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Radon zones in Tennessee

The EPA assigns every county in Tennessee to one of three radon potential zones. 39 are in Zone 1, the highest category, home to about 52% of the state's residents.

95
Counties
39
Zone 1 counties
Predicted average above 4 pCi/L
32
Zone 2 counties
Predicted average 2-4 pCi/L
24
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Tennessee

Every county in Tennessee, 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 · 39Zone 2 · 32Zone 3 · 24

Hover a county · click to open it

County by county

All 95 Tennessee counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Anderson County180k9.5%18.5%46.5
Bedford County153k9.2%19.4%57.1
Blount County1141k9.0%16.6%41.6
Bradley County1112k9.0%17.6%47.1
Claiborne County133k11.3%20.9%63.5
Davidson County1712k6.2%14.0%33.4
Giles County131k10.5%19.5%48.8
Grainger County125k11.6%21.3%65.3
Greene County173k11.3%20.6%50.7
Hamblen County166k10.6%20.9%49.7
Hancock County16,95617.6%29.4%53.3
Hawkins County159k11.8%21.2%55.5
Hickman County126k10.3%20.9%67.0
Humphreys County119k10.9%20.6%55.2
Jackson County112k13.1%23.2%60.3
Jefferson County158k9.7%18.1%49.3
Knox County1501k7.4%15.0%38.9
Lawrence County146k11.2%21.4%48.6
Lewis County113k11.1%20.8%70.2
Lincoln County136k10.0%18.9%42.2
Loudon County161k9.9%15.9%39.3
Macon County127k10.9%22.7%66.5
Madison County199k9.1%18.4%42.3
Marshall County137k9.1%18.8%55.6
McMinn County156k10.5%19.7%54.7
Meigs County114k11.9%22.2%51.0
Monroe County149k11.8%21.7%57.4
Moore County16,74810.2%18.8% -
Perry County18,89112.8%23.6%53.7
Roane County156k10.5%18.9%44.4
Rutherford County1367k6.2%14.6%39.5
Smith County121k9.7%19.7%53.1
Sullivan County1162k10.3%19.2%48.7
Trousdale County112k8.2%20.8%83.3
Union County121k10.9%21.3%70.9
Washington County1138k8.8%16.9%39.7
Wayne County116k11.8%23.1%56.8
Williamson County1264k5.2%10.4%21.5
Wilson County1164k6.8%14.4%39.7
Benton County216k12.7%22.4%58.8
Cannon County215k10.8%20.8%48.5
Carter County257k11.6%20.5%47.7
Cheatham County242k8.2%17.4%55.1
Chester County218k9.8%19.4%52.9
Clay County27,71413.8%23.1%50.1
Cocke County237k13.4%23.9%57.9
Coffee County261k10.0%19.9%54.8
Decatur County212k13.6%23.8%60.7
DeKalb County221k11.8%22.2%63.2
Dickson County257k8.6%18.0%54.7
Fentress County220k13.3%22.5%57.3
Hamilton County2380k7.7%15.4%35.5
Hardin County227k13.0%22.7%52.9
Henderson County228k10.9%21.5%57.3
Houston County28,39310.5%20.2%66.4
Johnson County218k13.3%23.2%49.1
Marion County229k11.9%21.7%52.2
McNairy County226k11.8%22.0%55.0
Montgomery County2240k6.1%15.6%45.0
Overton County223k12.3%22.7%67.0
Pickett County25,12815.2%23.5%56.6
Polk County218k11.0%20.7%56.5
Putnam County284k8.9%17.6%49.3
Robertson County277k8.2%18.0%50.8
Sevier County299k10.1%18.8%43.0
Stewart County214k9.8%18.7%50.9
Sumner County2208k7.5%15.3%40.7
Unicoi County218k12.2%21.4%48.3
Van Buren County26,49311.8%21.1%52.2
Warren County243k10.8%21.4%52.1
White County229k11.9%22.1%50.4
Bledsoe County315k13.5%25.6%40.1
Campbell County340k12.4%22.8%69.7
Carroll County329k10.5%19.8%54.7
Crockett County314k10.0%19.5%65.5
Cumberland County365k12.7%19.4%37.5
Dyer County336k10.2%20.1%58.8
Fayette County344k8.9%16.5%28.0
Franklin County345k9.5%17.7%42.3
Gibson County351k9.9%20.1%65.9
Grundy County314k13.1%24.2%55.4
Hardeman County326k10.5%22.2%56.3
Haywood County317k12.0%22.9%43.2
Henry County333k12.1%21.0%54.0
Lake County36,34714.3%29.4%59.2
Lauderdale County325k11.2%23.4%62.8
Maury County3111k7.8%16.4%37.9
Morgan County322k11.1%22.2%53.3
Obion County330k11.4%21.1%60.2
Rhea County334k11.4%21.5%64.2
Scott County322k13.8%26.4%55.2
Sequatchie County317k12.8%22.7%40.5
Shelby County3910k7.9%17.2%35.9
Tipton County362k8.9%19.0%57.4
Weakley County333k10.0%19.0%54.5

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 Tennessee

These 39 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