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Radon zones in South Dakota

The EPA assigns every county in South Dakota to one of three radon potential zones. 48 are in Zone 1, the highest category, home to about 72% of the state's residents.

66
Counties
48
Zone 1 counties
Predicted average above 4 pCi/L
18
Zone 2 counties
Predicted average 2-4 pCi/L
0
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across South Dakota

Every county in South Dakota, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 48Zone 2 · 18Zone 3 · 0

Hover a county · click to open it

County by county

All 66 South Dakota counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Aurora County12,7827.4%15.4% -
Beadle County120k8.1%16.9%29.9
Bon Homme County17,0658.0%17.7% -
Brookings County136k4.9%10.7%32.7
Brown County138k6.3%14.1%29.6
Brule County15,3118.1%16.4%40.6
Buffalo County11,8849.9%31.7% -
Campbell County11,3408.1%13.7% -
Charles Mix County19,2409.3%20.4% -
Clark County13,9488.4%16.5% -
Clay County115k5.1%12.4%31.9
Codington County129k7.3%16.2%37.9
Corson County13,78212.5%29.6% -
Davison County120k7.5%15.6%28.9
Day County15,4519.0%16.6% -
Deuel County14,3547.3%14.8% -
Douglas County12,8388.5%15.8% -
Edmunds County14,0577.6%14.7% -
Faulk County12,1519.4%17.2% -
Grant County17,5537.7%14.7%26.5
Hamlin County16,4516.1%14.6% -
Hand County13,1077.0%13.0% -
Hanson County13,4717.4%16.8% -
Hughes County118k5.9%13.7%40.1
Hutchinson County17,3947.3%14.6% -
Hyde County11,1868.4%16.3% -
Jerauld County11,6608.1%14.5% -
Kingsbury County15,2767.4%14.7%44.2
Lake County111k6.8%13.2%26.6
Lincoln County173k4.8%11.6%24.9
Lyman County13,7059.5%21.4% -
Marshall County14,3907.3%15.2% -
McCook County15,8096.4%14.0%59.6
McPherson County12,3349.7%16.2% -
Miner County12,2808.2%15.9% -
Minnehaha County1207k5.6%14.2%43.6
Moody County16,4506.7%14.5% -
Perkins County12,8348.9%16.0% -
Potter County12,4137.4%13.6% -
Roberts County110k9.7%20.3%32.1
Sanborn County12,3997.8%16.1% -
Spink County16,1668.0%15.1% -
Stanley County13,0436.3%13.4% -
Sully County11,4947.1%13.7% -
Turner County19,0277.1%15.0%27.8
Union County117k5.9%12.8%30.1
Walworth County15,2697.9%15.7% -
Yankton County124k6.7%13.8%22.6
Bennett County23,30511.5%28.0% -
Butte County211k8.1%16.8%55.1
Custer County29,1177.9%13.9%22.1
Dewey County25,20810.3%29.5% -
Fall River County27,39310.2%17.4%36.6
Gregory County24,0188.8%16.2% -
Haakon County21,8518.5%15.7% -
Harding County21,3246.3%13.3% -
Jackson County22,77612.3%28.5% -
Jones County28558.8%16.2% -
Lawrence County228k7.1%14.2%25.4
Meade County231k6.0%14.1%34.1
Mellette County21,85113.7%30.2% -
Oglala Lakota County213k13.6%39.8%44.0
Pennington County2116k6.8%15.0%32.1
Todd County29,19913.2%37.2%68.7
Tripp County25,62110.0%18.9% -
Ziebach County22,32211.2%30.4% -

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Highest potential

Zone 1 counties in South Dakota

These 48 counties have a predicted average indoor radon screening level above the EPA action level. The EPA recommends every home in them be tested.

Other states

Radon zones elsewhere