Radon levels in South Carolina

Verified county-level radon indicators are available for 46 South Carolina counties. Select a county for its source period and sample details.

High results are most common in Oconee County (43%) and least common in Florence County (0%)Share of tests at or above 4 pCi/L by county · Radon test results from laboratories, 2008–2017 · 46 of 46 counties have data
Abbeville County: 23% of tests at or above 4 pCi/L · 66 testsAiken County: 13% of tests at or above 4 pCi/L · 241 testsAllendale County: 0% of tests at or above 4 pCi/L · 1 testsAnderson County: 11% of tests at or above 4 pCi/L · 1,733 testsBamberg County: 5% of tests at or above 4 pCi/L · 20 testsBarnwell County: 0% of tests at or above 4 pCi/L · 6 testsBeaufort County: 2% of tests at or above 4 pCi/L · 246 testsBerkeley County: 4% of tests at or above 4 pCi/L · 99 testsCalhoun County: 0% of tests at or above 4 pCi/L · 11 testsCharleston County: 1% of tests at or above 4 pCi/L · 272 testsCherokee County: 14% of tests at or above 4 pCi/L · 153 testsChester County: 22% of tests at or above 4 pCi/L · 18 testsChesterfield County: 0% of tests at or above 4 pCi/L · 10 testsClarendon County: 0% of tests at or above 4 pCi/L · 3 testsColleton County: 9% of tests at or above 4 pCi/L · 11 testsDarlington County: 0% of tests at or above 4 pCi/L · 28 testsDillon County: 0% of tests at or above 4 pCi/L · 18 testsDorchester County: 5% of tests at or above 4 pCi/L · 104 testsEdgefield County: 25% of tests at or above 4 pCi/L · 12 testsFairfield County: 7% of tests at or above 4 pCi/L · 27 testsFlorence County: 0% of tests at or above 4 pCi/L · 59 testsGeorgetown County: 0% of tests at or above 4 pCi/L · 29 testsGreenville County: 20% of tests at or above 4 pCi/L · 12,004 testsGreenwood County: 7% of tests at or above 4 pCi/L · 113 testsHampton County: 0% of tests at or above 4 pCi/L · 6 testsHorry County: 1% of tests at or above 4 pCi/L · 106 testsJasper County: 0% of tests at or above 4 pCi/L · 9 testsKershaw County: 5% of tests at or above 4 pCi/L · 60 testsLancaster County: 14% of tests at or above 4 pCi/L · 374 testsLaurens County: 14% of tests at or above 4 pCi/L · 244 testsLee County: 0% of tests at or above 4 pCi/L · 3 testsLexington County: 13% of tests at or above 4 pCi/L · 591 testsMcCormick County: 0% of tests at or above 4 pCi/L · 10 testsMarion County: 0% of tests at or above 4 pCi/L · 9 testsMarlboro County: 0% of tests at or above 4 pCi/L · 7 testsNewberry County: 16% of tests at or above 4 pCi/L · 75 testsOconee County: 43% of tests at or above 4 pCi/L · 2,469 testsOrangeburg County: 6% of tests at or above 4 pCi/L · 53 testsPickens County: 24% of tests at or above 4 pCi/L · 1,717 testsRichland County: 5% of tests at or above 4 pCi/L · 671 testsSaluda County: 17% of tests at or above 4 pCi/L · 18 testsSpartanburg County: 19% of tests at or above 4 pCi/L · 3,280 testsSumter County: 12% of tests at or above 4 pCi/L · 42 testsUnion County: 0% of tests at or above 4 pCi/L · 27 testsWilliamsburg County: 0% of tests at or above 4 pCi/L · 14 testsYork County: 14% of tests at or above 4 pCi/L · 1,412 tests
  • Under 10%
  • 10–20%
  • 20–30%
  • 30–40%
  • 40% or more
  • No data

Counties

CountyTests% ≥ 4 pCi/LMedian (pCi/L)EPA zone (1993)Source
Abbeville County6623%1.8Zone 2Radon test results from laboratories through 2017
Aiken County24113%1.3Zone 3Radon test results from laboratories through 2017
Allendale County10%0.1Zone 3Radon test results from laboratories through 2017
Anderson County1,73311%1.1Zone 2Radon test results from laboratories through 2017
Bamberg County205%1.0Zone 3Radon test results from laboratories through 2017
Barnwell County60%1.9Zone 3Radon test results from laboratories through 2017
Beaufort County2462%0.7Zone 3Radon test results from laboratories through 2017
Berkeley County994%0.7Zone 3Radon test results from laboratories through 2017
Calhoun County110%0.6Zone 3Radon test results from laboratories through 2017
Charleston County2721%0.6Zone 3Radon test results from laboratories through 2017
Cherokee County15314%1.6Zone 2Radon test results from laboratories through 2017
Chester County1822%1.1Zone 3Radon test results from laboratories through 2017
Chesterfield County100%0.6Zone 3Radon test results from laboratories through 2017
Clarendon County30%0.8Zone 3Radon test results from laboratories through 2017
Colleton County119%0.1Zone 3Radon test results from laboratories through 2017
Darlington County280%0.6Zone 3Radon test results from laboratories through 2017
Dillon County180%0.3Zone 3Radon test results from laboratories through 2017
Dorchester County1045%1.0Zone 3Radon test results from laboratories through 2017
Edgefield County1225%1.2Zone 3Radon test results from laboratories through 2017
Fairfield County277%0.9Zone 3Radon test results from laboratories through 2017
Florence County590%0.7Zone 3Radon test results from laboratories through 2017
Georgetown County290%0.1Zone 3Radon test results from laboratories through 2017
Greenville County12,00420%1.7Zone 1Radon test results from laboratories through 2017
Greenwood County1137%1.0Zone 3Radon test results from laboratories through 2017
Hampton County60%0.1Zone 3Radon test results from laboratories through 2017
Horry County1061%0.6Zone 3Radon test results from laboratories through 2017
Jasper County90%0.6Zone 3Radon test results from laboratories through 2017
Kershaw County605%0.7Zone 3Radon test results from laboratories through 2017
Lancaster County37414%1.6Zone 3Radon test results from laboratories through 2017
Laurens County24414%1.3Zone 2Radon test results from laboratories through 2017
Lee County30%1.1Zone 3Radon test results from laboratories through 2017
Lexington County59113%0.9Zone 3Radon test results from laboratories through 2017
Marion County90%0.9Zone 3Radon test results from laboratories through 2017
Marlboro County70%0.9Zone 3Radon test results from laboratories through 2017
McCormick County100%1.1Zone 3Radon test results from laboratories through 2017
Newberry County7516%1.1Zone 3Radon test results from laboratories through 2017
Oconee County2,46943%3.3Zone 2Radon test results from laboratories through 2017
Orangeburg County536%0.9Zone 3Radon test results from laboratories through 2017
Pickens County1,71724%1.8Zone 2Radon test results from laboratories through 2017
Richland County6715%0.7Zone 3Radon test results from laboratories through 2017
Saluda County1817%1.1Zone 3Radon test results from laboratories through 2017
Spartanburg County3,28019%1.7Zone 2Radon test results from laboratories through 2017
Sumter County4212%1.3Zone 3Radon test results from laboratories through 2017
Union County270%1.0Zone 3Radon test results from laboratories through 2017
Williamsburg County140%0.6Zone 3Radon test results from laboratories through 2017
York County1,41214%1.2Zone 2Radon 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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