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 |
|---|---|---|---|---|
|
Angels, City of Angels Camp · Calaveras County |
3,836 | 1 | 0 | |
|
American Valley Csd Plumas County |
3,778 | 1 | 1 | |
|
Mt. Shasta, City of Mount Shasta · Siskiyou County |
3,642 | 1 | 1 | |
|
Big River Development Big River · County |
3,550 | 9 | 4 | |
|
Cobb Area County Water District Lake County |
3,515 | 2 | 2 | |
|
Groveland Community Serv Dist Tuolumne County |
3,400 | 2 | 1 | |
|
Arbuckle Public Utility District Colusa County |
3,251 | 2 | 1 | |
|
Burney Water District Shasta County |
3,000 | 1 | 1 | |
|
Santa Clara Valley Medical Center Santa Clara County |
3,000 | 3 | 2 | |
|
Nps-Grant Grove Fresno County |
2,950 | 1 | 1 | |
|
Nps-Ash Mountain Tulare County |
2,930 | 2 | 1 | |
|
Northgate 880 [sws] Sacramento County |
2,926 | 1 | 1 | |
|
Rio Cosumnes Correctional Center [sws] Sacramento County |
2,800 | 1 | 1 | |
|
Lake Shastina C.s.d Siskiyou County |
2,790 | 1 | 1 | |
|
City of Alturas Alturas · Modoc County |
2,715 | 1 | 1 | |
|
Calif State Polytechnical Univ Pomona Los Angeles County |
2,668 | 2 | 1 | |
|
Weed, City of Weed · Siskiyou County |
2,662 | 2 | 2 | |
|
Rio Mesa High School/oxnard Uhs Ventura County |
2,600 | 1 | 1 | |
|
Fulton Water Company Placer County |
2,593 | 1 | 1 | |
|
Rogina Water Company Inc. Mendocino County |
2,554 | 1 | 1 | |
|
Agate Bay Water Company Placer County |
2,500 | 2 | 1 | |
|
Metro Air Park Water System Sacramento County |
2,500 | 2 | 2 | |
|
O'connor Hospital Santa Clara County |
2,500 | 2 | 1 | |
|
Valley of Enchantment Mwc San Bernardino County |
2,471 | 1 | 1 | |
|
San Juan Bautista, City of San Juan Bautista · San Benito County |
2,335 | 1 | 1 | |
|
Mountain Gate C.s.d. Shasta County |
2,227 | 1 | 1 | |
|
Selma High School Fresno County |
2,225 | 2 | 1 | |
|
Westmorland, City of Westmorland · Imperial County |
2,202 | 3 | 1 | |
|
City of Biggs Biggs · Butte County |
2,060 | 1 | 1 | |
|
Shasta Csa Jones Valley, #6 Shasta County |
2,006 | 1 | 0 | |
|
Mecca Arco Travel Center Riverside County |
1,847 | 1 | 1 | |
|
Fieldbrook Glendale C.s.d. Humboldt County |
1,845 | 1 | 1 | |
|
Inyo County Pwd Lone Pine Inyo County |
1,835 | 4 | 1 | |
|
Vineyard Avenue Acres Mwc Ventura County |
1,820 | 2 | 2 | |
|
Majestic Pines Community SD San Diego County |
1,768 | 1 | 1 | |
|
LE Grand Comm Services Dist Merced County |
1,739 | 2 | 1 | |
|
Seeley Cwd Imperial County |
1,729 | 1 | 1 | |
|
Willow Creek C.s.d. Humboldt County |
1,720 | 1 | 1 | |
|
Dunsmuir, City of Dunsmuir · Siskiyou County |
1,707 | 2 | 1 | |
|
Branch Center [sws] Sacramento County |
1,700 | 1 | 1 | |
|
Lake Don Pedro Csd Tuolumne County |
1,700 | 3 | 1 | |
|
Richgrove Community Services District Tulare County |
1,617 | 8 | 3 | |
|
Callayomi County Water District Lake County |
1,607 | 1 | 1 | |
|
Los Alamitos Race Course Orange County |
1,600 | 1 | 1 | |
|
Inverness Public Utility Dist Marin County |
1,445 | 1 | 1 | |
|
Hydesville Co. W.d. Humboldt County |
1,389 | 3 | 1 | |
|
Aptos High School Santa Cruz County |
1,348 | 1 | 1 | |
|
McCloud C.s.d. Siskiyou County |
1,317 | 3 | 2 | |
|
Sea Ranch Water Company,the (puc) Sonoma County |
1,287 | 3 | 1 | |
|
Green Valley Cwd Los Angeles County |
1,275 | 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.