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Tennessee Radon Map and Levels by County

Tennessee's counties span all three EPA radon zones. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Share at 4+ pCi/L

    33.3%

    2.5 pts below U.S.

    Tennessee
    33.3%
    U.S.
    35.7%

    31,066 tests across 95 counties, 2008 to 2017

  • Rank among states

    20 of 47

    Middle of the states

    Tennessee
    33.3%
    North Dakota
    59.3%

    By share, every state pooled the same way, 2008 to 2017

  • Counties in EPA Zone 1

    39 of 95

    Some at highest potential

    Zone 1
    39
    Zone 2
    32

    Most counties sit in Zone 1; Zone 1 is the highest potential

  • Highest county

    56.8%

    Jefferson County

    Jefferson
    56.8%
    Chester
    0.0%

    Counties with 30+ tests, 2008 to 2017

Read a result for Tennessee

Starts at EPA's action level

4.0pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 4.0 pCi/L

At or above 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. 33.3% of Tennessee's reported tests reached 4 pCi/L, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Tennessee, At a glance

Tennessee at a glance

Predicted: EPA radon zone

95 of 95 counties classified

EPA classifies counties, not states. Of the 95 counties in Tennessee with a zone, 39 are in Zone 1, 32 in Zone 2 and 24 in Zone 3.

  • Zone 1: Highest predicted potentialgreater than 4 pCi/L39 of 95 counties · 41.1%
  • Zone 2: Moderate predicted potential2 to 4 pCi/L32 of 95 counties · 33.7%
  • Zone 3: Lower predicted potentialless than 2 pCi/L24 of 95 counties · 25.3%

An EPA radon zone predicts a whole county. It is not intended to determine whether any individual home should be tested: homes with elevated levels occur in all three zones, and EPA recommends testing every home regardless of zone.

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

CDC test figures, county by county

CDC publishes Tennessee's radon test figures by county: 95 of its 95 counties have one. Each one's share is in the county list.

How to read these figures

Tennessee, Compared

Tennessee radon figures, compared

Calculated by Radon411
Tennessee, 2008 to 2017, laboratory
33.3%
of 31,066 tests at or above 4 pCi/L, pooled
Against the U.S.
−2.5points
35.7% pooled
Rank among the states
20 of 47
1 is the highest share
Counties with 30 or more tests
80
Highest
56.8%
Jefferson County
Lowest
0.0%
Chester County

Tennessee pools to 33.3%: that share of 31,066 reported tests from 95 counties over the 2008 to 2017 laboratory totals reached EPA's action level. Nationally the pooled share is 35.7%: 2.5 points higher than here.

Among 47 states pooled the same way it ranks 20th, with New Hampshire (35.0%) above it and Missouri (30.6%) below. Jefferson County reports the highest share (56.8% of 146 tests) and Chester County the lowest (0.0%); the most tests came from Davidson County, 5,592 of them at 36.4%.

Across its 4 overlapping ten-year totals, the share went from 33.2% (2005 to 2014) to 33.3% (2008 to 2017), within 2 points, with 2007 to 2016 the highest at 33.4%. By band, 5 counties at 50% or more, 35 counties at 30% to 50%, 26 counties at 15% to 30%, 11 counties at 5% to 15%, 3 counties at under 5%.

EPA's 1993 map puts 39 of its 95 classified counties in Zone 1; against that, 33.3% of the tests reported since reached 4 pCi/L.

Tennessee ranked among 47 states by pooled share of tests at or above 4 pCi/L, 2008 to 2017, laboratory
StateRankCountiesTestsAt or above 4 pCi/L
Idaho15 of 474412,96141.5%
Indiana16 of 479243,14838.9%
Maine17 of 471611,82537.6%
West Virginia18 of 475510,06137.5%
New Hampshire19 of 471015,60835.0%
Tennessee20 of 479531,06633.3%
Missouri21 of 4711558,52530.6%
Virginia22 of 4713153,19930.4%
New Mexico23 of 47293,72128.5%
Michigan24 of 4783114,40726.9%
Connecticut25 of 47825,57226.5%
Tennessee's highest and lowest counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/L
Jefferson County1 of 8014656.8%
Loudon County2 of 8085954.5%
Campbell County3 of 807153.5%
Sevier County4 of 8032853.0%
Sullivan County5 of 801,79951.5%
Washington County6 of 801,59049.6%
White County7 of 8014749.0%
Anderson County8 of 8026948.3%
Grainger County9 of 805648.2%
Carter County10 of 8034547.2%
Chester County80 of 80440.0%
Scott County79 of 80392.6%
Tipton County78 of 80884.5%
Gibson County77 of 80575.3%
Shelby County76 of 803846.3%
Tennessee's counties with 30 or more tests, by their own share at or above 4 pCi/L, 2008 to 2017, laboratory
ShareCountiesTheir testsFor example
50% or more53,203Jefferson County, Loudon County, Campbell County
30% to 50%3515,689Washington County, White County, Anderson County
15% to 30%2610,661Robertson County, Marion County, Polk County
5% to 15%111,057Fayette County, Obion County, Cannon County
Under 5%3171Tipton County, Scott County, Chester County
Tennessee ten-year laboratory totals, pooled, against the United States
PeriodCountiesTestsAt or above 4 pCi/LUnited StatesChange from the row before
2008 to 20179531,06633.3%35.7%−0.2 points
2007 to 20169528,89833.4%35.8%+0.1 points
2006 to 20159525,53033.4%36.3%+0.2 points
2005 to 20149523,04133.2%36.0%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period. CDC publishes no state or national figure.

Tennessee, Counties

Tennessee counties by EPA zone

Predicted

Tennessee's radon map, then all 95 counties by EPA's zone, the highest reported share of tests at or above 4 pCi/L first; each has its own report.

Tennessee radon map by county: EPA radon zones. Map of Tennessee's 95 counties shaded by EPA radon zone: Zone 1 in red-orange, Zone 2 in amber, Zone 3 in pale sand. 39 in Zone 1, 32 in Zone 2, 24 in Zone 3.
Tennessee radon map by countyEPA radon zones for Tennessee's counties: 39 counties in Zone 1, 32 counties in Zone 2, 24 counties in Zone 3.A prediction for each county, not a reading of any home; elevated homes occur in all three zones.

The 12 highest in Tennessee, 2008 to 2017

Zone 1: highest predicted potential39

Local help

Tennessee, Local resources

Local resources in Tennessee

Who to ask in Tennessee: its radon program, test kits and professionals.

What Tennessee's program says
Phone
1-800-232-1139
Email
TDEC.Radon@tn.gov

What it means

Tennessee, Questions

Questions about radon in Tennessee

Is radon a problem in Tennessee?

EPA's Map of Radon Zones places 39 of the 95 Tennessee counties it classifies in Zone 1, the highest predicted potential, 32 in Zone 2 and 24 in Zone 3. Pooled from 95 counties, 33.3% of the 31,066 radon tests reported to CDC over the 2008 to 2017 laboratory totals were at or above 4 pCi/L, 20th of 47 states.

Which Tennessee counties are in EPA radon Zone 1?

Zone 1 holds 39 counties in Tennessee; the first 8 by name are Anderson County, Bedford County, Blount County, Bradley County, Claiborne County, Davidson County, Giles County, Grainger County, the rest in the county table on this page.

Who does radon mitigation in Tennessee?

1 radon business is listed for Tennessee, for testing, mitigation or both; each listing names the licensing list it was read from.

Which Tennessee counties have the highest radon?

Jefferson County 56.8% (146 tests) leads Tennessee by the share of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory, then Loudon County 54.5% (859 tests), Campbell County 53.5% (71 tests), Sevier County 53.0% (328 tests), Sullivan County 51.5% (1,799 tests).

Which EPA region is Tennessee in?

Tennessee is in EPA Region 4: Southeast.

Products

Tennessee, Products

Testing a home in Tennessee

33.3% of the 31,066 tests reported to CDC for Tennessee over the 2008 to 2017 laboratory totals reached 4 pCi/L: a short-term kit (2 to 90 days) gives a first answer in days, a long-term test the year-round average. A short-term kit (2 to 90 days) is the quick first check for a home in Tennessee; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Tennessee homes, compared

Explore

Cities in Tennessee with their own page

Radon data is published by county, not by city. Each city page sets the figures of the counties the city lies in side by side.