Interim Enhanced Surface Water Treatment Rule violations in California
15 active public water systems in California had a Interim Enhanced Surface Water Treatment Rule violation in the past three years, 1 of them in the latest quarter of EPA's data. What Interim Enhanced Surface Water Treatment Rule is and why it matters.
Systems with a Interim Enhanced Surface Water Treatment Rule violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Pauma Valley Water Company San Diego County |
185 | 5 | 2 | |
|
Springville Pud Tulare County |
1,500 | 1 | 0 | |
|
Redway C.s.d. Humboldt County |
1,207 | 2 | 0 | |
|
Scotia Csd Humboldt County |
681 | 4 | 1 | |
|
Lewiston Community Services District Trinity County |
677 | 2 | 1 | |
|
Whitehawk Ranch Mwc Plumas County |
540 | 1 | 0 | |
|
Yurok Weitchpec County |
120 | 5 | 0 | |
|
Yurok Wautec County |
96 | 5 | 0 | |
|
Junction City School Junction City · Trinity County |
80 | 2 | 0 | |
|
Yurok Kepel County |
76 | 7 | 1 | |
|
Branscomb Mobile Home Park Mendocino County |
42 | 3 | 2 | |
|
Hudson Ranch Power I LLC Imperial County |
39 | 1 | 0 | |
|
Bridgehaven Park Sonoma County |
30 | 2 | 0 | |
|
Kyburz Mutual Water Company El Dorado County |
30 | 5 | 0 | |
|
Yurok McCoy Kenek County |
30 | 6 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Interim Enhanced Surface Water Treatment Rule, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Interim Enhanced Surface Water Treatment Rule 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.