Mercury violations in Iowa
8 active public water systems in Iowa had a Mercury violation in the past three years. What Mercury is and why it matters.
Systems with a Mercury violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
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 Mercury, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Mercury 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.