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 |
|---|---|---|---|---|
|
Cerritos City, Water Dept. Cerritos · Los Angeles County |
46,851 | 1 | 1 | |
|
Oildale Mwc Kern County |
45,315 | 2 | 1 | |
|
Sunny Slope Water Co. Los Angeles County |
25,252 | 1 | 1 | |
|
Norwalk City, Water Dept. Norwalk · Los Angeles County |
20,283 | 1 | 1 | |
|
Humboldt C.s.d. Humboldt County |
19,775 | 2 | 1 | |
|
Riverside Highland Water Company San Bernardino County |
19,053 | 1 | 1 | |
|
Arcata, City of Arcata · Humboldt County |
18,857 | 1 | 1 | |
|
American Canyon, City of American Canyon · Napa County |
18,423 | 1 | 1 | |
|
Ukiah, City of Ukiah · Mendocino County |
16,067 | 1 | 1 | |
|
McFarland, City of Mcfarland · Kern County |
14,161 | 3 | 1 | |
|
Red Hawk Casino Shingle Springs Shingle Springs · County |
11,268 | 2 | 1 | |
|
City of Rio Vista Rio Vista · Solano County |
11,206 | 1 | 1 | |
|
Florin County Water District Sacramento County |
7,831 | 1 | 1 | |
|
City of Dos Palos Dos Palos · Merced County |
7,452 | 2 | 1 | |
|
Pauma County |
5,700 | 1 | 1 | |
|
Calistoga, City of Calistoga · Napa County |
5,610 | 2 | 1 | |
|
St. Helena, City of St. Helena · Napa County |
5,386 | 2 | 1 | |
|
Yosemite Spring Park Util CO Madera County |
5,300 | 3 | 3 | |
|
Armona Community Services Dist Kings County |
4,143 | 1 | 1 | |
|
Acorn Ridge Casino County |
3,640 | 2 | 1 | |
|
Big River Development Big River · County |
3,550 | 9 | 4 | |
|
Cobb Area County Water District Lake County |
3,515 | 2 | 2 | |
|
Weed, City of Weed · Siskiyou County |
2,662 | 2 | 2 | |
|
Smith River C.s.d. Del Norte County |
2,568 | 1 | 1 | |
|
Metro Air Park Water System Sacramento County |
2,500 | 2 | 2 | |
|
Kirkwood Meadows Public Utility District Alpine County |
2,297 | 1 | 1 | |
|
Nacimiento Water Company San Luis Obispo County |
2,191 | 3 | 2 | |
|
Garberville Sanitary District Humboldt County |
2,041 | 1 | 1 | |
|
Redding Rancheria County |
2,015 | 7 | 2 | |
|
American River College Sacramento County |
2,000 | 1 | 1 | |
|
Home Garden Csd Kings County |
1,750 | 1 | 1 | |
|
Dunsmuir, City of Dunsmuir · Siskiyou County |
1,707 | 2 | 1 | |
|
Richgrove Community Services District Tulare County |
1,617 | 8 | 3 | |
|
Lynwood Park Mutual Water Co. Los Angeles County |
1,564 | 1 | 1 | |
|
Los Molinos Comm. Services Dist. Tehama County |
1,450 | 1 | 1 | |
|
McCloud C.s.d. Siskiyou County |
1,317 | 3 | 2 | |
|
California Village County |
1,290 | 5 | 2 | |
|
Malaga County Water District Fresno County |
1,200 | 2 | 1 | |
|
Pg&e San Luis Obispo County |
1,200 | 1 | 1 | |
|
Bellflower Home Garden Water Company Los Angeles County |
1,129 | 1 | 1 | |
|
Bakman Water-Rolling Hills Madera County |
1,107 | 2 | 2 | |
|
North Edwards WD Kern County |
1,105 | 3 | 2 | |
|
Trinidad, City of Trinidad · Humboldt County |
1,072 | 2 | 1 | |
|
Fallsvale Service Company San Bernardino County |
1,046 | 2 | 2 | |
|
Easton Authority Jpa Fresno County |
1,000 | 2 | 2 | |
|
Lakeside School Kern County |
897 | 2 | 1 | |
|
Apple Valley Foothill Cwd San Bernardino County |
841 | 2 | 2 | |
|
John Latoracca Correctional Facility Merced County |
800 | 1 | 1 | |
|
Ponderosa Basin Mutual Wtr CO Mariposa County |
798 | 1 | 1 | |
|
Daggett Comm Svcs Dist San Bernardino County |
795 | 3 | 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.