Total Haloacetic Acids (HAA5) violations in California
120 active public water systems in California had a Total Haloacetic Acids (HAA5) violation in the past three years, 6 of them in the latest quarter of EPA's data. What Total Haloacetic Acids (HAA5) is and why it matters.
Systems with a Total Haloacetic Acids (HAA5) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Allied Waste of Imperial Valley Imperial County |
45 | 2 | 1 | |
|
Darr Water CO San Bernardino County |
43 | 4 | 1 | |
|
Imperial Lakes Inc. Imperial County |
40 | 2 | 0 | |
|
Hilton Mutual Water Company Sonoma County |
36 | 1 | 0 | |
|
Cold Springs Subdivision Cold Springs Rancheria · County |
35 | 8 | 3 | |
|
Madrona Manor Sonoma County |
34 | 2 | 0 | |
|
UC Desert Research and Extension Center Imperial County |
33 | 2 | 0 | |
|
Haykingdom, Inc. Imperial · Imperial County |
32 | 2 | 1 | |
|
Bridgehaven Park Sonoma County |
30 | 2 | 0 | |
|
Golden State Water Company South Shore Lake County |
30 | 2 | 1 | |
|
Iid North End Consolidation Imperial County |
30 | 2 | 1 | |
|
Cedar Lodge Mariposa County |
28 | 1 | 0 | |
|
Pine Hill Terrace Mobile Home Park Sonoma County |
27 | 1 | 0 | |
|
Park Investments Water System Tulare County |
26 | 1 | 0 | |
|
Moreton Bay Professional Plaza Santa Barbara County |
25 | 6 | 1 | |
|
Nps Death Valley, Stovepipe Wells Inyo County |
25 | 1 | 0 | |
|
Rincon Water & Road Works Ventura County |
25 | 1 | 0 | |
|
Tule River Apple Valley County |
25 | 3 | 0 | |
|
Harris Feeding Company Fresno County |
22 | 1 | 0 | |
|
Foothill Municipal Water Dist. Los Angeles County |
0 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Total Haloacetic Acids (HAA5), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Total Haloacetic Acids (HAA5) 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.