Diquat violations in Montana
9 active public water systems in Montana had a Diquat violation in the past three years. What Diquat is and why it matters.
Health effects: Chronic exposure to diquat is associated with cataracts and kidney damage in animal studies. Acute high-level exposure causes gastrointestinal distress. EPA has not classified diquat as a human carcinogen. Individuals with kidney conditions may be at elevated risk from chronic exposure.
Systems with a Diquat violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Wyola Water System County |
281 | 10 | 1 | |
|
Glacier View School County |
265 | 3 | 0 | |
|
Curious Minds Montessori Preschool Stevensville · Ravalli County |
205 | 4 | 1 | |
|
Cskt Division of Fire Management County |
190 | 7 | 1 | |
|
Bucks T4 Big Sky · Gallatin County |
153 | 2 | 0 | |
|
Cmrwa Musselshell Judith Rural Water Sys Harlowton · Wheatland County |
100 | 2 | 0 | |
|
S&k Electronics County |
80 | 3 | 1 | |
|
All West Business Park Lot 3 Bozeman · Gallatin County |
70 | 4 | 0 | |
|
Silver Run School Carbon County |
50 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Diquat, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Diquat 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.