Long Term 2 Enhanced Surface Water Treatment Rule (LT2) violations in California
10 active public water systems in California had a Long Term 2 Enhanced Surface Water Treatment Rule (LT2) violation in the past three years, 9 of them in the latest quarter of EPA's data. What Long Term 2 Enhanced Surface Water Treatment Rule (LT2) is and why it matters.
Systems with a Long Term 2 Enhanced Surface Water Treatment Rule (LT2) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Yucaipa Valley Water District San Bernardino County |
52,202 | 3 | 0 | |
|
Orleans C.s.d. Humboldt County |
636 | 4 | 3 | |
|
Havasu Water Company County |
361 | 11 | 4 | |
|
Pauma Valley Water Company San Diego County |
185 | 5 | 2 | |
|
Copco Lake Mwc Siskiyou County |
181 | 2 | 2 | |
|
Grindstone Rancheria County |
150 | 9 | 4 | |
|
Burnt Ranch Estates Trinity County |
115 | 2 | 2 | |
|
Orleans Mutual Water Company Humboldt County |
85 | 2 | 2 | |
|
Gsa Calexico Port of Entry Imperial County |
25 | 2 | 2 | |
|
River Grove Mutual Water Assn Santa Cruz County |
54 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Long Term 2 Enhanced Surface Water Treatment Rule (LT2), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Long Term 2 Enhanced Surface Water Treatment Rule (LT2) 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.