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Radon Levels, Testing and Mitigation in Tennessee

Tennessee has 94 counties, with 38 classified as EPA Zone 1 (highest risk). With an average radon level of 7.83 pCi/L, Tennessee state testing data reveals significantly elevated risks across multiple counties. Testing is highly recommended.

Tennessee is the 36th most expansive state in terms of size and the 17th most populous. It also happens to be the 21st most densely populated state in the entire country.

Tennessee does have an active radon program, dedicated to educating citizens about the risks associated with the deadly gas. You can find more information on Radon, testing and mitigation at the official page.

7.83
Avg. pCi/L
94
Counties
38
Zone 1 Counties

Tennessee Radon Map

Tennessee radon levels by county
Zone 1 — High
Zone 2 — Moderate
Zone 3 — Low

Tennessee Metro Areas

Explore radon data organized by metro region, including average levels, hotspot cities, and local mitigation professionals.

Chattanooga Metro
5 cities
Clarksville Metro
5 cities
Jackson Metro
5 cities
Johnson City Metro
5 cities
Kingsport Metro
5 cities
Knoxville Metro
5 cities
Memphis Metro
5 cities
Nashville Metro
5 cities

Most Active Radon Markets in Tennessee

Cities with the most user-submitted radon test data, ranked by number of submissions.

CityAvg User Radon LevelSubmissions
Elizabethton 7.33 pCi/L 3
Cleveland 5.33 pCi/L 3
Johnson City 4.33 pCi/L 3
Maryville 10.50 pCi/L 2
Columbia 8.50 pCi/L 2
Bristol 6.50 pCi/L 2
Chattanooga 5.00 pCi/L 2
Clarksville 20.00 pCi/L 1
Kingsport 5.00 pCi/L 1
Knoxville 4.00 pCi/L 1
Greeneville No submissions 0
Murfreesboro No submissions 0

Tennessee Counties by EPA Radon Zone

All 94 Tennessee counties with their EPA radon zone classification and user-submitted average radon levels.

Zone 1 — High Risk
Predicted avg. indoor levels > 4.0 pCi/L
Zone 1 38 counties
Anderson County Zone 1
Avg: 7.0 pCi/L
Bedford County Zone 1
Avg: 10.5 pCi/L
Blount County Zone 1
Avg: 13.7 pCi/L
Bradley County Zone 1
Avg: 5.3 pCi/L
Claiborne County Zone 1
Avg:
Davidson County Zone 1
Avg: 7.0 pCi/L
Giles County Zone 1
Avg:
Grainger County Zone 1
Avg:
Greene County Zone 1
Avg:
Hamblen County Zone 1
Avg: 7.7 pCi/L
Hancock County Zone 1
Avg:
Hawkins County Zone 1
Avg:
Hickman County Zone 1
Avg:
Humphreys County Zone 1
Avg:
Jackson County Zone 1
Avg:
Jefferson County Zone 1
Avg: 4.5 pCi/L
Knox County Zone 1
Avg: 4.0 pCi/L
Lawrence County Zone 1
Avg:
Lewis County Zone 1
Avg:
Lincoln County Zone 1
Avg: 10.0 pCi/L
Loudon County Zone 1
Avg: 8.5 pCi/L
Marshall County Zone 1
Avg:
Maury County Zone 1
Avg: 8.5 pCi/L
McMinn County Zone 1
Avg: 15.0 pCi/L
Meigs County Zone 1
Avg:
Monroe County Zone 1
Avg: 9.0 pCi/L
Moore County Zone 1
Avg:
Perry County Zone 1
Avg:
Roane County Zone 1
Avg:
Rutherford County Zone 1
Avg: 7.0 pCi/L
Smith County Zone 1
Avg: 18.0 pCi/L
Sullivan County Zone 1
Avg: 8.6 pCi/L
Trousdale County Zone 1
Avg:
Union County Zone 1
Avg: 5.0 pCi/L
Washington County Zone 1
Avg: 6.0 pCi/L
Wayne County Zone 1
Avg:
Williamson County Zone 1
Avg: 6.3 pCi/L
Wilson County Zone 1
Avg: 3.5 pCi/L
Zone 2 — Moderate Risk
Predicted avg. indoor levels 2–4 pCi/L
Zone 2 28 counties
Benton County Zone 2
Avg:
Cannon County Zone 2
Avg:
Carter County Zone 2
Avg: 7.3 pCi/L
Cheatham County Zone 2
Avg: 2.0 pCi/L
Chester County Zone 2
Avg:
Cocke County Zone 2
Avg:
Coffee County Zone 2
Avg:
Decatur County Zone 2
Avg:
Dickson County Zone 2
Avg:
Fentress County Zone 2
Avg:
Hamilton County Zone 2
Avg: 5.7 pCi/L
Hardin County Zone 2
Avg:
Henderson County Zone 2
Avg:
Houston County Zone 2
Avg:
Johnson County Zone 2
Avg: 20.0 pCi/L
Macon County Zone 2
Avg:
McNairy County Zone 2
Avg:
Montgomery County Zone 2
Avg: 20.0 pCi/L
Overton County Zone 2
Avg:
Polk County Zone 2
Avg:
Putnam County Zone 2
Avg: 4.0 pCi/L
Robertson County Zone 2
Avg: 6.0 pCi/L
Sevier County Zone 2
Avg:
Stewart County Zone 2
Avg:
Sumner County Zone 2
Avg: 4.0 pCi/L
Unicoi County Zone 2
Avg:
Warren County Zone 2
Avg: 6.5 pCi/L
White County Zone 2
Avg: 12.0 pCi/L
Zone 3 — Low Risk
Predicted avg. indoor levels < 2 pCi/L
Zone 3 28 counties
Bledsoe County Zone 3
Avg:
Campbell County Zone 3
Avg: 12.0 pCi/L
Carroll County Zone 3
Avg:
Clay County Zone 3
Avg:
Crockett County Zone 3
Avg:
Cumberland County Zone 3
Avg: 4.5 pCi/L
Dyer County Zone 3
Avg:
Fayette County Zone 3
Avg:
Franklin County Zone 3
Avg: 4.0 pCi/L
Gibson County Zone 3
Avg:
Grundy County Zone 3
Avg:
Hardeman County Zone 3
Avg:
Haywood County Zone 3
Avg:
Henry County Zone 3
Avg:
Lake County Zone 3
Avg:
Lauderdale County Zone 3
Avg:
Madison County Zone 3
Avg: 10.0 pCi/L
Marion County Zone 3
Avg:
Morgan County Zone 3
Avg: 6.0 pCi/L
Obion County Zone 3
Avg:
Pickett County Zone 3
Avg:
Rhea County Zone 3
Avg:
Scott County Zone 3
Avg:
Sequatchie County Zone 3
Avg: 14.0 pCi/L
Shelby County Zone 3
Avg: 7.0 pCi/L
Tipton County Zone 3
Avg:
Van Buren County Zone 3
Avg:
Weakley County Zone 3
Avg:

Tennessee Cities & Towns

Browse radon data for individual cities across Tennessee. Each city page includes user-submitted radon levels, local contractors, and mitigation resources.

Adams Adamsville Afton Alamo Alcoa Alexandria Allardt Allons Allred Alpine Altamont Andersonville Antioch Apison Ardmore Arlington Arnold Afb Arrington Ashland City Athens Atoka Atwood Auburntown Bakewell Bath Springs Baxter Bean Station Beech Bluff Beechgrove Beersheba Springs Belfast Bell Buckle Bells Belvidere Benton Bethel Springs Bethpage Big Rock Big Sandy Birchwood Blaine Bloomington Springs Blountville Bluff City Bolivar Bon Aqua Bradford Bradyville Brentwood Briceville Brighton Bristol Brownsville Bruceton Brush Creek Buchanan Buena Vista Buffalo Valley Bulls Gap Bumpus Mills Burlison Burns Butler Bybee Byrdstown Calhoun Camden Carthage Caryville Castalian Springs Cedar Grove Cedar Hill Celina Centerville Chapel Hill Chapmansboro Charleston Charlotte Chattanooga Chestnut Mound Christiana Chuckey Church Hill Clairfield Clarkrange Clarksville Cleveland Clifton Clinton Coalmont College Grove Collierville Collinwood Columbia Cookeville Copperhill Cordova Cornersville Corryton Cosby Cottage Grove Cottontown Counce Covington Cowan Crab Orchard Crawford Cross Plains Crossville Crump Culleoka Cumberland City Cumberland Furnace Cumberland Gap Cunningham Cypress Inn Dandridge Darden Dayton Decatur Decaturville Decherd Deer Lodge Del Rio Delano Dellrose Denmark Dickson Dixon Springs Dover Dowelltown Doyle Dresden Drummonds Duck River Duff Dukedom Dunlap Dyer Dyersburg Eads Eagleville Eidson Elbridge Elizabethton Elmwood Elora Englewood Enville Erin Erwin Estill Springs Ethridge Etowah Eva Evensville Fairview Fall Branch Farner Fayetteville Finger Finley Five Points Flag Pond Flintville Frankewing Franklin Friendship Friendsville Gadsden Gainesboro Gallatin Gates Gatlinburg Georgetown Germantown Gleason Goodlettsville Goodspring Gordonsville Grand Junction Grandview Granville Graysville Greenback Greenbrier Greeneville Greenfield Grimsley Gruetli Laager Guild Guys Halls Hampshire Hampton Harriman Harrison Harrogate Hartford Hartsville Heiskell Helenwood Henderson Hendersonville Henning Henry Hermitage Hickman Hickory Valley Hilham Hillsboro Hixson Hohenwald Holladay Hollow Rock Hornbeak Hornsby Humboldt Huntingdon Huntland Huntsville Huron Hurricane Mills Indian Mound Iron City Jacks Creek Jacksboro Jackson Jamestown Jasper Jefferson City Jellico Joelton Johnson City Jonesborough Kelso Kenton Kingsport Kingston Kingston Springs Knoxville Kodak Kyles Ford La Follette La Vergne Lafayette Lake City Lancaster Lancing Lascassas Laurel Bloomery Lavinia Lawrenceburg Lebanon Lenoir City Lenox Leoma Lewisburg Lexington Liberty Limestone Linden Livingston Lobelville Lookout Mountain Loretto Loudon Louisville Lupton City Luray Luttrell Lutts Lyles Lynchburg Lynnville Madison Madisonville Manchester Mansfield Martin Maryville Mascot Mason Maynardville Mc Donald Mc Ewen Mc Kenzie Mcminnville Medina Medon Memphis Mercer Michie Middleton Midway Milan Milledgeville Millington Milton Minor Hill Mohawk Monroe Monteagle Monterey Mooresburg Morris Chapel Morrison Morristown Moscow Mosheim Moss Mount Carmel Mount Juliet Mount Pleasant Mountain City Mulberry Munford Murfreesboro Nashville New Johnsonville New Market New Tazewell Newbern Newcomb Newport Niota Nolensville Normandy Nunnelly Oak Ridge Oakdale Oakfield Oakland Obion Ocoee Old Fort Old Hickory Olivehill Oliver Springs Oneida Only Ooltewah Orlinda Pall Mall Palmer Palmersville Palmyra Paris Parrottsville Parsons Pegram Pelham Petersburg Philadelphia Pigeon Forge Pikeville Piney Flats Pinson Pioneer Pleasant Shade Pleasant View Pocahontas Portland Powder Springs Powell Primm Springs Prospect Pulaski Puryear Quebeck Ramer Readyville Reagan Red Boiling Springs Reliance Riceville Rickman Riddleton Ridgely Ripley Rives Roan Mountain Robbins Rock Island Rockford Rockvale Rockwood Rogersville Rossville Russellville Rutherford Rutledge Saint Joseph Sale Creek Saltillo Santa Fe Sardis Saulsbury Savannah Scotts Hill Selmer Sequatchie Sevierville Sewanee Seymour Shady Valley Sharon Sharps Chapel Shelbyville Sherwood Shiloh Signal Mountain Silver Point Smithville Smyrna Sneedville Soddy Daisy Somerville South Fulton South Pittsburg Southside Sparta Speedwell Spencer Spring City Spring Hill Springfield Springville Stanton Stantonville Stewart Strawberry Plains Sugar Tree Summertown Sunbright Surgoinsville Sweetwater Taft Talbott Tallassee Tazewell Telford Tellico Plains Ten Mile Tennessee Ridge Thompsons Station Thorn Hill Tiptonville Toone Townsend Tracy City Trade Trenton Trezevant Trimble Troy Tullahoma Turtletown Unicoi Union City Unionville Vanleer Vonore Walland Walling Wartburg Wartrace Washburn Watauga Watertown Waverly Waynesboro Westmoreland Westpoint Westport White Bluff White House White Pine Whites Creek Whitesburg Whiteside Whiteville Whitleyville Whitwell Wilder Wildersville Williamsport Williston Winchester Winfield Woodbury Woodlawn Yuma

Frequently Asked Questions About Radon in Tennessee

What radon level is considered "high"?
The EPA action level is 4.0 pCi/L — many homeowners also choose to fix levels between 2.0 and 4.0 pCi/L. Any home with levels at or above 4.0 pCi/L should be mitigated.
How much does radon mitigation cost in Tennessee?
Radon mitigation typically costs between $800 and $2,500, depending on foundation type and radon severity. A standard sub-slab depressurization system usually falls in the $1,000–$1,500 range.
Does mitigation actually work?
Yes — properly installed systems typically reduce radon levels by up to 99%. A post-mitigation test confirms the system is working correctly, and many homeowners re-test periodically.
Should I test again after mitigation?
Yes. A post-mitigation test is the proof your system is working. The EPA recommends testing within 30 days of installation and retesting every two years.
What EPA Radon Zone is my Tennessee county in?
Tennessee counties are classified into three EPA Radon Zones. Zone 1 (highest risk, >4 pCi/L) indicates the most concern. Zone 2 (moderate, 2–4 pCi/L) and Zone 3 (lowest, <2 pCi/L) round out the classification. Use the county directory above to find your specific county's zone and data.

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