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 |
|---|---|---|---|---|
|
Crystal Lake Property Owners San Bernardino County |
163 | 2 | 1 | |
|
Bar H Mwc San Bernardino County |
155 | 5 | 4 | |
|
Mjusd Browns Valley School Yuba County |
155 | 2 | 2 | |
|
Bella Lago Mobile Home Park Lake County |
152 | 2 | 2 | |
|
Stone Creek Water Company Riverside County |
152 | 2 | 2 | |
|
Bud Antle, Llc Marina Facility WS Monterey County |
151 | 3 | 2 | |
|
Casmalia Community Services District Santa Barbara County |
150 | 1 | 1 | |
|
Grindstone Rancheria County |
150 | 9 | 4 | |
|
Hines Nurseries Winters North Solano County |
150 | 2 | 1 | |
|
Meadowlark Ranches Mutual Water Company Santa Barbara County |
150 | 1 | 1 | |
|
Mjusd Loma Rica School Yuba County |
150 | 2 | 2 | |
|
Prunedale Shopping Center WS Monterey County |
150 | 1 | 1 | |
|
Mulberry MHP Stanislaus County |
148 | 1 | 1 | |
|
McGee Creek Mobile Home Park Mono County |
146 | 1 | 1 | |
|
Siskiyou Co.service Area #5/carrick Siskiyou County |
143 | 2 | 2 | |
|
Pine Grove Mobile Home Park Del Norte County |
142 | 2 | 2 | |
|
Desert Palms Mobile Home Park Los Angeles County |
140 | 1 | 1 | |
|
Harris Farms Headquarters Fresno County |
140 | 2 | 1 | |
|
Maywood Mobile Home Park Tehama County |
140 | 2 | 2 | |
|
Plainview Mwc Central Water Tulare County |
138 | 2 | 2 | |
|
Trinity Knolls Mutual Water Company Trinity County |
138 | 2 | 2 | |
|
Merrill Gardens Iris Canyon WS Monterey County |
136 | 1 | 1 | |
|
Calfire-Alder Conservation Camp Del Norte County |
135 | 2 | 2 | |
|
Kern Valley Mutual Water Company Kern County |
132 | 4 | 3 | |
|
Coastlands Mws (post Creek) Monterey County |
129 | 1 | 1 | |
|
Bar-Len Mwc San Bernardino County |
126 | 5 | 2 | |
|
Camphora Apartments Monterey County |
126 | 2 | 1 | |
|
Riverview Mobile Home Park Contra Costa County |
126 | 1 | 1 | |
|
Shadow Mountain MHP Siskiyou County |
126 | 1 | 1 | |
|
Burnt Ranch School Trinity County |
125 | 3 | 2 | |
|
Foley Family Wines Chateau St. Jean Sonoma County |
125 | 1 | 1 | |
|
Creekside Cabins & RV Resort Mendocino County |
124 | 2 | 2 | |
|
Gilbert Street Complex San Bernardino County |
124 | 2 | 1 | |
|
Phillipsville C.s.d. Humboldt County |
124 | 2 | 2 | |
|
Sierra King Homeowners Assn Tulare County |
124 | 1 | 1 | |
|
Bethel Island Mutual Water CO Contra Costa County |
123 | 1 | 1 | |
|
Liberty Packing Company LLC Merced County |
120 | 1 | 1 | |
|
Libitzky Stanislaus County |
120 | 1 | 1 | |
|
New Auberry Water Association Fresno County |
120 | 3 | 1 | |
|
Sugar Pine Homeowners Assoc Madera County |
120 | 2 | 2 | |
|
HI Desert Mwc San Bernardino County |
112 | 4 | 2 | |
|
West Park Properties Del Norte County |
112 | 2 | 2 | |
|
Cdf-Chamberlain Creek Conservation Camp Mendocino County |
110 | 1 | 1 | |
|
Chisan Orchids Nursery Santa Barbara County |
110 | 1 | 1 | |
|
Crystal Geyser Bottling Plant Inyo County |
110 | 1 | 1 | |
|
Del Rio East HOA Water System Stanislaus County |
110 | 1 | 1 | |
|
Mjusd Cordua School Yuba County |
110 | 2 | 2 | |
|
Russos Mobile Park Contra Costa County |
110 | 2 | 2 | |
|
International Paper Exeter Bulk Tulare County |
106 | 2 | 1 | |
|
Kings River Estates Mutual Water Company Tulare County |
106 | 1 | 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.