EPA radon zones
South Dakota radon map: every county's zone
48 of South Dakota's 66 counties are EPA radon zone 1 (predicted average above 4 pCi/L), 18 are zone 2 and 0 are zone 3. High readings occur in every zone, so EPA recommends testing every home.
Aurora CountyZone 1
Beadle CountyZone 1
Bennett CountyZone 2
Bon Homme CountyZone 1
Brookings CountyZone 1
Brown CountyZone 1
Brule CountyZone 1
Buffalo CountyZone 1
Butte CountyZone 2
Campbell CountyZone 1
Charles Mix CountyZone 1
Clark CountyZone 1
Clay CountyZone 1
Codington CountyZone 1
Corson CountyZone 1
Custer CountyZone 2
Davison CountyZone 1
Day CountyZone 1
Deuel CountyZone 1
Dewey CountyZone 2
Douglas CountyZone 1
Edmunds CountyZone 1
Fall River CountyZone 2
Faulk CountyZone 1
Grant CountyZone 1
Gregory CountyZone 2
Haakon CountyZone 2
Hamlin CountyZone 1
Hand CountyZone 1
Hanson CountyZone 1
Harding CountyZone 2
Hughes CountyZone 1
Hutchinson CountyZone 1
Hyde CountyZone 1
Jackson CountyZone 2
Jerauld CountyZone 1
Jones CountyZone 2
Kingsbury CountyZone 1
Lake CountyZone 1
Lawrence CountyZone 2
Lincoln CountyZone 1
Lyman CountyZone 1
Marshall CountyZone 1
McCook CountyZone 1
McPherson CountyZone 1
Meade CountyZone 2
Mellette CountyZone 2
Miner CountyZone 1
Minnehaha CountyZone 1
Moody CountyZone 1
Pennington CountyZone 2
Perkins CountyZone 1
Potter CountyZone 1
Roberts CountyZone 1
Sanborn CountyZone 1
Shannon CountyZone 2
Spink CountyZone 1
Stanley CountyZone 1
Sully CountyZone 1
Todd CountyZone 2
Tripp CountyZone 2
Turner CountyZone 1
Union CountyZone 1
Walworth CountyZone 1
Yankton CountyZone 1
Ziebach CountyZone 2
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.
South Dakota cities: water and radon
Source: EPA Map of Radon Zones.