Lead and Copper Rule Revisions (LCRR) violations in California
842 active public water systems in California had a Lead and Copper Rule Revisions (LCRR) violation in the past three years, 844 of them in the latest quarter of EPA's data. What Lead and Copper Rule Revisions (LCRR) is and why it matters.
Systems with a Lead and Copper Rule Revisions (LCRR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Crass Mutual Water Company Madera County |
80 | 1 | 1 | |
|
Hidden Acres Trailer Villa Solano County |
80 | 1 | 1 | |
|
John Hovannisian Water System Madera County |
80 | 8 | 1 | |
|
Lancaster Water Company Los Angeles County |
80 | 1 | 1 | |
|
Live Oak Acres Mwc Inc. Tehama County |
80 | 2 | 1 | |
|
Pajaro Valley Greenhouse WS Monterey County |
80 | 2 | 1 | |
|
Pineview Mobile Home Park Lassen County |
80 | 2 | 1 | |
|
Usda Agricultural Research Service Fresno County |
80 | 1 | 1 | |
|
Clio Public Utility District Plumas County |
79 | 1 | 1 | |
|
Big Rise Village Shasta County |
78 | 2 | 1 | |
|
A1 Winstons Mobile Home Park San Joaquin County |
75 | 2 | 1 | |
|
Apple Ave WS #02 Monterey County |
75 | 2 | 1 | |
|
Big Bear Administration San Bernardino County |
75 | 3 | 3 | |
|
Breese Subdivision 2 Tehama County |
75 | 2 | 1 | |
|
Ferrari-Carano Winery Sonoma County |
75 | 1 | 1 | |
|
Friendly Acres MHP Tehama County |
75 | 2 | 2 | |
|
Green Gulch Farm Marin County |
75 | 1 | 1 | |
|
Harbor View WA Monterey County |
75 | 1 | 1 | |
|
Howell's Lakeside Water Co. Tehama County |
75 | 2 | 1 | |
|
Waddington W.w. Humboldt County |
75 | 3 | 2 | |
|
Yokayo Tribe of Indians Mendocino County |
75 | 2 | 2 | |
|
Pike Ranch Mutual Water CO Madera County |
74 | 4 | 1 | |
|
Countryside Estates Mwc Monterey County |
73 | 1 | 1 | |
|
Glenn Ave WS #01 Monterey County |
73 | 1 | 1 | |
|
Thermal Park Riverside County |
73 | 2 | 0 | |
|
Andy's Produce Market, Inc. Sonoma County |
71 | 1 | 1 | |
|
Sun Oaks Racquet Club Shasta County |
71 | 1 | 1 | |
|
The Village Mobile Home Park Los Angeles County |
71 | 2 | 1 | |
|
Arroyo Seco Estates Mws Monterey County |
70 | 2 | 1 | |
|
Brush and Old Well Mutual Water Company Santa Clara County |
70 | 1 | 1 | |
|
Creekside Mobilehome Park Shasta County |
70 | 2 | 2 | |
|
Deer Meadow Mutual Water Company Tulare County |
70 | 1 | 1 | |
|
Hidden Harbor Marina & Rvp Tehama County |
70 | 2 | 2 | |
|
Little Valley Csd Lassen County |
70 | 2 | 1 | |
|
Napa River Ranch Napa County |
70 | 5 | 3 | |
|
New Meadows Tehama County |
70 | 2 | 1 | |
|
Plum Valley Elem School (new School) Tehama County |
70 | 1 | 1 | |
|
Sierra Pines Mobile Home Park Alpine County |
70 | 1 | 1 | |
|
Valley Mobile Home Park Imperial County |
70 | 3 | 1 | |
|
Westley Csd Stanislaus County |
70 | 1 | 1 | |
|
Bogle Family Limited Partner Yolo County |
69 | 1 | 1 | |
|
Hardwick Water Company Kings County |
69 | 1 | 1 | |
|
Leafwood Community WA Monterey County |
69 | 1 | 1 | |
|
LA Tierra Heights Mutual Napa County |
67 | 2 | 1 | |
|
Mineral Mountain Mutual Water Calaveras County |
67 | 1 | 1 | |
|
Moro Cojo Mwa Monterey County |
67 | 2 | 1 | |
|
Sandy Point Mobile Home Park Contra Costa County |
67 | 2 | 2 | |
|
Murphy Hill WS #02 Monterey County |
66 | 1 | 1 | |
|
Rancho Pino Verde San Bernardino County |
66 | 1 | 1 | |
|
Rolling Hills Mutual Water Company Santa Barbara County |
66 | 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 Revisions (LCRR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Lead and Copper Rule Revisions (LCRR) 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.