EPA Zone Data 2026
Iowa Radon Map, Levels & Testing Guide
View EPA radon zone classifications for every county in Iowa. Open your county to compare basement test meaning, EPA action thresholds, and when mitigation pricing becomes worth checking.
99
Zone 1
High Risk
High Risk
0
Zone 2
Moderate
Moderate
0
Zone 3
Low Risk
Low Risk
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Browse Counties
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Open your county to see its EPA zone, testing meaning, and the point where mitigation becomes worth pricing.
Adair County
Zone 1
Adams County
Zone 1
Allamakee County
Zone 1
Appanoose County
Zone 1
Audubon County
Zone 1
Benton County
Zone 1
Black Hawk County
Zone 1
Boone County
Zone 1
Bremer County
Zone 1
Buchanan County
Zone 1
Buena Vista County
Zone 1
Butler County
Zone 1
Calhoun County
Zone 1
Carroll County
Zone 1
Cass County
Zone 1
Cedar County
Zone 1
Cerro Gordo County
Zone 1
Cherokee County
Zone 1
Chickasaw County
Zone 1
Clarke County
Zone 1
Clay County
Zone 1
Clayton County
Zone 1
Clinton County
Zone 1
Crawford County
Zone 1
Dallas County
Zone 1
Davis County
Zone 1
Decatur County
Zone 1
Delaware County
Zone 1
Des Moines County
Zone 1
Dickinson County
Zone 1
Dubuque County
Zone 1
Emmet County
Zone 1
Fayette County
Zone 1
Floyd County
Zone 1
Franklin County
Zone 1
Fremont County
Zone 1
Greene County
Zone 1
Grundy County
Zone 1
Guthrie County
Zone 1
Hamilton County
Zone 1
Hancock County
Zone 1
Hardin County
Zone 1
Harrison County
Zone 1
Henry County
Zone 1
Howard County
Zone 1
Humboldt County
Zone 1
Ida County
Zone 1
Iowa County
Zone 1
Jackson County
Zone 1
Jasper County
Zone 1
Jefferson County
Zone 1
Johnson County
Zone 1
Jones County
Zone 1
Keokuk County
Zone 1
Kossuth County
Zone 1
Lee County
Zone 1
Linn County
Zone 1
Louisa County
Zone 1
Lucas County
Zone 1
Lyon County
Zone 1
Madison County
Zone 1
Mahaska County
Zone 1
Marion County
Zone 1
Marshall County
Zone 1
Mills County
Zone 1
Mitchell County
Zone 1
Monona County
Zone 1
Monroe County
Zone 1
Montgomery County
Zone 1
Muscatine County
Zone 1
O'Brien County
Zone 1
Osceola County
Zone 1
Page County
Zone 1
Palo Alto County
Zone 1
Plymouth County
Zone 1
Pocahontas County
Zone 1
Polk County
Zone 1
Pottawattamie County
Zone 1
Poweshiek County
Zone 1
Ringgold County
Zone 1
Sac County
Zone 1
Scott County
Zone 1
Shelby County
Zone 1
Sioux County
Zone 1
Story County
Zone 1
Tama County
Zone 1
Taylor County
Zone 1
Union County
Zone 1
Van Buren County
Zone 1
Wapello County
Zone 1
Warren County
Zone 1
Washington County
Zone 1
Wayne County
Zone 1
Webster County
Zone 1
Winnebago County
Zone 1
Winneshiek County
Zone 1
Woodbury County
Zone 1
Worth County
Zone 1
Wright County
Zone 1
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