Tennessee Radon Zone Map
Counties colored by EPA radon zone. Red = Zone 1, Orange = Zone 2, Green = Zone 3.
Highest-Risk Counties
Anderson50% above action level
BedfordZone 1 — High
Blount47.8% above action level
Bradley60% above action level
ClaiborneZone 1 — High
Davidson30.8% above action level
GilesZone 1 — High
GraingerZone 1 — High
Greene53.8% above action level
Hamblen36.4% above action level
HancockZone 1 — High
Hawkins54.5% above action level
+27 more
All 95 Counties — By Radon Risk
| County | EPA Zone | Tests | % Above 4 pCi/L |
|---|
| Anderson |
High |
12 |
50% |
| Bedford |
High |
7 |
— |
| Blount |
High |
23 |
47.8% |
| Bradley |
High |
15 |
60% |
| Claiborne |
High |
8 |
— |
| Davidson |
High |
91 |
30.8% |
| Giles |
High |
5 |
— |
| Grainger |
High |
5 |
— |
| Greene |
High |
13 |
53.8% |
| Hamblen |
High |
11 |
36.4% |
| Hancock |
High |
— |
— |
| Hawkins |
High |
11 |
54.5% |
| Hickman |
High |
6 |
— |
| Humphreys |
High |
— |
— |
| Jackson |
High |
— |
— |
| Jefferson |
High |
9 |
55.6% |
| Knox |
High |
70 |
38.6% |
| Lawrence |
High |
9 |
— |
| Lewis |
High |
— |
— |
| Lincoln |
High |
4 |
— |
| Loudon |
High |
12 |
— |
| Macon |
High |
— |
— |
| Madison |
High |
14 |
42.9% |
| Marshall |
High |
6 |
— |
| McMinn |
High |
11 |
45.5% |
| Meigs |
High |
— |
— |
| Monroe |
High |
12 |
33.3% |
| Moore |
High |
— |
— |
| Perry |
High |
— |
— |
| Roane |
High |
10 |
60% |
| Rutherford |
High |
36 |
33.3% |
| Smith |
High |
— |
— |
| Sullivan |
High |
29 |
48.3% |
| Trousdale |
High |
— |
— |
| Union |
High |
4 |
— |
| Washington |
High |
21 |
42.9% |
| Wayne |
High |
— |
— |
| Williamson |
High |
26 |
38.5% |
| Wilson |
High |
19 |
42.1% |
| Benton |
Moderate |
— |
— |
| Cannon |
Moderate |
— |
— |
| Carter |
Moderate |
11 |
36.4% |
| Cheatham |
Moderate |
6 |
— |
| Chester |
Moderate |
— |
— |
| Clay |
Moderate |
— |
— |
| Cocke |
Moderate |
7 |
— |
| Coffee |
Moderate |
10 |
40% |
| DeKalb |
Moderate |
4 |
— |
| Decatur |
Moderate |
— |
— |
| Dickson |
Moderate |
9 |
55.6% |
| Fentress |
Moderate |
5 |
— |
| Hamilton |
Moderate |
59 |
40.7% |
| Hardin |
Moderate |
5 |
— |
| Henderson |
Moderate |
4 |
— |
| Houston |
Moderate |
— |
— |
| Johnson |
Moderate |
6 |
— |
| Marion |
Moderate |
6 |
— |
| McNairy |
Moderate |
6 |
— |
| Montgomery |
Moderate |
24 |
33.3% |
| Overton |
Moderate |
5 |
— |
| Pickett |
Moderate |
— |
— |
| Polk |
Moderate |
— |
— |
| Putnam |
Moderate |
12 |
— |
| Robertson |
Moderate |
12 |
33.3% |
| Sevier |
Moderate |
16 |
50% |
| Stewart |
Moderate |
— |
— |
| Sumner |
Moderate |
29 |
37.9% |
| Unicoi |
Moderate |
— |
— |
| Van Buren |
Moderate |
— |
— |
| Warren |
Moderate |
6 |
— |
| White |
Moderate |
— |
— |
| Bledsoe |
Low |
— |
— |
| Campbell |
Low |
6 |
— |
| Carroll |
Low |
5 |
— |
| Crockett |
Low |
— |
— |
| Cumberland |
Low |
15 |
46.7% |
| Dyer |
Low |
6 |
— |
| Fayette |
Low |
7 |
57.1% |
| Franklin |
Low |
9 |
— |
| Gibson |
Low |
9 |
— |
| Grundy |
Low |
4 |
— |
| Hardeman |
Low |
5 |
— |
| Haywood |
Low |
4 |
— |
| Henry |
Low |
7 |
— |
| Lake |
Low |
— |
— |
| Lauderdale |
Low |
5 |
— |
| Maury |
Low |
15 |
33.3% |
| Morgan |
Low |
— |
— |
| Obion |
Low |
7 |
— |
| Rhea |
Low |
7 |
— |
| Scott |
Low |
— |
— |
| Sequatchie |
Low |
— |
— |
| Shelby |
Low |
126 |
30.2% |
| Tipton |
Low |
7 |
71.4% |
| Weakley |
Low |
5 |
— |
Sources: EPA Map of Radon Zones, CDC Environmental Health Tracking Network
Frequently Asked Questions
How many counties in Tennessee have high radon risk?
Tennessee has 39 counties classified as EPA Zone 1 (high radon risk), 32 as Zone 2 (moderate), and 24 as Zone 3 (low risk).
Is radon a problem in Tennessee?
Tennessee has 39 high-risk counties where elevated radon is likely. The EPA recommends all homes in Tennessee be tested for radon, regardless of which zone they're in.
How do I check radon levels for my Tennessee address?
Enter your ZIP code in the search box above to see your county's EPA radon zone and available testing data. For your specific home's radon level, you'll need a radon test kit.