Diquat violations in Iowa
16 active public water systems in Iowa had a Diquat violation in the past three years. What Diquat is and why it matters.
Health effects: Chronic exposure to diquat is associated with cataracts and kidney damage in animal studies. Acute high-level exposure causes gastrointestinal distress. EPA has not classified diquat as a human carcinogen. Individuals with kidney conditions may be at elevated risk from chronic exposure.
Systems with a Diquat violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Maquoketa Municipal Water Maquoketa · Jackson County |
6,128 | 2 | 0 | |
|
Gilbert Water Supply Gilbert · Story County |
1,211 | 2 | 0 | |
|
Camp Dodge Water Supply Johnston · Polk County |
1,169 | 4 | 0 | |
|
Starmont Community School District Strawberry Point · Clayton County |
742 | 4 | 0 | |
|
Hazleton Water Supply Hazleton · Buchanan County |
713 | 4 | 1 | |
|
Plymouth Water Supply Plymouth · Cerro Gordo County |
378 | 5 | 1 | |
|
Steamboat Rock Water Dept Steamboat Rock · Hardin County |
264 | 5 | 0 | |
|
Coralville Lake Manor Solon · Johnson County |
170 | 2 | 0 | |
|
Lake Woods HOA Shueyville · Johnson County |
114 | 3 | 0 | |
|
Valley View Estates #1 and #2 Muscatine · Muscatine County |
89 | 2 | 0 | |
|
New Cooperative, INC (roelyn) Moorland · Webster County |
80 | 4 | 0 | |
|
Timber Valley Estates (third Addition) Blue Grass · Scott County |
73 | 2 | 0 | |
|
Montipark LLC Monticello · Jones County |
60 | 10 | 4 | |
|
Glenn Oaks Addition Toddville · Linn County |
58 | 6 | 2 | |
|
Revelle 1st & 2nd Subdivision Blue Grass · Scott County |
54 | 1 | 0 | |
|
North End Mobile Home Park Dubuque · Dubuque County |
40 | 4 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Diquat, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Diquat 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.