Radon levels in Tennessee

Verified county-level radon indicators are available for 95 Tennessee counties. Select a county for its source period and sample details.

High results are most common in Jefferson County (57%) and least common in Chester County (0%)Share of tests at or above 4 pCi/L by county · Radon test results from laboratories, 2008–2017 · 95 of 95 counties have data
Anderson County: 48% of tests at or above 4 pCi/L · 269 testsBedford County: 21% of tests at or above 4 pCi/L · 124 testsBenton County: 33% of tests at or above 4 pCi/L · 30 testsBledsoe County: 24% of tests at or above 4 pCi/L · 37 testsBlount County: 43% of tests at or above 4 pCi/L · 745 testsBradley County: 21% of tests at or above 4 pCi/L · 425 testsCampbell County: 54% of tests at or above 4 pCi/L · 71 testsCannon County: 11% of tests at or above 4 pCi/L · 56 testsCarroll County: 20% of tests at or above 4 pCi/L · 25 testsCarter County: 47% of tests at or above 4 pCi/L · 345 testsCheatham County: 34% of tests at or above 4 pCi/L · 205 testsChester County: 0% of tests at or above 4 pCi/L · 44 testsClaiborne County: 44% of tests at or above 4 pCi/L · 125 testsClay County: 35% of tests at or above 4 pCi/L · 46 testsCocke County: 46% of tests at or above 4 pCi/L · 56 testsCoffee County: 17% of tests at or above 4 pCi/L · 206 testsCrockett County: 21% of tests at or above 4 pCi/L · 19 testsCumberland County: 9% of tests at or above 4 pCi/L · 172 testsDavidson County: 36% of tests at or above 4 pCi/L · 5,592 testsDecatur County: 29% of tests at or above 4 pCi/L · 17 testsDeKalb County: 31% of tests at or above 4 pCi/L · 59 testsDickson County: 26% of tests at or above 4 pCi/L · 209 testsDyer County: 0% of tests at or above 4 pCi/L · 22 testsFayette County: 11% of tests at or above 4 pCi/L · 99 testsFentress County: 9% of tests at or above 4 pCi/L · 33 testsFranklin County: 26% of tests at or above 4 pCi/L · 266 testsGibson County: 5% of tests at or above 4 pCi/L · 57 testsGiles County: 41% of tests at or above 4 pCi/L · 140 testsGrainger County: 48% of tests at or above 4 pCi/L · 56 testsGreene County: 46% of tests at or above 4 pCi/L · 385 testsGrundy County: 0% of tests at or above 4 pCi/L · 29 testsHamblen County: 45% of tests at or above 4 pCi/L · 186 testsHamilton County: 19% of tests at or above 4 pCi/L · 1,148 testsHancock County: 9% of tests at or above 4 pCi/L · 22 testsHardeman County: 20% of tests at or above 4 pCi/L · 5 testsHardin County: 8% of tests at or above 4 pCi/L · 38 testsHawkins County: 38% of tests at or above 4 pCi/L · 289 testsHaywood County: 0% of tests at or above 4 pCi/L · 23 testsHenderson County: 17% of tests at or above 4 pCi/L · 30 testsHenry County: 17% of tests at or above 4 pCi/L · 60 testsHickman County: 35% of tests at or above 4 pCi/L · 120 testsHouston County: 29% of tests at or above 4 pCi/L · 14 testsHumphreys County: 24% of tests at or above 4 pCi/L · 105 testsJackson County: 47% of tests at or above 4 pCi/L · 49 testsJefferson County: 57% of tests at or above 4 pCi/L · 146 testsJohnson County: 34% of tests at or above 4 pCi/L · 157 testsKnox County: 34% of tests at or above 4 pCi/L · 2,452 testsLake County: 0% of tests at or above 4 pCi/L · 7 testsLauderdale County: 11% of tests at or above 4 pCi/L · 9 testsLawrence County: 21% of tests at or above 4 pCi/L · 136 testsLewis County: 16% of tests at or above 4 pCi/L · 56 testsLincoln County: 21% of tests at or above 4 pCi/L · 149 testsLoudon County: 54% of tests at or above 4 pCi/L · 859 testsMcMinn County: 34% of tests at or above 4 pCi/L · 106 testsMcNairy County: 8% of tests at or above 4 pCi/L · 59 testsMacon County: 19% of tests at or above 4 pCi/L · 67 testsMadison County: 9% of tests at or above 4 pCi/L · 92 testsMarion County: 28% of tests at or above 4 pCi/L · 74 testsMarshall County: 18% of tests at or above 4 pCi/L · 138 testsMaury County: 39% of tests at or above 4 pCi/L · 509 testsMeigs County: 34% of tests at or above 4 pCi/L · 29 testsMonroe County: 46% of tests at or above 4 pCi/L · 189 testsMontgomery County: 34% of tests at or above 4 pCi/L · 597 testsMoore County: 35% of tests at or above 4 pCi/L · 51 testsMorgan County: 6% of tests at or above 4 pCi/L · 31 testsObion County: 11% of tests at or above 4 pCi/L · 36 testsOverton County: 41% of tests at or above 4 pCi/L · 128 testsPerry County: 33% of tests at or above 4 pCi/L · 40 testsPickett County: 47% of tests at or above 4 pCi/L · 43 testsPolk County: 28% of tests at or above 4 pCi/L · 43 testsPutnam County: 36% of tests at or above 4 pCi/L · 336 testsRhea County: 27% of tests at or above 4 pCi/L · 45 testsRoane County: 34% of tests at or above 4 pCi/L · 258 testsRobertson County: 29% of tests at or above 4 pCi/L · 273 testsRutherford County: 15% of tests at or above 4 pCi/L · 1,200 testsScott County: 3% of tests at or above 4 pCi/L · 39 testsSequatchie County: 21% of tests at or above 4 pCi/L · 58 testsSevier County: 53% of tests at or above 4 pCi/L · 328 testsShelby County: 6% of tests at or above 4 pCi/L · 384 testsSmith County: 45% of tests at or above 4 pCi/L · 55 testsStewart County: 26% of tests at or above 4 pCi/L · 95 testsSullivan County: 51% of tests at or above 4 pCi/L · 1,799 testsSumner County: 26% of tests at or above 4 pCi/L · 1,311 testsTipton County: 5% of tests at or above 4 pCi/L · 88 testsTrousdale County: 27% of tests at or above 4 pCi/L · 33 testsUnicoi County: 37% of tests at or above 4 pCi/L · 132 testsUnion County: 38% of tests at or above 4 pCi/L · 53 testsVan Buren County: 41% of tests at or above 4 pCi/L · 22 testsWarren County: 37% of tests at or above 4 pCi/L · 149 testsWashington County: 50% of tests at or above 4 pCi/L · 1,590 testsWayne County: 8% of tests at or above 4 pCi/L · 26 testsWeakley County: 13% of tests at or above 4 pCi/L · 16 testsWhite County: 49% of tests at or above 4 pCi/L · 147 testsWilliamson County: 26% of tests at or above 4 pCi/L · 3,414 testsWilson County: 20% of tests at or above 4 pCi/L · 959 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
Anderson County26948%3.8Zone 1Radon test results from laboratories through 2017
Bedford County12421%1.8Zone 1Radon test results from laboratories through 2017
Benton County3033%2.0Zone 2Radon test results from laboratories through 2017
Bledsoe County3724%2.1Zone 3Radon test results from laboratories through 2017
Blount County74543%3.4Zone 1Radon test results from laboratories through 2017
Bradley County42521%1.9Zone 1Radon test results from laboratories through 2017
Campbell County7154%4.5Zone 3Radon test results from laboratories through 2017
Cannon County5611%1.3Zone 2Radon test results from laboratories through 2017
Carroll County2520%1.0Zone 3Radon test results from laboratories through 2017
Carter County34547%3.7Zone 2Radon test results from laboratories through 2017
Cheatham County20534%2.3Zone 2Radon test results from laboratories through 2017
Chester County440%1.1Zone 2Radon test results from laboratories through 2017
Claiborne County12544%3.3Zone 1Radon test results from laboratories through 2017
Clay County4635%2.3Zone 2Radon test results from laboratories through 2017
Cocke County5646%3.8Zone 2Radon test results from laboratories through 2017
Coffee County20617%1.3Zone 2Radon test results from laboratories through 2017
Crockett County1921%1.2Zone 3Radon test results from laboratories through 2017
Cumberland County1729%1.3Zone 3Radon test results from laboratories through 2017
Davidson County5,59236%2.6Zone 1Radon test results from laboratories through 2017
DeKalb County5931%3.1Zone 2Radon test results from laboratories through 2017
Decatur County1729%1.7Zone 2Radon test results from laboratories through 2017
Dickson County20926%2.1Zone 2Radon test results from laboratories through 2017
Dyer County220%1.4Zone 3Radon test results from laboratories through 2017
Fayette County9911%1.1Zone 3Radon test results from laboratories through 2017
Fentress County339%1.3Zone 2Radon test results from laboratories through 2017
Franklin County26626%2.1Zone 3Radon test results from laboratories through 2017
Gibson County575%1.0Zone 3Radon test results from laboratories through 2017
Giles County14041%3.3Zone 1Radon test results from laboratories through 2017
Grainger County5648%3.8Zone 1Radon test results from laboratories through 2017
Greene County38546%3.6Zone 1Radon test results from laboratories through 2017
Grundy County290%1.0Zone 3Radon test results from laboratories through 2017
Hamblen County18645%3.5Zone 1Radon test results from laboratories through 2017
Hamilton County1,14819%1.7Zone 2Radon test results from laboratories through 2017
Hancock County229%1.8Zone 1Radon test results from laboratories through 2017
Hardeman County520%1.6Zone 3Radon test results from laboratories through 2017
Hardin County388%1.0Zone 2Radon test results from laboratories through 2017
Hawkins County28938%2.7Zone 1Radon test results from laboratories through 2017
Haywood County230%0.7Zone 3Radon test results from laboratories through 2017
Henderson County3017%1.6Zone 2Radon test results from laboratories through 2017
Henry County6017%1.6Zone 3Radon test results from laboratories through 2017
Hickman County12035%2.2Zone 1Radon test results from laboratories through 2017
Houston County1429%2.8Zone 2Radon test results from laboratories through 2017
Humphreys County10524%2.0Zone 1Radon test results from laboratories through 2017
Jackson County4947%3.9Zone 1Radon test results from laboratories through 2017
Jefferson County14657%4.7Zone 1Radon test results from laboratories through 2017
Johnson County15734%2.3Zone 2Radon test results from laboratories through 2017
Knox County2,45234%2.5Zone 1Radon test results from laboratories through 2017
Lake County70%1.0Zone 3Radon test results from laboratories through 2017
Lauderdale County911%1.3Zone 3Radon test results from laboratories through 2017
Lawrence County13621%1.6Zone 1Radon test results from laboratories through 2017
Lewis County5616%1.4Zone 1Radon test results from laboratories through 2017
Lincoln County14921%1.9Zone 1Radon test results from laboratories through 2017
Loudon County85954%4.4Zone 1Radon test results from laboratories through 2017
Macon County6719%1.9Zone 2Radon test results from laboratories through 2017
Madison County929%1.2Zone 3Radon test results from laboratories through 2017
Marion County7428%1.6Zone 3Radon test results from laboratories through 2017
Marshall County13818%1.6Zone 1Radon test results from laboratories through 2017
Maury County50939%3.0Zone 1Radon test results from laboratories through 2017
McMinn County10634%2.8Zone 1Radon test results from laboratories through 2017
McNairy County598%1.0Zone 2Radon test results from laboratories through 2017
Meigs County2934%2.5Zone 1Radon test results from laboratories through 2017
Monroe County18946%3.5Zone 1Radon test results from laboratories through 2017
Montgomery County59734%2.3Zone 2Radon test results from laboratories through 2017
Moore County5135%2.9Zone 1Radon test results from laboratories through 2017
Morgan County316%1.7Zone 3Radon test results from laboratories through 2017
Obion County3611%1.8Zone 3Radon test results from laboratories through 2017
Overton County12841%2.8Zone 2Radon test results from laboratories through 2017
Perry County4033%2.0Zone 1Radon test results from laboratories through 2017
Pickett County4347%3.5Zone 2Radon test results from laboratories through 2017
Polk County4328%2.2Zone 2Radon test results from laboratories through 2017
Putnam County33636%2.6Zone 2Radon test results from laboratories through 2017
Rhea County4527%2.4Zone 3Radon test results from laboratories through 2017
Roane County25834%2.5Zone 1Radon test results from laboratories through 2017
Robertson County27329%1.9Zone 2Radon test results from laboratories through 2017
Rutherford County1,20015%1.5Zone 1Radon test results from laboratories through 2017
Scott County393%1.3Zone 3Radon test results from laboratories through 2017
Sequatchie County5821%1.9Zone 3Radon test results from laboratories through 2017
Sevier County32853%4.4Zone 2Radon test results from laboratories through 2017
Shelby County3846%1.0Zone 3Radon test results from laboratories through 2017
Smith County5545%3.1Zone 1Radon test results from laboratories through 2017
Stewart County9526%2.1Zone 2Radon test results from laboratories through 2017
Sullivan County1,79951%4.2Zone 1Radon test results from laboratories through 2017
Sumner County1,31126%1.9Zone 2Radon test results from laboratories through 2017
Tipton County885%1.0Zone 3Radon test results from laboratories through 2017
Trousdale County3327%1.8Zone 1Radon test results from laboratories through 2017
Unicoi County13237%2.8Zone 2Radon test results from laboratories through 2017
Union County5338%2.1Zone 1Radon test results from laboratories through 2017
Van Buren County2241%2.1Zone 2Radon test results from laboratories through 2017
Warren County14937%3.0Zone 2Radon test results from laboratories through 2017
Washington County1,59050%3.9Zone 1Radon test results from laboratories through 2017
Wayne County268%1.7Zone 1Radon test results from laboratories through 2017
Weakley County1613%1.1Zone 3Radon test results from laboratories through 2017
White County14749%3.9Zone 2Radon test results from laboratories through 2017
Williamson County3,41426%2.0Zone 1Radon test results from laboratories through 2017
Wilson County95920%1.7Zone 1Radon 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.

Sponsored: we earn a commission on purchases through these links. We haven't tested Airthings monitors yet.

Prefer a digital monitor? See Airthings radon monitors, or enter code radonbycounty-10OFF at their discount store for 10% off.