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