2 | 1 | |
|
Country Club County WD Merced County |
64 | 3 | 2 | |
|
Elm Court Fresno County |
64 | 4 | 3 | |
|
Melita Heights Mutual Water Company Sonoma County |
64 | 2 | 2 | |
|
Palomino Estates Water Company Humboldt County |
64 | 4 | 3 | |
|
River Retreat Mutual Water Company Tulare County |
64 | 1 | 1 | |
|
Seawood Estates Mutual Water Company Humboldt County |
63 | 1 | 1 | |
|
Sid Blue Ridge Oaks Solano County |
63 | 1 | 1 | |
|
Angler S Ranch #3 Contra Costa County |
60 | 1 | 1 | |
|
Gazelle School Siskiyou County |
60 | 1 | 1 | |
|
Martin's Mobile Home Court Stanislaus County |
60 | 2 | 1 | |
|
Mid Valley Nut CO Hughson · Stanislaus County |
60 | 3 | 2 | |
|
Reynolds Consumer Products (red Bluff) Tehama County |
60 | 2 | 2 | |
|
Royal Oak Place WS Monterey County |
60 | 1 | 1 | |
|
Whale Gulch School Mendocino County |
60 | 2 | 2 | |
|
Willow Pass Bussiness Park Water System Contra Costa County |
60 | 1 | 1 | |
|
Brookside Estates Mutual Water Company Inyo County |
59 | 2 | 1 | |
|
Brethren Heritage School, INC Stanislaus County |
55 | 2 | 2 | |
|
Country Western Mhrv Stanislaus County |
55 | 1 | 1 | |
|
Sierra Cascade Nursery Lassen County |
55 | 1 | 1 | |
|
Spca WS Monterey County |
55 | 1 | 1 | |
|
Corda RD WS Monterey County |
54 | 3 | 1 | |
|
Sequoia Water Assoc Sacramento County |
54 | 2 | 2 | |
|
Walking M Ranches Santa Barbara County |
54 | 2 | 1 | |
|
Wespak, Inc. Tulare County |
53 | 2 | 1 | |
|
Bucher Water Company Sonoma County |
52 | 1 | 1 | |
|
San Felipe Water System County |
52 | 1 | 1 | |
|
Occidental Arts & Ecology Center Sonoma County |
51 | 2 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Lead and Copper Rule (LCR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Lead and Copper Rule (LCR) alone.
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.