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Radon Levels in Cumberland County, Tennessee

EPA puts Cumberland County in Zone 3, its lowest radon zone, and only 9 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

    8.7%

    24.6 pts below TN

    Cumberland
    8.7%
    Tennessee
    33.3%

    172 tests, 2008 to 2017

  • Median result

    1.3pCi/L

    Below action level

    Cumberland
    1.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    172

    30th of 80 by tests

    Cumberland
    172
    Davidson
    5,592

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 3

    Lower potential

    1. 1
    2. 2
    3. Zone 3

    1 highest, 3 lowest

    EPA predicts under 2 pCi/L indoors

  • Rank in Tennessee

    71 of 80

    Lowest quarter

    Cumberland
    8.7%
    Jefferson
    56.8%

    By share, of 80 with 30+ tests

Read a result for Cumberland County

Starts at Cumberland 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. Cumberland County's median reported result, 2008 to 2017.

Interpret this reading

The data

Cumberland County, At a glance

Cumberland County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Cumberland County as a whole is an average indoor of less than 2 pCi/L (less than 75 Bq/m³). A low zone clears no address in it: homes above EPA's turn up in all three zones.

USGS geologic potential: Low across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Cumberland County, 2023

Share of reported tests at or above 4 pCi/L, by year, Cumberland County
Share of reported tests at or above 4 pCi/L, by year, Cumberland County
YearShare of reported tests at or above 4 pCi/L
202221.7%
202322.2%

2023: 22.2%. Across these years the share ran from 21.7% to 22.2%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 9 tests were reported to CDC for Cumberland 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

Cumberland County, Compared

Cumberland County radon figures, compared

Calculated by Radon411

Cumberland County reports fewer high tests than Tennessee overall. 8.7% of its 172 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 24.6 points below the 33.3% pooled from 95 Tennessee counties.

The newest figure, in 2023, counts only 9 tests (22.2% at or above 4 pCi/L), too few to compare, so this reading uses the 172-test figure.

Ordered from highest share down, it comes 71st of 80 Tennessee counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 35.7%; Cumberland County sits 27.0 points below it.

Next door, the shares run from 6.5% in Morgan County to 49.0% in White County, with Morgan County below Cumberland County. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 8.7% share point the same way here.

Half the tests came in under 1.3 pCi/L and half over it; the single highest reached 13.6 pCi/L. The rest split 68.0% under 2 pCi/L and 23.3% from 2 to 4 (Tennessee: 42.4% and 24.3%).

The busiest year on file was 2022, with 69 tests reported; the quietest, 2023, had 9.

Cumberland County against Tennessee, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Cumberland County
Cumberland County1728.7%1.3 pCi/LThis county
Tennessee, pooled95 counties, pooled31,06633.3%Not pooled+24.6 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+27.0 points
Jefferson Countyhighest in the state14656.8%4.7 pCi/L+48.1 points
Chester Countylowest in the state440.0%1.1 pCi/L−8.7 points
White County, TNborders it14749.0%3.9 pCi/L+40.3 points
Van Buren County, TNborders it2240.9%2.1 pCi/L+32.2 points
Putnam County, TNborders it33636.0%2.6 pCi/L+27.3 points
Roane County, TNborders it25833.7%2.5 pCi/L+25.0 points
Rhea County, TNborders it4526.7%2.4 pCi/L+18.0 points
Bledsoe County, TNborders it3724.3%2.1 pCi/L+15.6 points
Fentress County, TNborders it339.1%1.3 pCi/L+0.4 points
Morgan County, TNborders it316.5%1.7 pCi/L−2.2 points
Where Cumberland County's reported results fell, 2008 to 2017, laboratory, beside Tennessee and the United States
ResultCumberland County testsCumberland County shareTennessee shareU.S. shareAgainst Tennessee
Under 2 pCi/L11768.0%42.4%39.6%+25.6 points
2 to 4 pCi/L4023.3%24.3%24.7%−1.0 points
4 pCi/L and above158.7%33.3%35.7%−24.6 points
Cumberland 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
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
Fentress County70 of 80339.1%1.3 pCi/L
Cumberland County71 of 801728.7%1.3 pCi/L
Madison County72 of 80928.7%1.2 pCi/L
McNairy County73 of 80598.5%1.0 pCi/L
Hardin County74 of 80387.9%1.0 pCi/L
Morgan County75 of 80316.5%1.7 pCi/L
Shelby County76 of 803846.3%1.0 pCi/L
Cumberland County radon tests by year, against Tennessee's pooled share
YearTestsAt or above 4 pCi/LMedianHighestTennessee, pooledChange from the row before
2023922.2%2.6 pCi/L7.7 pCi/L24.9%+0.5 points
20226921.7%1.3 pCi/L7.0 pCi/L23.8%First on file

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

Cumberland County, Geology

The ground under Cumberland County

Predicted

USGS's geologic map puts all of Cumberland County's mapped land in one class: low radon potential. All of it lies in the area the map calls Appalachian Plateau, to which USGS gives a radon index of 8, in the low band (5 to 8).

USGS's geologic areas under Cumberland County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Appalachian PlateauSandstone and shale.Low8100%

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

Cumberland County beside the ground around it

Across Tennessee 47.2% of the land is rated high; none of Cumberland County's is. Of the 8 counties that border it, 4 have more high-potential ground, Roane County the most at 97.3%.

Share of land by USGS radon potential: Cumberland County, the 8 counties bordering it and Tennessee
AreaEPA zoneLow potentialModerate potentialHigh potential
Cumberland CountyZone 3100%NoneNone
Morgan CountyZone 398.7%None1.3%
Rhea CountyZone 338.6%None61.4%
Roane CountyZone 12.7%None97.3%
White CountyZone 214.1%85.9%None
Fentress CountyZone 270.0%30.0%None
Putnam CountyZone 213.0%77.5%9.4%
Bledsoe CountyZone 3100%NoneNone
Van Buren CountyZone 262.4%37.6%None
Tennessee95 counties, pooled by land areaVaries30.5%22.3%47.2%

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

Local help

Cumberland County, Local resources

Radon testing and mitigation in Cumberland County

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

What it means

Cumberland County, Questions

Questions about radon in Cumberland County

Are radon levels high in Cumberland County?

In 2023, 22.2% of the radon tests reported to CDC for Cumberland County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.6 pCi/L. Of 80 Tennessee counties with 30 or more tests for the same period, 70 reported a higher share; pooled, the state comes to 33.3%.

Which counties border Cumberland County?

Cumberland County borders 8 counties: Morgan County, Rhea County, Roane County, White County, Fentress County, Putnam County, Bledsoe County and Van Buren County.

Products

Cumberland County, Products

Testing a home in Cumberland County

In Cumberland County, 8.7% of 172 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 33.3% pooled across Tennessee. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Cumberland County.

Test kits and monitors3

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Best radon monitors for Cumberland County homes, compared

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Cumberland County, Bordering counties

Counties bordering Cumberland County

Calculated by Radon411

Cumberland County, Cities and towns

Cities and towns in Cumberland County

Cumberland County is growing: the Census Bureau puts it at 66,300 residents on July 1, 2025, up 8.0% from 61,381 in 2020. That works out to 97 people per square mile of land. No town dominates: Crossville, the largest, has 13,113 residents, 19.8% of the total. Together its 3 incorporated places hold 21.7% of those residents; the other 78.3% live outside any of them. Reported testing is thin here: 172 tests over 2008 to 2017, or 2.6 for every 1,000 residents (2025 estimate), where Tennessee as a whole comes to 4.2.

From Crossville to Pleasant Hill, CDC publishes no figure by town: each reads Cumberland County's.

The cities and towns in Cumberland County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Crossville13,113+8.5%19.8%
Crab Orchard740+2.9%1.1%
Pleasant Hill542−0.4%0.8%

3 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).

Cumberland County, Homes

Homes in Cumberland County

Of Cumberland County's 31,037 homes, 74% are detached houses, against 68% across Tennessee; 14% are mobile homes. Half of its homes were built before 1993, close to Tennessee's 1986: 7% date from before 1960 and 35% from 2000 or later. Owners live in 80% of the occupied homes (Tennessee: 67%), so for most households a test and a fix are their own to order.

Homes in Cumberland County, Tennessee, 2019 to 2023
HomesCumberland CountyTennessee
Housing units31,0373,095,472
Detached houses74%68%
In buildings of 5 or more5%14%
Mobile homes14%8%
Built before 19607%18%
Built since 200035%29%
Middle year built19931986
Owner-occupied80%67%

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