Skip to content
RADON411

Locations and reports

Radon Levels in Henry County, Tennessee

EPA puts Henry County in Zone 3, its lowest radon zone, and 16.7% of its 60 reported radon tests (2008 to 2017, laboratory totals) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    16.7%

    16.6 pts below TN

    Henry
    16.7%
    Tennessee
    33.3%

    60 tests, 2008 to 2017

  • Median result

    1.6pCi/L

    Below action level

    Henry
    1.6 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    60

    53rd of 80 by tests

    Henry
    60
    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

    62 of 80

    Lowest quarter

    Henry
    16.7%
    Jefferson
    56.8%

    By share, of 80 with 30+ tests

Read a result for Henry County

Starts at Henry County's median, 1.6 pCi/L

1.6pCi/L

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

EPA’s reading of 1.6 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. Henry County's median reported result, 2008 to 2017.

Interpret this reading

The data

Henry County, At a glance

Henry County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Henry 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 61% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Henry County, 2008 to 2017, laboratory

Reported results by concentration band, Henry County, 2008 to 2017, laboratory
Under 2 pCi/L: 55%2 to 4 pCi/L: 28%4 pCi/L and above: 17%

Of 60 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Henry County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L3355.0%
2 to 4 pCi/L1728.3%
4 pCi/L and above1016.7%
What these figures count

These are the 60 tests reported to CDC for Henry County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.

Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Henry County, Compared

Henry County radon figures, compared

Calculated by Radon411

Henry County's 60 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.6 pCi/L and a maximum of 12.1 pCi/L, and 16.7% reached 4 pCi/L. Tennessee as a whole (95 Tennessee counties, pooled) comes to 33.3%: 16.6 points higher than here.

Among its state's counties it ranks 62nd 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, 33 tests (55.0%) came in under 2 pCi/L, against 42.4% statewide, and 17 tests (28.3%) fell between 2 and 4, against 24.3% statewide. CDC's ten-year totals for Henry County went from 45 tests (2005 to 2014) to 60 (2008 to 2017), the share going from 8.9% to 16.7%.

EPA's 1993 zone map puts Henry County in Zone 3, a predicted county average under 2 pCi/L. USGS geology rates 61% of the county's land low radon potential.

Next door, the shares run from 26.3% in Stewart County to 33.3% in Benton County.

Henry County against Tennessee, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Henry County
Henry County6016.7%1.6 pCi/LThis county
Tennessee, pooled95 counties, pooled31,06633.3%Not pooled+16.6 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+19.0 points
Jefferson Countyhighest in the state14656.8%4.7 pCi/L+40.1 points
Chester Countylowest in the state440.0%1.1 pCi/L−16.7 points
Benton County, TNborders it3033.3%2.0 pCi/L+16.6 points
Stewart County, TNborders it9526.3%2.1 pCi/L+9.6 points
Calloway County, KYborders it2722.2%2.4 pCi/L+5.5 points
Carroll County, TNborders it2520.0%1.0 pCi/L+3.3 points
Weakley County, TNborders it1612.5%1.1 pCi/L−4.2 points
Graves County, KYborders it248.3%1.5 pCi/L−8.4 points
Where Henry County's reported results fell, 2008 to 2017, laboratory, beside Tennessee and the United States
ResultHenry County testsHenry County shareTennessee shareU.S. shareAgainst Tennessee
Under 2 pCi/L3355.0%42.4%39.6%+12.6 points
2 to 4 pCi/L1728.3%24.3%24.7%+4.0 points
4 pCi/L and above1016.7%33.3%35.7%−16.6 points
Henry 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
Sequatchie County57 of 805820.7%1.9 pCi/L
Wilson County58 of 8095920.2%1.7 pCi/L
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
Henry County ten-year laboratory totals, against Tennessee's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestTennessee, pooledChange from the row before
2008 to 20176016.7%1.6 pCi/L12.1 pCi/L33.3%−0.5 points
2007 to 20165817.2%1.7 pCi/L12.1 pCi/L33.4%+0.5 points
2006 to 20154816.7%1.9 pCi/L12.1 pCi/L33.4%+7.8 points
2005 to 2014458.9%1.8 pCi/L10.5 pCi/L33.2%First on file

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

Henry County, Geology

The ground under Henry County

Predicted

USGS's geologic map splits Henry County: 61.5% of its land is low radon potential and 8.1% high and 30.4% moderate. The map puts 61.5% of Henry County in the area it calls Loess-Covered Coastal Plain and 30.2% in East Coastal Plain, with one smaller area beside them. USGS gives the first a radon index of 8, in the low band (5 to 8), and the second 9, in the moderate band (9 to 11).

USGS's geologic areas under Henry County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Loess-Covered Coastal PlainCretaceous and younger marine and fluvial sand, clay, and marl covered with loess.Low861.5%
East Coastal PlainCretaceous and younger marine and fluvial sand, clay, and marl.Moderate930.2%
Cherty HighlandCherty dolostone.High128.1%

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

Henry County beside the ground around it

Tennessee as a whole has more high-potential ground than Henry County: 47.2% of its land, against 8.1% here. Of the 6 counties that border it, 2 have more high-potential ground, Benton County the most at 65.8%.

Share of land by USGS radon potential: Henry County, the 6 counties bordering it and Tennessee
AreaEPA zoneLow potentialModerate potentialHigh potential
Henry CountyZone 361.5%30.4%8.1%
Calloway County, KYZone 378.2%19.6%2.2%
Benton CountyZone 2None34.2%65.8%
Weakley CountyZone 3100%NoneNone
Carroll CountyZone 374.9%25.1%None
Graves County, KYZone 3100%NoneNone
Stewart CountyZone 2None82.7%17.3%
Tennessee95 counties, pooled by land areaVaries30.5%22.3%47.2%

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

Local help

Henry County, Local resources

Radon testing and mitigation in Henry County

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

What it means

Henry County, Questions

Questions about radon in Henry County

Are radon levels high in Henry County?

Over the 2008 to 2017 laboratory totals, 16.7% of the radon tests reported to CDC for Henry County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.6 pCi/L. Of 80 Tennessee counties with 30 or more tests for the same period, 61 reported a higher share; pooled, the state comes to 33.3%.

Which counties border Henry County?

Henry County borders 6 counties: Calloway County, KY, Benton County, TN, Weakley County, TN, Carroll County, TN, Graves County, KY and Stewart County, TN.

Products

Henry County, Products

Testing a home in Henry County

In Henry County, 16.7% of 60 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 Henry County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Henry County homes, compared

Explore

Henry County, Bordering counties

Counties bordering Henry County

Calculated by Radon411

Henry County, Cities and towns

Cities and towns in Henry County

The Census Bureau estimates 32,896 residents in Henry County for July 1, 2025, 747 more than in 2020 (+2.3%). That works out to 59 people per square mile of land. Its largest town, Paris, has 10,468 residents, 31.8% of the total. Reported testing is thin here: 60 tests over 2008 to 2017, or 1.8 for every 1,000 residents (2025 estimate), where Tennessee as a whole comes to 4.2.

From Paris to Cottage Grove, CDC publishes no figure by town: each reads Henry County's.

The cities and towns in Henry County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Paris10,468+1.7%31.8%
McKenzieextends beyond Henry County5,632+1.9%Counted whole
Puryear719+2.1%2.2%
Henry457+3.4%1.4%
Cottage Grove66Level0.2%

5 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 Henry County is counted whole, so it has no share.

Henry County, Homes

Homes in Henry County

Of Henry County's 17,044 homes, 63% are detached houses, against 68% across Tennessee; 27% are mobile homes. Half of its homes were built before 1983, close to Tennessee's 1986: 20% date from before 1960 and 24% from 2000 or later. Owners live in 76% of the occupied homes (Tennessee: 67%), so for most households a test and a fix are their own to order.

Homes in Henry County, Tennessee, 2019 to 2023
HomesHenry CountyTennessee
Housing units17,0443,095,472
Detached houses63%68%
In buildings of 5 or more5%14%
Mobile homes27%8%
Built before 196020%18%
Built since 200024%29%
Middle year built19831986
Owner-occupied76%67%

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