Iowa County Water Quality Reports

Adair County, IA: High Radon Risk — 53/100 (2026)

2026 report: Adair County, IA scores 53/100 (Grade D). 8 ZIP codes analyzed. No EPA violations. Free report with contaminant data and filter picks.

Adams County, IA: 1 Violation — 50/100 (2026)

2026 report: Adams County, IA scores 50/100 (Grade D). 3 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Allamakee County, IA: 5 Violations — 61/100 (2026)

2026 report: Allamakee County, IA scores 61/100 (Grade C). 6 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter pi...

Appanoose County, IA: 1 Violation — 54/100 (2026)

2026 report: Appanoose County, IA scores 54/100 (Grade D). 8 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Audubon County, IA: 8 Violations — 56/100 (2026)

2026 report: Audubon County, IA scores 56/100 (Grade C). 5 ZIP codes analyzed. 8 EPA violations found. Free report with contaminant data and filter picks.

Benton County, IA: 10 Health Violations — 58/100 (2026)

2026 report: Benton County, IA scores 58/100 (Grade C). 16 ZIP codes analyzed. 52 EPA violations found. Free report with contaminant data and filter picks.

Black Hawk County, IA: 12 Violations — 60/100 (2026)

2026 report: Black Hawk County, IA scores 60/100 (Grade C). 15 ZIP codes analyzed. 12 EPA violations found. Free report with contaminant data and filter...

Boone County, IA: 5 Health Violations — 63/100 (2026)

2026 report: Boone County, IA scores 63/100 (Grade C). 8 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter picks.

Bremer County, IA: 6 Violations — 61/100 (2026)

2026 report: Bremer County, IA scores 61/100 (Grade C). 7 ZIP codes analyzed. 6 EPA violations found. Free report with contaminant data and filter picks.

Buchanan County, IA: 7 Violations — 51/100 (2026)

2026 report: Buchanan County, IA scores 51/100 (Grade D). 10 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter pi...

Buena Vista County, IA: 12 Violations — 63/100 (2026)

2026 report: Buena Vista County, IA scores 63/100 (Grade C). 10 ZIP codes analyzed. 12 EPA violations found. Free report with contaminant data and filte...

Butler County, IA: 3 Health Violations — 56/100 (2026)

2026 report: Butler County, IA scores 56/100 (Grade C). 12 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter picks.

Calhoun County, IA: 6 Health Violations — 60/100 (2026)

2026 report: Calhoun County, IA scores 60/100 (Grade C). 10 ZIP codes analyzed. 17 EPA violations found. Free report with contaminant data and filter pi...

Carroll County, IA: 7 Health Violations — 60/100 (2026)

2026 report: Carroll County, IA scores 60/100 (Grade C). 15 ZIP codes analyzed. 33 EPA violations found. Free report with contaminant data and filter pi...

Cass County, IA: 3 Health Violations — 58/100 (2026)

2026 report: Cass County, IA scores 58/100 (Grade C). 9 ZIP codes analyzed. 24 EPA violations found. Free report with contaminant data and filter picks.

Cedar County, IA: 12 Violations — 61/100 (2026)

2026 report: Cedar County, IA scores 61/100 (Grade C). 8 ZIP codes analyzed. 12 EPA violations found. Free report with contaminant data and filter picks.

Cerro Gordo County, IA: 10 Violations — 62/100 (2026)

2026 report: Cerro Gordo County, IA scores 62/100 (Grade C). 10 ZIP codes analyzed. 10 EPA violations found. Free report with contaminant data and filte...

Cherokee County, IA: 1 Violation — 65/100 (2026)

2026 report: Cherokee County, IA scores 65/100 (Grade C). 8 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Chickasaw County, IA: 1 Health Violation — 58/100 (2026)

2026 report: Chickasaw County, IA scores 58/100 (Grade C). 8 ZIP codes analyzed. 9 EPA violations found. Free report with contaminant data and filter pi...

Clarke County, IA: 3 Health Violations — 48/100 (2026)

2026 report: Clarke County, IA scores 48/100 (Grade D). 5 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Clay County, IA: 1 Violation — 55/100 (2026)

2026 report: Clay County, IA scores 55/100 (Grade C). 7 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Clayton County, IA: 4 Violations — 60/100 (2026)

2026 report: Clayton County, IA scores 60/100 (Grade C). 19 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Clinton County, IA: 10 Violations — 62/100 (2026)

2026 report: Clinton County, IA scores 62/100 (Grade C). 18 ZIP codes analyzed. 10 EPA violations found. Free report with contaminant data and filter pi...

Crawford County, IA: 7 Violations — 63/100 (2026)

2026 report: Crawford County, IA scores 63/100 (Grade C). 10 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter pi...

Dallas County, IA: 1 Health Violation — 60/100 (2026)

2026 report: Dallas County, IA scores 60/100 (Grade C). 15 ZIP codes analyzed. 33 EPA violations found. Free report with contaminant data and filter picks.

Davis County, IA: 1 Violation — 57/100 (2026)

2026 report: Davis County, IA scores 57/100 (Grade C). 4 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Decatur County, IA: 7 Health Violations — 50/100 (2026)

2026 report: Decatur County, IA scores 50/100 (Grade D). 7 ZIP codes analyzed. 15 EPA violations found. Free report with contaminant data and filter picks.

Delaware County, IA: 4 Violations — 65/100 (2026)

2026 report: Delaware County, IA scores 65/100 (Grade C). 6 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Des Moines County, IA: 1 Health Violation — 59/100 (2026)

2026 report: Des Moines County, IA scores 59/100 (Grade C). 6 ZIP codes analyzed. 10 EPA violations found. Free report with contaminant data and filter ...

Dickinson County, IA: 1 Health Violation — 67/100 (2026)

2026 report: Dickinson County, IA scores 67/100 (Grade C). 7 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter pi...

Dubuque County, IA: 21 Violations — 58/100 (2026)

2026 report: Dubuque County, IA scores 58/100 (Grade C). 18 ZIP codes analyzed. 21 EPA violations found. Free report with contaminant data and filter pi...

Emmet County, IA: 5 Violations — 62/100 (2026)

2026 report: Emmet County, IA scores 62/100 (Grade C). 6 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter picks.

Fayette County, IA: 1 Violation — 64/100 (2026)

2026 report: Fayette County, IA scores 64/100 (Grade C). 12 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Floyd County, IA: 2 Violations — 61/100 (2026)

2026 report: Floyd County, IA scores 61/100 (Grade C). 7 ZIP codes analyzed. 2 EPA violations found. Free report with contaminant data and filter picks.

Franklin County, IA: 2 Violations — 59/100 (2026)

2026 report: Franklin County, IA scores 59/100 (Grade C). 8 ZIP codes analyzed. 2 EPA violations found. Free report with contaminant data and filter picks.

Fremont County, IA: 11 Violations — 60/100 (2026)

2026 report: Fremont County, IA scores 60/100 (Grade C). 9 ZIP codes analyzed. 11 EPA violations found. Free report with contaminant data and filter picks.

Greene County, IA: Lead Above EPA Limits — 50/100 (2026)

2026 report: Greene County, IA scores 50/100 (Grade D). 7 ZIP codes analyzed. 7 EPA violations found. Lead above EPA limits. Free report with contaminan...

Grundy County, IA: 1 Violation — 58/100 (2026)

2026 report: Grundy County, IA scores 58/100 (Grade C). 10 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Guthrie County, IA: Lead Above EPA Limits — 57/100 (2026)

2026 report: Guthrie County, IA scores 57/100 (Grade C). 9 ZIP codes analyzed. 27 EPA violations found. Lead above EPA limits. Free report with contamin...

Hamilton County, IA: 11 Violations — 57/100 (2026)

2026 report: Hamilton County, IA scores 57/100 (Grade C). 9 ZIP codes analyzed. 11 EPA violations found. Free report with contaminant data and filter pi...

Hancock County, IA: 1 Health Violation — 64/100 (2026)

2026 report: Hancock County, IA scores 64/100 (Grade C). 8 ZIP codes analyzed. 11 EPA violations found. Free report with contaminant data and filter picks.

Hardin County, IA: 17 Violations — 58/100 (2026)

2026 report: Hardin County, IA scores 58/100 (Grade C). 13 ZIP codes analyzed. 17 EPA violations found. Free report with contaminant data and filter picks.

Harrison County, IA: 35 Violations — 63/100 (2026)

2026 report: Harrison County, IA scores 63/100 (Grade C). 10 ZIP codes analyzed. 35 EPA violations found. Free report with contaminant data and filter p...

Henry County, IA: Lead Above EPA Limits — 55/100 (2026)

2026 report: Henry County, IA scores 55/100 (Grade C). 12 ZIP codes analyzed. 5 EPA violations found. Lead above EPA limits. Free report with contaminan...

Howard County, IA: 8 Violations — 62/100 (2026)

2026 report: Howard County, IA scores 62/100 (Grade C). 6 ZIP codes analyzed. 8 EPA violations found. Free report with contaminant data and filter picks.

Humboldt County, IA: 1 Health Violation — 59/100 (2026)

2026 report: Humboldt County, IA scores 59/100 (Grade C). 10 ZIP codes analyzed. 10 EPA violations found. Free report with contaminant data and filter p...

Ida County, IA: 2 Violations — 65/100 (2026)

2026 report: Ida County, IA scores 65/100 (Grade C). 5 ZIP codes analyzed. 2 EPA violations found. Free report with contaminant data and filter picks.

Iowa County, IA: Lead Above EPA Limits — 54/100 (2026)

2026 report: Iowa County, IA scores 54/100 (Grade D). 13 ZIP codes analyzed. 39 EPA violations found. Lead above EPA limits. Free report with contaminan...

Jackson County, IA: 11 Violations — 63/100 (2026)

2026 report: Jackson County, IA scores 63/100 (Grade C). 12 ZIP codes analyzed. 11 EPA violations found. Free report with contaminant data and filter pi...

Jasper County, IA: 1 Health Violation — 59/100 (2026)

2026 report: Jasper County, IA scores 59/100 (Grade C). 14 ZIP codes analyzed. 19 EPA violations found. Free report with contaminant data and filter picks.

Jefferson County, IA: 25 Violations — 60/100 (2026)

2026 report: Jefferson County, IA scores 60/100 (Grade C). 6 ZIP codes analyzed. 25 EPA violations found. Free report with contaminant data and filter p...

Johnson County, IA: 4 Health Violations — 56/100 (2026)

2026 report: Johnson County, IA scores 56/100 (Grade C). 13 ZIP codes analyzed. 130 EPA violations found. Free report with contaminant data and filter p...

Jones County, IA: 2 Health Violations — 63/100 (2026)

2026 report: Jones County, IA scores 63/100 (Grade C). 10 ZIP codes analyzed. 138 EPA violations found. Free report with contaminant data and filter picks.

Keokuk County, IA: 5 Violations — 55/100 (2026)

2026 report: Keokuk County, IA scores 55/100 (Grade C). 17 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter picks.

Kossuth County, IA: 12 Violations — 60/100 (2026)

2026 report: Kossuth County, IA scores 60/100 (Grade C). 12 ZIP codes analyzed. 12 EPA violations found. Free report with contaminant data and filter pi...

Lee County, IA: 5 Violations — 53/100 (2026)

2026 report: Lee County, IA scores 53/100 (Grade D). 10 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter picks.

Linn County, IA: 30 Health Violations — 61/100 (2026)

2026 report: Linn County, IA scores 61/100 (Grade C). 33 ZIP codes analyzed. 1171 EPA violations found. Free report with contaminant data and filter picks.

Louisa County, IA: 14 Violations — 60/100 (2026)

2026 report: Louisa County, IA scores 60/100 (Grade C). 10 ZIP codes analyzed. 14 EPA violations found. Free report with contaminant data and filter picks.

Lucas County, IA: 4 Violations — 56/100 (2026)

2026 report: Lucas County, IA scores 56/100 (Grade C). 5 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Lyon County, IA: 3 Violations — 65/100 (2026)

2026 report: Lyon County, IA scores 65/100 (Grade C). 8 ZIP codes analyzed. 3 EPA violations found. Free report with contaminant data and filter picks.

Madison County, IA: 4 Violations — 61/100 (2026)

2026 report: Madison County, IA scores 61/100 (Grade C). 4 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Mahaska County, IA: 7 Violations — 52/100 (2026)

2026 report: Mahaska County, IA scores 52/100 (Grade D). 7 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter picks.

Marion County, IA: 6 Violations — 58/100 (2026)

2026 report: Marion County, IA scores 58/100 (Grade C). 13 ZIP codes analyzed. 6 EPA violations found. Free report with contaminant data and filter picks.

Marshall County, IA: 6 Health Violations — 57/100 (2026)

2026 report: Marshall County, IA scores 57/100 (Grade C). 13 ZIP codes analyzed. 30 EPA violations found. Free report with contaminant data and filter p...

Mills County, IA: 7 Health Violations — 58/100 (2026)

2026 report: Mills County, IA scores 58/100 (Grade C). 7 ZIP codes analyzed. 21 EPA violations found. Free report with contaminant data and filter picks.

Mitchell County, IA: 4 Violations — 56/100 (2026)

2026 report: Mitchell County, IA scores 56/100 (Grade C). 8 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Monona County, IA: 10 Violations — 65/100 (2026)

2026 report: Monona County, IA scores 65/100 (Grade C). 9 ZIP codes analyzed. 10 EPA violations found. Free report with contaminant data and filter picks.

Monroe County, IA: High Radon Risk — 62/100 (2026)

2026 report: Monroe County, IA scores 62/100 (Grade C). 2 ZIP codes analyzed. No EPA violations. Free report with contaminant data and filter picks.

Montgomery County, IA: 7 Violations — 52/100 (2026)

2026 report: Montgomery County, IA scores 52/100 (Grade D). 7 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter p...

Muscatine County, IA: 1 Health Violation — 60/100 (2026)

2026 report: Muscatine County, IA scores 60/100 (Grade C). 8 ZIP codes analyzed. 10 EPA violations found. Free report with contaminant data and filter p...

O'Brien County, IA: 6 Violations — 63/100 (2026)

2026 report: O'Brien County, IA scores 63/100 (Grade C). 8 ZIP codes analyzed. 6 EPA violations found. Free report with contaminant data and filter picks.

Osceola County, IA: 4 Violations — 67/100 (2026)

2026 report: Osceola County, IA scores 67/100 (Grade C). 5 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Page County, IA: 1 Health Violation — 58/100 (2026)

2026 report: Page County, IA scores 58/100 (Grade C). 12 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Palo Alto County, IA: 10 Health Violations — 56/100 (2026)

2026 report: Palo Alto County, IA scores 56/100 (Grade C). 8 ZIP codes analyzed. 14 EPA violations found. Free report with contaminant data and filter p...

Plymouth County, IA: 9 Violations — 64/100 (2026)

2026 report: Plymouth County, IA scores 64/100 (Grade C). 9 ZIP codes analyzed. 9 EPA violations found. Free report with contaminant data and filter picks.

Pocahontas County, IA: 9 Violations — 63/100 (2026)

2026 report: Pocahontas County, IA scores 63/100 (Grade C). 8 ZIP codes analyzed. 9 EPA violations found. Free report with contaminant data and filter p...

Polk County, IA: 1 Health Violation — 61/100 (2026)

2026 report: Polk County, IA scores 61/100 (Grade C). 79 ZIP codes analyzed. 382 EPA violations found. Free report with contaminant data and filter picks.

Pottawattamie County, IA: 34 Violations — 60/100 (2026)

2026 report: Pottawattamie County, IA scores 60/100 (Grade C). 18 ZIP codes analyzed. 34 EPA violations found. Free report with contaminant data and fil...

Poweshiek County, IA: 6 Health Violations — 51/100 (2026)

2026 report: Poweshiek County, IA scores 51/100 (Grade D). 8 ZIP codes analyzed. 24 EPA violations found. Free report with contaminant data and filter p...

Ringgold County, IA: 17 Violations — 43/100 (2026)

2026 report: Ringgold County, IA scores 43/100 (Grade D). 10 ZIP codes analyzed. 17 EPA violations found. Free report with contaminant data and filter p...

Sac County, IA: 6 Health Violations — 63/100 (2026)

2026 report: Sac County, IA scores 63/100 (Grade C). 9 ZIP codes analyzed. 9 EPA violations found. Free report with contaminant data and filter picks.

Scott County, IA: 1 Health Violation — 56/100 (2026)

2026 report: Scott County, IA scores 56/100 (Grade C). 22 ZIP codes analyzed. 119 EPA violations found. Free report with contaminant data and filter picks.

Shelby County, IA: 25 Violations — 57/100 (2026)

2026 report: Shelby County, IA scores 57/100 (Grade C). 11 ZIP codes analyzed. 25 EPA violations found. Free report with contaminant data and filter picks.

Sioux County, IA: 4 Violations — 67/100 (2026)

2026 report: Sioux County, IA scores 67/100 (Grade C). 12 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Story County, IA: 1 Health Violation — 64/100 (2026)

2026 report: Story County, IA scores 64/100 (Grade C). 18 ZIP codes analyzed. 21 EPA violations found. Free report with contaminant data and filter picks.

Tama County, IA: 14 Violations — 58/100 (2026)

2026 report: Tama County, IA scores 58/100 (Grade C). 11 ZIP codes analyzed. 14 EPA violations found. Free report with contaminant data and filter picks.

Taylor County, IA: High Radon Risk — 51/100 (2026)

2026 report: Taylor County, IA scores 51/100 (Grade D). 7 ZIP codes analyzed. No EPA violations. Free report with contaminant data and filter picks.

Union County, IA: High Radon Risk — 65/100 (2026)

2026 report: Union County, IA scores 65/100 (Grade C). 1 ZIP code analyzed. No EPA violations. Free report with contaminant data and filter picks.

Van Buren County, IA: 5 Violations — 57/100 (2026)

2026 report: Van Buren County, IA scores 57/100 (Grade C). 9 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter pi...

Wapello County, IA: 7 Violations — 55/100 (2026)

2026 report: Wapello County, IA scores 55/100 (Grade C). 7 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter picks.

Warren County, IA: 6 Violations — 59/100 (2026)

2026 report: Warren County, IA scores 59/100 (Grade C). 15 ZIP codes analyzed. 6 EPA violations found. Free report with contaminant data and filter picks.

Washington County, IA: 5 Violations — 65/100 (2026)

2026 report: Washington County, IA scores 65/100 (Grade C). 7 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter p...

Wayne County, IA: 8 Violations — 52/100 (2026)

2026 report: Wayne County, IA scores 52/100 (Grade D). 9 ZIP codes analyzed. 8 EPA violations found. Free report with contaminant data and filter picks.

Webster County, IA: 20 Health Violations — 56/100 (2026)

2026 report: Webster County, IA scores 56/100 (Grade C). 15 ZIP codes analyzed. 34 EPA violations found. Free report with contaminant data and filter pi...

Winnebago County, IA: 1 Health Violation — 63/100 (2026)

2026 report: Winnebago County, IA scores 63/100 (Grade C). 7 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter pi...

Winneshiek County, IA: 4 Violations — 59/100 (2026)

2026 report: Winneshiek County, IA scores 59/100 (Grade C). 9 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter p...

Woodbury County, IA: 1 Health Violation — 64/100 (2026)

2026 report: Woodbury County, IA scores 64/100 (Grade C). 25 ZIP codes analyzed. 15 EPA violations found. Free report with contaminant data and filter p...

Worth County, IA: 18 Violations — 65/100 (2026)

2026 report: Worth County, IA scores 65/100 (Grade C). 7 ZIP codes analyzed. 18 EPA violations found. Free report with contaminant data and filter picks.

Wright County, IA: 7 Violations — 61/100 (2026)

2026 report: Wright County, IA scores 61/100 (Grade C). 10 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter picks.