EPA radon zones
Indiana radon map: every county's zone
57 of Indiana's 92 counties are EPA radon zone 1 (predicted average above 4 pCi/L), 35 are zone 2 and 0 are zone 3. High readings occur in every zone, so EPA recommends testing every home.
Adams CountyZone 1
Allen CountyZone 1
Bartholomew CountyZone 1
Benton CountyZone 1
Blackford CountyZone 1
Boone CountyZone 1
Brown CountyZone 2
Carroll CountyZone 1
Cass CountyZone 1
Clark CountyZone 1
Clay CountyZone 2
Clinton CountyZone 1
Crawford CountyZone 2
Daviess CountyZone 2
Dearborn CountyZone 2
Decatur CountyZone 1
DeKalb CountyZone 1
Delaware CountyZone 1
Dubois CountyZone 2
Elkhart CountyZone 1
Fayette CountyZone 1
Floyd CountyZone 2
Fountain CountyZone 1
Franklin CountyZone 2
Fulton CountyZone 1
Gibson CountyZone 2
Grant CountyZone 1
Greene CountyZone 2
Hamilton CountyZone 1
Hancock CountyZone 1
Harrison CountyZone 1
Hendricks CountyZone 1
Henry CountyZone 1
Howard CountyZone 1
Huntington CountyZone 1
Jackson CountyZone 2
Jasper CountyZone 2
Jay CountyZone 1
Jefferson CountyZone 2
Jennings CountyZone 1
Johnson CountyZone 1
Knox CountyZone 2
Kosciusko CountyZone 1
LaGrange CountyZone 1
Lake CountyZone 2
LaPorte CountyZone 2
Lawrence CountyZone 1
Madison CountyZone 1
Marion CountyZone 1
Marshall CountyZone 1
Martin CountyZone 2
Miami CountyZone 1
Monroe CountyZone 1
Montgomery CountyZone 1
Morgan CountyZone 2
Newton CountyZone 2
Noble CountyZone 1
Ohio CountyZone 2
Orange CountyZone 1
Owen CountyZone 2
Parke CountyZone 2
Perry CountyZone 2
Pike CountyZone 2
Porter CountyZone 2
Posey CountyZone 2
Pulaski CountyZone 2
Putnam CountyZone 1
Randolph CountyZone 1
Ripley CountyZone 2
Rush CountyZone 1
Scott CountyZone 1
Shelby CountyZone 1
Spencer CountyZone 2
St. Joseph CountyZone 1
Starke CountyZone 2
Steuben CountyZone 1
Sullivan CountyZone 2
Switzerland CountyZone 2
Tippecanoe CountyZone 1
Tipton CountyZone 1
Union CountyZone 1
Vanderburgh CountyZone 2
Vermillion CountyZone 1
Vigo CountyZone 2
Wabash CountyZone 1
Warren CountyZone 1
Warrick CountyZone 2
Washington CountyZone 1
Wayne CountyZone 1
Wells CountyZone 1
White CountyZone 1
Whitley 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.
Indiana cities: water and radon
Source: EPA Map of Radon Zones.