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 |
|---|---|---|---|---|
|
Cove Mobile Villa Siskiyou County |
105 | 1 | 1 | |
|
Beaulieu Vineyard Napa County |
100 | 1 | 0 | |
|
Bradley Union School WS Monterey County |
100 | 2 | 1 | |
|
Cemex Calif Cement LLC VV San Bernardino County |
100 | 1 | 1 | |
|
Guatay Mutual Benefit Corporation San Diego County |
100 | 4 | 1 | |
|
Hess Winery Napa County |
100 | 2 | 1 | |
|
Lytle Creek Administration Site San Bernardino County |
100 | 5 | 3 | |
|
Montecito Sea Meadows Santa Barbara County |
100 | 1 | 1 | |
|
Omya California, a Division of Omya INC San Bernardino County |
100 | 2 | 1 | |
|
Pleasant Valley Elementary San Luis Obispo County |
100 | 1 | 0 | |
|
Rancho Borromeo Mwc Monterey County |
100 | 1 | 1 | |
|
San Miguel WS #01 Monterey County |
100 | 2 | 2 | |
|
Sandmound Mutual Contra Costa County |
100 | 2 | 2 | |
|
SO Trinity Unified School Dist. Trinity County |
100 | 1 | 1 | |
|
Anglers Subdivision 4 Contra Costa County |
99 | 1 | 1 | |
|
Ocotillo Oasis, LLC San Diego County |
96 | 3 | 1 | |
|
Big Springs Union Elem. School Siskiyou County |
95 | 2 | 2 | |
|
Yokohl Mutual Water CO Tulare County |
95 | 5 | 2 | |
|
Bella Vista Water Sys Contra Costa County |
93 | 3 | 2 | |
|
Lomas del Sol Mws Monterey County |
93 | 1 | 1 | |
|
Randal's Ranchette Mutual Water Company Sonoma County |
93 | 2 | 2 | |
|
Robley Property Mws Monterey County |
92 | 1 | 1 | |
|
Vista del Toro WS Monterey County |
92 | 2 | 1 | |
|
Clark Street Community Well Kern County |
90 | 3 | 3 | |
|
South Cloverdale Water Company Sonoma County |
90 | 2 | 2 | |
|
Camp Denver Fox San Diego County |
86 | 1 | 1 | |
|
Bassi Ranch Mutual Water Co. San Luis Obispo County |
85 | 2 | 1 | |
|
Kern Ridge Growers Kern County |
85 | 1 | 1 | |
|
Mjusd Dobbins School Yuba County |
85 | 3 | 2 | |
|
Stoco Mutual Water Company Kern County |
85 | 2 | 2 | |
|
White's Steel, Inc. Riverside County |
85 | 3 | 3 | |
|
Lake San Antonio MHP WS Monterey County |
84 | 1 | 1 | |
|
Floricultura Pacific WS Monterey County |
82 | 1 | 1 | |
|
Blue Oak Terrace Mutual Butte County |
81 | 2 | 1 | |
|
Hidden Valley WA Monterey County |
81 | 3 | 2 | |
|
Mesa Grande Black Canyon County |
81 | 3 | 1 | |
|
At&t Water System Stanislaus County |
80 | 1 | 1 | |
|
Cal Fire-High Rock Conservation Camp Humboldt County |
80 | 3 | 2 | |
|
Morning Star King, LLC Kings County |
80 | 1 | 1 | |
|
Lion Raisins Packing Company Fresno County |
80 | 1 | 1 | |
|
Locke Water Works CO [sws] Sacramento County |
80 | 1 | 1 | |
|
Sobre Vista Water Company Sonoma County |
80 | 1 | 1 | |
|
Valley Home School Texas Stanislaus County |
80 | 1 | 1 | |
|
Yosemite Vista Estates Tuolumne County |
80 | 2 | 1 | |
|
Big Bear Administration San Bernardino County |
75 | 3 | 3 | |
|
Duarte Nursery INC Water System Stanislaus County |
75 | 2 | 1 | |
|
Friendly Acres MHP Tehama County |
75 | 2 | 2 | |
|
Golden Oaks Mobile Home Park Butte County |
75 | 3 | 0 | |
|
Tierra Bonita Mutual Water Los Angeles County |
75 | 1 | 1 | |
|
Waddington W.w. Humboldt County |
75 | 3 | 2 |
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.