EPA radon zones
Iowa radon map: every county's zone
99 of Iowa's 99 counties are EPA radon zone 1 (predicted average above 4 pCi/L), 0 are zone 2 and 0 are zone 3. High readings occur in every zone, so EPA recommends testing every home.
Adair CountyZone 1
Adams CountyZone 1
Allamakee CountyZone 1
Appanoose CountyZone 1
Audubon CountyZone 1
Benton CountyZone 1
Black Hawk CountyZone 1
Boone CountyZone 1
Bremer CountyZone 1
Buchanan CountyZone 1
Buena Vista CountyZone 1
Butler CountyZone 1
Calhoun CountyZone 1
Carroll CountyZone 1
Cass CountyZone 1
Cedar CountyZone 1
Cerro Gordo CountyZone 1
Cherokee CountyZone 1
Chickasaw CountyZone 1
Clarke CountyZone 1
Clay CountyZone 1
Clayton CountyZone 1
Clinton CountyZone 1
Crawford CountyZone 1
Dallas CountyZone 1
Davis CountyZone 1
Decatur CountyZone 1
Delaware CountyZone 1
Des Moines CountyZone 1
Dickinson CountyZone 1
Dubuque CountyZone 1
Emmet CountyZone 1
Fayette CountyZone 1
Floyd CountyZone 1
Franklin CountyZone 1
Fremont CountyZone 1
Greene CountyZone 1
Grundy CountyZone 1
Guthrie CountyZone 1
Hamilton CountyZone 1
Hancock CountyZone 1
Hardin CountyZone 1
Harrison CountyZone 1
Henry CountyZone 1
Howard CountyZone 1
Humboldt CountyZone 1
Ida CountyZone 1
Iowa CountyZone 1
Jackson CountyZone 1
Jasper CountyZone 1
Jefferson CountyZone 1
Johnson CountyZone 1
Jones CountyZone 1
Keokuk CountyZone 1
Kossuth CountyZone 1
Lee CountyZone 1
Linn CountyZone 1
Louisa CountyZone 1
Lucas CountyZone 1
Lyon CountyZone 1
Madison CountyZone 1
Mahaska CountyZone 1
Marion CountyZone 1
Marshall CountyZone 1
Mills CountyZone 1
Mitchell CountyZone 1
Monona CountyZone 1
Monroe CountyZone 1
Montgomery CountyZone 1
Muscatine CountyZone 1
O'Brien CountyZone 1
Osceola CountyZone 1
Page CountyZone 1
Palo Alto CountyZone 1
Plymouth CountyZone 1
Pocahontas CountyZone 1
Polk CountyZone 1
Pottawattamie CountyZone 1
Poweshiek CountyZone 1
Ringgold CountyZone 1
Sac CountyZone 1
Scott CountyZone 1
Shelby CountyZone 1
Sioux CountyZone 1
Story CountyZone 1
Tama CountyZone 1
Taylor CountyZone 1
Union CountyZone 1
Van Buren CountyZone 1
Wapello CountyZone 1
Warren CountyZone 1
Washington CountyZone 1
Wayne CountyZone 1
Webster CountyZone 1
Winnebago CountyZone 1
Winneshiek CountyZone 1
Woodbury CountyZone 1
Worth CountyZone 1
Wright CountyZone 1
How much does radon mitigation cost?
Most single-family systems cost $800 to $2,500 installed, depending on foundation type and how many suction points are needed. A follow-up test confirms the system works.
What do the zones mean?
EPA radon zones describe counties, not houses. Zone 1 counties have a predicted average indoor level above 4 picocuries per liter (pCi/L), Zone 2 between 2 and 4, Zone 3 below 2. Homes with high levels are found in every zone, which is why EPA recommends that every home be tested, and fixed at 4 pCi/L or above.
Iowa cities: water and radon
Source: EPA Map of Radon Zones.