95 county guides · Data snapshot October 16, 2026
Tennessee radon by county: all 95 county guides
Start with the county, not the statewide label. Compare EPA zone classifications with carefully reviewed Tennessee dashboard observations, then open the local guide for building-code findings, testing access, and the evidence behind each number.
All 95 Tennessee counties, A–Z
Each guide covers the county’s EPA radon zone, local building-code rules for new homes, state test data where it could be confirmed, and how to test.
- Anderson County Zone 1
- Bedford County Zone 1
- Benton County Zone 2
- Bledsoe County Zone 3
- Blount County Zone 1
- Bradley County Zone 1
- Campbell County Zone 3
- Cannon County Zone 2
- Carroll County Zone 3
- Carter County Zone 2
- Cheatham County Zone 2
- Chester County Zone 2
- Claiborne County Zone 1
- Clay County Zone 3
- Cocke County Zone 2
- Coffee County Zone 2
- Crockett County Zone 3
- Cumberland County Zone 3
- Davidson County Zone 1
- DeKalb County Zone 2
- Decatur County Zone 2
- Dickson County Zone 2
- Dyer County Zone 3
- Fayette County Zone 3
- Fentress County Zone 2
- Franklin County Zone 3
- Gibson County Zone 3
- Giles County Zone 1
- Grainger County Zone 1
- Greene County Zone 1
- Grundy County Zone 3
- Hamblen County Zone 1
- Hamilton County Zone 2
- Hancock County Zone 1
- Hardeman County Zone 3
- Hardin County Zone 2
- Hawkins County Zone 1
- Haywood County Zone 3
- Henderson County Zone 2
- Henry County Zone 3
- Hickman County Zone 1
- Houston County Zone 2
- Humphreys County Zone 1
- Jackson County Zone 1
- Jefferson County Zone 1
- Johnson County Zone 2
- Knox County Zone 1
- Lake County Zone 3
- Lauderdale County Zone 3
- Lawrence County Zone 1
- Lewis County Zone 1
- Lincoln County Zone 1
- Loudon County Zone 1
- Macon County Zone 2
- Madison County Zone 3
- Marion County Zone 3
- Marshall County Zone 1
- Maury County Zone 1
- McMinn County Zone 1
- McNairy County Zone 2
- Meigs County Zone 1
- Monroe County Zone 1
- Montgomery County Zone 2
- Moore County Zone 1
- Morgan County Zone 3
- Obion County Zone 3
- Overton County Zone 2
- Perry County Zone 1
- Pickett County No zone
- Polk County Zone 2
- Putnam County Zone 2
- Rhea County Zone 3
- Roane County Zone 1
- Robertson County Zone 2
- Rutherford County Zone 1
- Scott County Zone 3
- Sequatchie County Zone 3
- Sevier County Zone 2
- Shelby County Zone 3
- Smith County Zone 1
- Stewart County Zone 2
- Sullivan County Zone 1
- Sumner County Zone 2
- Tipton County Zone 3
- Trousdale County Zone 1
- Unicoi County Zone 2
- Union County Zone 1
- Van Buren County Zone 2
- Warren County Zone 2
- Washington County Zone 1
- Wayne County Zone 1
- Weakley County Zone 3
- White County Zone 2
- Williamson County Zone 1
- Wilson County Zone 1
Town radon guides
Whether new homes must be built radon-resistant depends on the town that issues the permit. These towns have their own short guides.
- Athens, TN McMinn Co.
- Bartlett, TN Shelby Co.
- Brentwood, TN Williamson Co.
- Chattanooga, TN Hamilton Co.
- Clarksville, TN Montgomery Co.
- Cleveland, TN Bradley Co.
- Columbia, TN Maury Co.
- Cookeville, TN Putnam Co.
- Crossville, TN Cumberland Co.
- Dickson, TN Dickson Co.
- Dyersburg, TN Dyer Co.
- Franklin, TN Williamson Co.
- Gallatin, TN Sumner Co.
- Greeneville, TN Greene Co.
- Hendersonville, TN Sumner Co.
- Hohenwald, TN Lewis Co.
- Jackson, TN Madison Co.
- Jefferson City, TN Jefferson Co.
- Johnson City, TN Washington Co.
- Kingsport, TN Sullivan Co.
- Knoxville, TN Knox Co.
- La Vergne, TN Rutherford Co.
- Lawrenceburg, TN Lawrence Co.
- Lebanon, TN Wilson Co.
- Lewisburg, TN Marshall Co.
- Manchester, TN Coffee Co.
- Maryville, TN Blount Co.
- McMinnville, TN Warren Co.
- Memphis, TN Shelby Co.
- Morristown, TN Hamblen Co.
- Mount Juliet, TN Wilson Co.
- Murfreesboro, TN Rutherford Co.
- Nashville, TN Davidson Co.
- Nolensville, TN Williamson Co.
- Oak Ridge, TN Anderson Co.
- Paris, TN Henry Co.
- Pleasant View, TN Cheatham Co.
- Smyrna, TN Rutherford Co.
- Sparta, TN White Co.
- Spring Hill, TN Maury Co.
- Thompson's Station, TN Williamson Co.
- Tullahoma, TN Coffee Co.
Read the gaps as carefully as the numbers.
The dashboard figures come from a small, self-selected set of tests—not a census of county homes. A dash means a value was unavailable or intentionally withheld, never that the level was zero. “No events” means no tests were mapped in the 2022–2023 dashboard dataset; it does not mean no radon. EPA zones describe broad potential, not the result in a particular home.