Tapcensus

Selenium violations in Minnesota

5 active public water systems in Minnesota had a Selenium violation in the past three years. What Selenium is and why it matters.

Health effects: Chronic exposure above the MCL causes selenosis — characterized by hair and nail loss, peripheral neuropathy, fatigue, and gastrointestinal disturbance. Liver damage can occur with prolonged high intake. The margin between nutritional requirement and toxic dose is narrow, making the MCL an important threshold.

Systems with a Selenium violation

Unresolved first, then largest first
SystemServesStatusRules violated, 3 yrUnresolved
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 Selenium, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Selenium 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. Retrieved from ECHO on Oct 11, 2026.