Long Term 2 Enhanced Surface Water Treatment Rule (LT2) violations in Montana
7 active public water systems in Montana had a Long Term 2 Enhanced Surface Water Treatment Rule (LT2) violation in the past three years, 1 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 |
|---|---|---|---|---|
|
Two Medicine Water East Glacier County |
1,504 | 3 | 1 | |
|
Havre City of Havre · Hill County |
9,921 | 5 | 0 | |
|
Miles City City of Miles City · Custer County |
9,565 | 2 | 0 | |
|
Denton Town of Denton · Fergus County |
255 | 2 | 1 | |
|
Carter Chouteau CO Water Dist Carter · Chouteau County |
150 | 2 | 0 | |
|
E Bar L Ranch Greenough · Missoula County |
84 | 2 | 0 | |
|
Big Stack Estates Great Falls · Cascade County |
60 | 1 | 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 Montana 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.