Cyanide violations in Minnesota
12 active public water systems in Minnesota had a Cyanide violation in the past three years. What Cyanide is and why it matters.
Health effects: Acute high-dose cyanide exposure interferes with cellular oxygen use and can cause rapid deterioration of the central nervous system, including headache, dizziness, and in severe cases, loss of consciousness. Chronic exposure at lower levels is associated with thyroid dysfunction and nerve damage. Most drinking water violations pose chronic rather than acute risk.
Systems with a Cyanide violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Northside County |
2,086 | 3 | 0 | |
|
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 | |
|
Ball Club County |
333 | 3 | 0 | |
|
Inger County |
186 | 4 | 0 | |
|
Bug-O-Nay-Ge-Shig School Gym County |
170 | 7 | 0 | |
|
Bena County |
112 | 3 | 0 | |
|
Plantation County |
105 | 3 | 0 | |
|
Oak Point County |
45 | 3 | 0 | |
|
Old Agency County |
30 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Cyanide, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Cyanide 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.