Radon levels in South Dakota

Verified county-level radon indicators are available for 62 South Dakota counties. Select a county for its source period and sample details.

High results are most common in Lake County (76%) and least common in Davison County (49%) Share of tests at or above 4 pCi/L by county · Radon test results from laboratories, 2008–2017 · 62 of 66 counties have data
Aurora County: 40% of tests at or above 4 pCi/L · 15 tests Beadle County: 59% of tests at or above 4 pCi/L · 54 tests Bennett County: 33% of tests at or above 4 pCi/L · 3 tests Bon Homme County: 74% of tests at or above 4 pCi/L · 62 tests Brookings County: 69% of tests at or above 4 pCi/L · 356 tests Brown County: 71% of tests at or above 4 pCi/L · 62 tests Brule County: 68% of tests at or above 4 pCi/L · 37 tests Buffalo County: no data Butte County: 58% of tests at or above 4 pCi/L · 24 tests Campbell County: 29% of tests at or above 4 pCi/L · 7 tests Charles Mix County: 61% of tests at or above 4 pCi/L · 28 tests Clark County: 78% of tests at or above 4 pCi/L · 9 tests Clay County: 52% of tests at or above 4 pCi/L · 83 tests Codington County: 65% of tests at or above 4 pCi/L · 77 tests Corson County: no data Custer County: 66% of tests at or above 4 pCi/L · 108 tests Davison County: 49% of tests at or above 4 pCi/L · 84 tests Day County: 55% of tests at or above 4 pCi/L · 11 tests Deuel County: 76% of tests at or above 4 pCi/L · 25 tests Dewey County: 0% of tests at or above 4 pCi/L · 1 tests Douglas County: 0% of tests at or above 4 pCi/L · 3 tests Edmunds County: 67% of tests at or above 4 pCi/L · 12 tests Fall River County: 63% of tests at or above 4 pCi/L · 24 tests Faulk County: 100% of tests at or above 4 pCi/L · 1 tests Grant County: 55% of tests at or above 4 pCi/L · 78 tests Gregory County: 67% of tests at or above 4 pCi/L · 15 tests Haakon County: 80% of tests at or above 4 pCi/L · 5 tests Hamlin County: 77% of tests at or above 4 pCi/L · 13 tests Hand County: 82% of tests at or above 4 pCi/L · 11 tests Hanson County: 25% of tests at or above 4 pCi/L · 8 tests Harding County: 100% of tests at or above 4 pCi/L · 1 tests Hughes County: 70% of tests at or above 4 pCi/L · 71 tests Hutchinson County: 67% of tests at or above 4 pCi/L · 39 tests Hyde County: 57% of tests at or above 4 pCi/L · 7 tests Jackson County: 0% of tests at or above 4 pCi/L · 1 tests Jerauld County: 70% of tests at or above 4 pCi/L · 23 tests Jones County: 75% of tests at or above 4 pCi/L · 8 tests Kingsbury County: 68% of tests at or above 4 pCi/L · 44 tests Lake County: 76% of tests at or above 4 pCi/L · 50 tests Lawrence County: 57% of tests at or above 4 pCi/L · 160 tests Lincoln County: 56% of tests at or above 4 pCi/L · 795 tests Lyman County: 100% of tests at or above 4 pCi/L · 2 tests McCook County: 50% of tests at or above 4 pCi/L · 30 tests McPherson County: 58% of tests at or above 4 pCi/L · 12 tests Marshall County: 81% of tests at or above 4 pCi/L · 16 tests Meade County: 52% of tests at or above 4 pCi/L · 197 tests Mellette County: no data Miner County: 50% of tests at or above 4 pCi/L · 4 tests Minnehaha County: 58% of tests at or above 4 pCi/L · 1,920 tests Moody County: 70% of tests at or above 4 pCi/L · 20 tests Pennington County: 54% of tests at or above 4 pCi/L · 1,029 tests Perkins County: 77% of tests at or above 4 pCi/L · 13 tests Potter County: 0% of tests at or above 4 pCi/L · 1 tests Roberts County: 46% of tests at or above 4 pCi/L · 26 tests Sanborn County: 71% of tests at or above 4 pCi/L · 7 tests Shannon County: no data Spink County: 50% of tests at or above 4 pCi/L · 24 tests Stanley County: 67% of tests at or above 4 pCi/L · 3 tests Sully County: 100% of tests at or above 4 pCi/L · 1 tests Todd County: 100% of tests at or above 4 pCi/L · 1 tests Tripp County: 56% of tests at or above 4 pCi/L · 9 tests Turner County: 59% of tests at or above 4 pCi/L · 58 tests Union County: 51% of tests at or above 4 pCi/L · 348 tests Walworth County: 56% of tests at or above 4 pCi/L · 18 tests Yankton County: 73% of tests at or above 4 pCi/L · 118 tests Ziebach County: 100% of tests at or above 4 pCi/L · 3 tests
  • Under 10%
  • 10–20%
  • 20–30%
  • 30–40%
  • 40% or more
  • No data

Counties

County Tests % ≥ 4 pCi/L Median (pCi/L) EPA zone (1993) Source
Aurora County 15 40% 2.7 Zone 1 Radon test results from laboratories through 2017
Beadle County 54 59% 4.8 Zone 1 Radon test results from laboratories through 2017
Bennett County 3 33% 3.0 Zone 2 Radon test results from laboratories through 2017
Bon Homme County 62 74% 7.2 Zone 1 Radon test results from laboratories through 2017
Brookings County 356 69% 6.6 Zone 1 Radon test results from laboratories through 2017
Brown County 62 71% 5.9 Zone 1 Radon test results from laboratories through 2017
Brule County 37 68% 6.4 Zone 1 Radon test results from laboratories through 2017
Buffalo County — — — Zone 1 —
Butte County 24 58% 5.4 Zone 2 Radon test results from laboratories through 2017
Campbell County 7 29% 2.4 Zone 1 Radon test results from laboratories through 2017
Charles Mix County 28 61% 6.5 Zone 1 Radon test results from laboratories through 2017
Clark County 9 78% 5.9 Zone 1 Radon test results from laboratories through 2017
Clay County 83 52% 4.2 Zone 1 Radon test results from laboratories through 2017
Codington County 77 65% 5.8 Zone 1 Radon test results from laboratories through 2017
Corson County — — — Zone 1 —
Custer County 108 66% 6.2 Zone 2 Radon test results from laboratories through 2017
Davison County 84 49% 3.8 Zone 1 Radon test results from laboratories through 2017
Day County 11 55% 4.5 Zone 1 Radon test results from laboratories through 2017
Deuel County 25 76% 6.2 Zone 1 Radon test results from laboratories through 2017
Dewey County 1 0% 0.6 Zone 2 Radon test results from laboratories through 2017
Douglas County 3 0% 1.3 Zone 1 Radon test results from laboratories through 2017
Edmunds County 12 67% 5.9 Zone 1 Radon test results from laboratories through 2017
Fall River County 24 63% 5.8 Zone 2 Radon test results from laboratories through 2017
Faulk County 1 100% 32.2 Zone 1 Radon test results from laboratories through 2017
Grant County 78 55% 5.0 Zone 1 Radon test results from laboratories through 2017
Gregory County 15 67% 5.3 Zone 2 Radon test results from laboratories through 2017
Haakon County 5 80% 8.0 Zone 2 Radon test results from laboratories through 2017
Hamlin County 13 77% 6.3 Zone 1 Radon test results from laboratories through 2017
Hand County 11 82% 4.8 Zone 1 Radon test results from laboratories through 2017
Hanson County 8 25% 2.8 Zone 1 Radon test results from laboratories through 2017
Harding County 1 100% 5.1 Zone 2 Radon test results from laboratories through 2017
Hughes County 71 70% 5.7 Zone 1 Radon test results from laboratories through 2017
Hutchinson County 39 67% 5.8 Zone 1 Radon test results from laboratories through 2017
Hyde County 7 57% 4.9 Zone 1 Radon test results from laboratories through 2017
Jackson County 1 0% 1.1 Zone 2 Radon test results from laboratories through 2017
Jerauld County 23 70% 8.8 Zone 1 Radon test results from laboratories through 2017
Jones County 8 75% 20.8 Zone 2 Radon test results from laboratories through 2017
Kingsbury County 44 68% 7.4 Zone 1 Radon test results from laboratories through 2017
Lake County 50 76% 8.5 Zone 1 Radon test results from laboratories through 2017
Lawrence County 160 57% 5.3 Zone 2 Radon test results from laboratories through 2017
Lincoln County 795 56% 4.7 Zone 1 Radon test results from laboratories through 2017
Lyman County 2 100% 22.1 Zone 1 Radon test results from laboratories through 2017
Marshall County 16 81% 10.5 Zone 1 Radon test results from laboratories through 2017
McCook County 30 50% 3.9 Zone 1 Radon test results from laboratories through 2017
McPherson County 12 58% 4.8 Zone 1 Radon test results from laboratories through 2017
Meade County 197 52% 4.1 Zone 2 Radon test results from laboratories through 2017
Mellette County — — — Zone 2 —
Miner County 4 50% 3.9 Zone 1 Radon test results from laboratories through 2017
Minnehaha County 1,920 58% 4.8 Zone 1 Radon test results from laboratories through 2017
Moody County 20 70% 6.2 Zone 1 Radon test results from laboratories through 2017
Pennington County 1,029 54% 4.3 Zone 2 Radon test results from laboratories through 2017
Perkins County 13 77% 8.1 Zone 1 Radon test results from laboratories through 2017
Potter County 1 0% 1.2 Zone 1 Radon test results from laboratories through 2017
Roberts County 26 46% 3.8 Zone 1 Radon test results from laboratories through 2017
Sanborn County 7 71% 5.5 Zone 1 Radon test results from laboratories through 2017
Shannon County — — — Zone 2 —
Spink County 24 50% 3.8 Zone 1 Radon test results from laboratories through 2017
Stanley County 3 67% 4.2 Zone 1 Radon test results from laboratories through 2017
Sully County 1 100% 4.1 Zone 1 Radon test results from laboratories through 2017
Todd County 1 100% 4.7 Zone 2 Radon test results from laboratories through 2017
Tripp County 9 56% 4.2 Zone 2 Radon test results from laboratories through 2017
Turner County 58 59% 4.8 Zone 1 Radon test results from laboratories through 2017
Union County 348 51% 4.1 Zone 1 Radon test results from laboratories through 2017
Walworth County 18 56% 4.7 Zone 1 Radon test results from laboratories through 2017
Yankton County 118 73% 6.3 Zone 1 Radon test results from laboratories through 2017
Ziebach County 3 100% 11.6 Zone 2 Radon test results from laboratories through 2017

Test your home

County figures show how often tests come back high, not the level in your home. Only a test tells you that: see how to test for radon.

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