Fluoride violations in Minnesota
5 active public water systems in Minnesota had a Fluoride violation in the past three years. What Fluoride is and why it matters.
Health effects: Above 2 mg/L: dental fluorosis (mottling/pitting of tooth enamel) in children under 8. Above 4 mg/L: skeletal fluorosis (joint pain, increased bone density) after decades of exposure.
Systems with a Fluoride violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Upper Sioux Community County |
1,900 | 3 | 0 | |
|
Grand Portage County |
820 | 13 | 3 | |
|
Bug-O-Nay-Ge-Shig School County |
520 | 6 | 0 | |
|
Ponemah County |
371 | 9 | 1 | |
|
Bug-O-Nay-Ge-Shig School Gym County |
170 | 7 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Fluoride, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Fluoride 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 Minnesota 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.