Nitrate violations in Iowa
190 active public water systems in Iowa had a Nitrate violation in the past three years, 34 of them in the latest quarter of EPA's data. What Nitrate is and why it matters.
Health effects: Methemoglobinemia in infants under 6 months: gut bacteria convert nitrate to nitrite, which blocks oxygen transport in blood. Pregnant women should also take precautions. Chronic adult exposure at elevated levels may increase cancer risk.
Systems with a Nitrate violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Dows Water Supply Dows · Wright County |
526 | 1 | 0 | |
|
Albion Water Department Albion · Marshall County |
448 | 2 | 0 | |
|
Emerson Water Department Emerson · Mills County |
412 | 1 | 0 | |
|
Ringsted Water Supply Ringsted · Emmet County |
365 | 1 | 0 | |
|
Ute Water Supply Ute · Monona County |
338 | 4 | 0 | |
|
Steamboat Rock Water Dept Steamboat Rock · Hardin County |
264 | 5 | 0 | |
|
Coulter Water Supply Coulter · Franklin County |
219 | 3 | 0 | |
|
Bristow Muni Water Supply Bristow · Butler County |
145 | 1 | 0 | |
|
Dawson Water Works Dawson · Dallas County |
116 | 6 | 0 | |
|
Iowa Falls Evangelical Free Church Iowa Falls · Hardin County |
102 | 1 | 0 | |
|
Lewis and Clark Monument Council Bluffs · Pottawattamie County |
102 | 2 | 1 | |
|
Hampton Country Club Hampton · Franklin County |
82 | 2 | 0 | |
|
Humboldt Country Club Humboldt · Humboldt County |
82 | 2 | 0 | |
|
Fox Lake RV Park LLC Hamburg · Fremont County |
75 | 1 | 0 | |
|
RJ Thomas Manufacturing CO INC Cherokee · Cherokee County |
75 | 1 | 0 | |
|
Valley Heights 1st Annex Blue Grass · Scott County |
70 | 2 | 0 | |
|
Pine Ridge Park Steamboat Rock · Hardin County |
62 | 2 | 0 | |
|
Pine Creek Golf Course Mason City · Cerro Gordo County |
55 | 2 | 0 | |
|
Wayne Zion Lutheran Church Monticello · Jones County |
52 | 2 | 1 | |
|
Cliffs Place INC Plainfield · Bremer County |
51 | 3 | 1 | |
|
Eagle Grove Country Club Eagle Grove · Wright County |
51 | 1 | 0 | |
|
Hwh Corporation (west) Tipton · Cedar County |
50 | 2 | 0 | |
|
Lost Beach Resort Delhi · Delaware County |
50 | 1 | 0 | |
|
Mason City Red Power INC Mason City · Cerro Gordo County |
38 | 1 | 0 | |
|
Alfred's Bar and Grill Bernard · Jackson County |
35 | 4 | 1 | |
|
Clarmond Country Club Belmond · Wright County |
35 | 3 | 1 | |
|
Kauths Oak Valley HOA 2nd Addition Buffalo · Scott County |
31 | 1 | 0 | |
|
Bodensteiner Implement of Rowley Rowley · Buchanan County |
30 | 1 | 0 | |
|
Super 8 Williams Williams · Hamilton County |
28 | 2 | 0 | |
|
Aunt Dharma's Sandbar on the Wapsi LLC Troy Mills · Linn County |
27 | 3 | 1 | |
|
Christensen Farms Midwest LLC Forest City · Winnebago County |
25 | 1 | 0 | |
|
Lazy T Campground Manchester · Delaware County |
25 | 2 | 0 | |
|
Parkers Pit Stop Bellevue · Jackson County |
25 | 3 | 0 | |
|
The Balk Tank Lawler · Chickasaw County |
25 | 2 | 0 | |
|
Ottumwa Water Works Ottumwa · Wapello County |
25,529 | 2 | 0 | |
|
Red Oak Water Supply Red Oak · Montgomery County |
5,596 | 2 | 0 | |
|
Carlisle Water Supply Carlisle · Warren County |
4,170 | 2 | 1 | |
|
Rural Water System #1 Hospers · Sioux County |
3,428 | 1 | 0 | |
|
Story City Water Dept Story City · Story County |
3,357 | 1 | 0 | |
|
Lamoni Municipal Utilities Lamoni · Decatur County |
2,029 | 5 | 0 | |
|
Corning Muni Water Department Corning · Adams County |
1,735 | 1 | 0 | |
|
Ackley Municipal Water Works Ackley · Hardin County |
1,599 | 1 | 0 | |
|
Walcott Waterworks Walcott · Scott County |
1,551 | 1 | 0 | |
|
Clarinda Treatment Complex Clarinda · Page County |
1,439 | 2 | 0 | |
|
Logan Water Supply Logan · Harrison County |
1,397 | 1 | 0 | |
|
Jewell Water Supply Jewell · Hamilton County |
1,216 | 1 | 0 | |
|
Camp Dodge Water Supply Johnston · Polk County |
1,169 | 4 | 0 | |
|
Panora Water Works Panora · Guthrie County |
1,142 | 3 | 0 | |
|
Lake View Water Supply Lake View · Sac County |
1,133 | 2 | 0 | |
|
Treynor Water Department Treynor · Pottawattamie County |
1,049 | 1 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Nitrate, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Nitrate 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.