Tapcensus

Selenium violations in Iowa

8 active public water systems in Iowa 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

Latest quarter first, then largest first
SystemServesStatusRules violated, 3 yrUnresolved
Camanche Water Supply
Camanche · Clinton County 		4,570 2 0
Turkey Valley Community School
Jackson Junction · Winneshiek County 		490 2 0
Marshalltown Estates
Marshalltown · Marshall County 		382 3 0
Iowa City Regency Mobile Home Community
Iowa City · Johnson County 		225 2 0
Monmouth Water Supply
Monmouth · Jackson County 		129 2 0
US Nameplate Company INC
Mount Vernon · Linn County 		65 8 1
Rocky Knoll MHP
Forest City · Winnebago County 		49 3 0
Redwing Estates HOA
Iowa City · Johnson County 		48 3 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 Iowa 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.