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Radon Levels in Coffee County, Tennessee

EPA puts Coffee County in Zone 2, its middle radon zone, and only 2 radon tests from it are on file with CDC (2023). 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

    16.5%

    16.8 pts below TN

    Coffee
    16.5%
    Tennessee
    33.3%

    206 tests, 2008 to 2017

  • Median result

    1.3pCi/L

    Below action level

    Coffee
    1.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    206

    26th of 80 by tests

    Coffee
    206
    Davidson
    5,592

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in Tennessee

    64 of 80

    Lowest quarter

    Coffee
    16.5%
    Jefferson
    56.8%

    By share, of 80 with 30+ tests

Read a result for Coffee County

Starts at Coffee County's median, 1.3 pCi/L

1.3pCi/L

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

EPA’s reading of 1.3 pCi/L

Below 2 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 below 2 pCi/L, the level at which EPA says a fix should be considered. Coffee County's median reported result, 2008 to 2017.

Interpret this reading

The data

Coffee County, At a glance

Coffee County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Coffee County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

USGS geologic potential: Moderate across 88% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Coffee County, 2023

Share of reported tests at or above 4 pCi/L, by year, Coffee County
Share of reported tests at or above 4 pCi/L, by year, Coffee County
YearShare of reported tests at or above 4 pCi/L
202210.0%
20230.0%

2023: 0.0%. Across these years the share ran from 0.0% to 10.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 2 tests were reported to CDC for Coffee County over 2023, and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.

Measured: CDC tracking data. Figure above: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).

How to read these figures

Coffee County, Compared

Coffee County radon figures, compared

Calculated by Radon411

Coffee County's 206 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.3 pCi/L and a maximum of 21.9 pCi/L, and 16.5% reached 4 pCi/L. Tennessee as a whole (95 Tennessee counties, pooled) comes to 33.3%: 16.8 points higher than here.

The newest figure, in 2023, counts only 2 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 206-test figure.

Among its state's counties it ranks 64th of 80 Tennessee counties with 30 or more tests for the same period. Statewide for the same period, Jefferson County reported the highest share (56.8%) and Chester County the lowest (0.0%).

Below the action level, 136 tests (66.0%) came in under 2 pCi/L, against 42.4% statewide, and 36 tests (17.5%) fell between 2 and 4, against 24.3% statewide. The busiest year on file was 2022, with 30 tests reported; the quietest, 2023, had 2.

EPA's 1993 zone map puts Coffee County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 88% of the county's land moderate radon potential.

Next door, the shares run from 10.7% in Cannon County to 36.9% in Warren County, with Rutherford County and Cannon County below Coffee County.

CDC also counts 6 tests taken after mitigation in Coffee County for the same period: tests in homes where a fix was already in.

Coffee County against Tennessee, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Coffee County
Coffee County20616.5%1.3 pCi/LThis county
Tennessee, pooled95 counties, pooled31,06633.3%Not pooled+16.8 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+19.2 points
Jefferson Countyhighest in the state14656.8%4.7 pCi/L+40.3 points
Chester Countylowest in the state440.0%1.1 pCi/L−16.5 points
Warren County, TNborders it14936.9%3.0 pCi/L+20.4 points
Moore County, TNborders it5135.3%2.9 pCi/L+18.8 points
Franklin County, TNborders it26625.6%2.1 pCi/L+9.1 points
Bedford County, TNborders it12421.0%1.8 pCi/L+4.5 points
Rutherford County, TNborders it1,20015.3%1.5 pCi/L−1.2 points
Cannon County, TNborders it5610.7%1.3 pCi/L−5.8 points
Grundy County, TNborders it290.0%1.0 pCi/L−16.5 points
Where Coffee County's reported results fell, 2008 to 2017, laboratory, beside Tennessee and the United States
ResultCoffee County testsCoffee County shareTennessee shareU.S. shareAgainst Tennessee
Under 2 pCi/L13666.0%42.4%39.6%+23.6 points
2 to 4 pCi/L3617.5%24.3%24.7%−6.8 points
4 pCi/L and above3416.5%33.3%35.7%−16.8 points
Coffee County ranked among the 80 Tennessee counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Macon County59 of 806719.4%1.9 pCi/L
Hamilton County60 of 801,14819.3%1.7 pCi/L
Marshall County61 of 8013818.1%1.6 pCi/L
Henry County62 of 806016.7%1.6 pCi/L
Henderson County62 of 803016.7%1.6 pCi/L
Coffee County64 of 8020616.5%1.3 pCi/L
Lewis County65 of 805616.1%1.4 pCi/L
Rutherford County66 of 801,20015.3%1.5 pCi/L
Fayette County67 of 809911.1%1.1 pCi/L
Obion County67 of 803611.1%1.8 pCi/L
Cannon County69 of 805610.7%1.3 pCi/L
Coffee County radon tests by year, against Tennessee's pooled share
YearTestsAt or above 4 pCi/LMedianHighestTennessee, pooledChange from the row before
202320.0%1.5 pCi/L1.7 pCi/L24.9%−10.0 points
20223010.0%0.6 pCi/L7.2 pCi/L23.8%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Coffee County, Geology

The ground under Coffee County

Predicted

Most of the ground under Coffee County is one class on USGS's geologic map: 87.8% of its land is moderate radon potential, with 12.2% high. The map puts 87.8% of Coffee County in the area it calls Highland Rim and 12.2% in Nashville Basin. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 14, in the high band (12 to 17).

USGS's geologic areas under Coffee County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Highland RimPaleozoic sedimentary rocks (limestone, shale, chert, and dolostone).Moderate1187.8%
Nashville BasinMississippian Limestone.High1412.2%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Coffee County beside the ground around it

Tennessee as a whole has more high-potential ground than Coffee County: 47.2% of its land, against 12.2% here. Of the 7 counties that border it, 4 have more high-potential ground, Rutherford County the most at 100%.

Share of land by USGS radon potential: Coffee County, the 7 counties bordering it and Tennessee
AreaEPA zoneLow potentialModerate potentialHigh potential
Coffee CountyZone 2None87.8%12.2%
Franklin CountyZone 38.2%86.0%5.8%
Warren CountyZone 24.7%95.3%None
Moore CountyZone 1None29.0%71.0%
Cannon CountyZone 2None42.6%57.4%
Grundy CountyZone 369.0%30.2%0.8%
Bedford CountyZone 1None2.2%97.8%
Rutherford CountyZone 1NoneNone100%
Tennessee95 counties, pooled by land areaVaries30.5%22.3%47.2%

The map rates the ground, not the air in any home.

Local help

Coffee County, Local resources

Radon testing and mitigation in Coffee County

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

What it means

Coffee County, Questions

Questions about radon in Coffee County

Are radon levels high in Coffee County?

In 2023, 0.0% of the radon tests reported to CDC for Coffee County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.5 pCi/L. Of 80 Tennessee counties with 30 or more tests for the same period, 63 reported a higher share; pooled, the state comes to 33.3%.

Which counties border Coffee County?

Coffee County borders 7 counties: Franklin County, Warren County, Moore County, Cannon County, Grundy County, Bedford County and Rutherford County.

Products

Coffee County, Products

Testing a home in Coffee County

In Coffee County, 16.5% of 206 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 33.3% pooled across Tennessee. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Coffee County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Coffee County homes, compared

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Coffee County, Bordering counties

Counties bordering Coffee County

Calculated by Radon411

Coffee County, Cities and towns

Cities and towns in Coffee County

Coffee County is growing: the Census Bureau puts it at 62,419 residents on July 1, 2025, up 7.4% from 58,132 in 2020. That works out to 146 people per square mile of land. Tullahoma, the largest place on its list (21,279 residents in all), extends beyond Coffee County, so no share of the total is worked out for it. CDC's 206 reported tests for 2008 to 2017 work out to 3.3 per 1,000 residents (2025 estimate), close to Tennessee's 4.2.

From Tullahoma to Manchester, CDC publishes no figure by town: each reads Coffee County's.

The cities and towns in Coffee County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Tullahomaextends beyond Coffee County21,279+4.3%Counted whole
Manchester13,776+12.3%22.1%

2 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Coffee County is counted whole, so it has no share.

Coffee County, Homes

Homes in Coffee County

Of Coffee County's 25,187 homes, 72% are detached houses, against 68% across Tennessee; 13% are mobile homes. Half of its homes were built before 1986, close to Tennessee's 1986: 15% date from before 1960 and 26% from 2000 or later. 70% of occupied homes are lived in by their owner (Tennessee: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Coffee County, Tennessee, 2019 to 2023
HomesCoffee CountyTennessee
Housing units25,1873,095,472
Detached houses72%68%
In buildings of 5 or more8%14%
Mobile homes13%8%
Built before 196015%18%
Built since 200026%29%
Middle year built19861986
Owner-occupied70%67%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.