EPA Zone Data 2026
Indiana Radon Map, Levels & Testing Guide
View EPA radon zone classifications for every county in Indiana. Open your county to compare basement test meaning, EPA action thresholds, and when mitigation pricing becomes worth checking.
57
Zone 1
High Risk
High Risk
35
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.
Adams County
Zone 1
Allen County
Zone 1
Bartholomew County
Zone 1
Benton County
Zone 1
Blackford County
Zone 1
Boone County
Zone 1
Brown County
Zone 2
Carroll County
Zone 1
Cass County
Zone 1
Clark County
Zone 1
Clay County
Zone 2
Clinton County
Zone 1
Crawford County
Zone 2
Daviess County
Zone 2
DeKalb County
Zone 1
Dearborn County
Zone 2
Decatur County
Zone 1
Delaware County
Zone 1
Dubois County
Zone 2
Elkhart County
Zone 1
Fayette County
Zone 1
Floyd County
Zone 2
Fountain County
Zone 1
Franklin County
Zone 2
Fulton County
Zone 1
Gibson County
Zone 2
Grant County
Zone 1
Greene County
Zone 2
Hamilton County
Zone 1
Hancock County
Zone 1
Harrison County
Zone 1
Hendricks County
Zone 1
Henry County
Zone 1
Howard County
Zone 1
Huntington County
Zone 1
Jackson County
Zone 2
Jasper County
Zone 2
Jay County
Zone 1
Jefferson County
Zone 2
Jennings County
Zone 1
Johnson County
Zone 1
Knox County
Zone 2
Kosciusko County
Zone 1
LaGrange County
Zone 1
LaPorte County
Zone 2
Lake County
Zone 2
Lawrence County
Zone 1
Madison County
Zone 1
Marion County
Zone 1
Marshall County
Zone 1
Martin County
Zone 2
Miami County
Zone 1
Monroe County
Zone 1
Montgomery County
Zone 1
Morgan County
Zone 2
Newton County
Zone 2
Noble County
Zone 1
Ohio County
Zone 2
Orange County
Zone 1
Owen County
Zone 2
Parke County
Zone 2
Perry County
Zone 2
Pike County
Zone 2
Porter County
Zone 2
Posey County
Zone 2
Pulaski County
Zone 2
Putnam County
Zone 1
Randolph County
Zone 1
Ripley County
Zone 2
Rush County
Zone 1
Scott County
Zone 1
Shelby County
Zone 1
Spencer County
Zone 2
St. Joseph County
Zone 1
Starke County
Zone 2
Steuben County
Zone 1
Sullivan County
Zone 2
Switzerland County
Zone 2
Tippecanoe County
Zone 1
Tipton County
Zone 1
Union County
Zone 1
Vanderburgh County
Zone 2
Vermillion County
Zone 1
Vigo County
Zone 2
Wabash County
Zone 1
Warren County
Zone 1
Warrick County
Zone 2
Washington County
Zone 1
Wayne County
Zone 1
Wells County
Zone 1
White County
Zone 1
Whitley County
Zone 1
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