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Radon Levels in Henry County, Kentucky

EPA puts Henry County in Zone 2, its middle radon zone, and 36.6% of its 41 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

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  • Share at 4+ pCi/L

    36.6%

    7.1 pts below KY

    Henry
    36.6%
    Kentucky
    43.7%

    41 tests, 2008 to 2017

  • Median result

    3.2pCi/L

    Below action level

    Henry
    3.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    41

    58th of 69 by tests

    Henry
    41
    Jefferson
    6,590

    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 Kentucky

    34 of 69

    Middle half

    Henry
    36.6%
    Meade
    68.4%

    By share, of 69 with 30+ tests

Read a result for Henry County

Starts at Henry County's median, 3.2 pCi/L

3.2pCi/L

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

EPA’s reading of 3.2 pCi/L

Between 2 and 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 between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Henry County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Henry County, At a glance

Henry County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Henry 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 92% 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: 29%2 to 4 pCi/L: 34%4 pCi/L and above: 37%

Of 41 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/L1229.3%
2 to 4 pCi/L1434.1%
4 pCi/L and above1536.6%
What these figures count

These are the 41 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

In Henry County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (15 of 41) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 0.9 points higher. Across 120 Kentucky counties pooled together, 43.7% of tests reached that level, so Henry County runs 7.1 points below its state.

Of 4 neighbours with a figure, 3 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 36.2% (Owen County) to 43.1% (Franklin County). By share, Henry County is 34th of 69 Kentucky counties with 30 or more tests for the same period.

Half the tests came in under 3.2 pCi/L and half over it; the single highest reached 16.3 pCi/L. Below the action level, 12 tests (29.3%) came in under 2 pCi/L, against 33.2% statewide, and 14 tests (34.1%) fell between 2 and 4, against 23.1% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 36.6% share point the same way here. USGS geology rates 92% of the county's land moderate radon potential.

CDC's ten-year totals for Henry County went from 34 tests (2005 to 2014) to 41 (2008 to 2017), the share going from 35.3% to 36.6%.

Henry County against Kentucky, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Henry County
Henry County4136.6%3.2 pCi/LThis county
Kentucky, pooled120 counties, pooled28,79343.7%Not pooled+7.1 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−0.9 points
Meade Countyhighest in the state11768.4%8.2 pCi/L+31.8 points
Hopkins Countylowest in the state429.5%1.7 pCi/L−27.1 points
Trimble County, KYborders it2445.8%3.7 pCi/L+9.2 points
Franklin County, KYborders it81043.1%3.3 pCi/L+6.5 points
Carroll County, KYborders it2638.5%3.5 pCi/L+1.9 points
Shelby County, KYborders it40737.6%3.0 pCi/L+1.0 points
Oldham County, KYborders it80337.1%2.7 pCi/L+0.5 points
Owen County, KYborders it5836.2%2.5 pCi/L−0.4 points
Where Henry County's reported results fell, 2008 to 2017, laboratory, beside Kentucky and the United States
ResultHenry County testsHenry County shareKentucky shareU.S. shareAgainst Kentucky
Under 2 pCi/L1229.3%33.2%39.6%−3.9 points
2 to 4 pCi/L1434.1%23.1%24.7%+11.0 points
4 pCi/L and above1536.6%43.7%35.7%−7.1 points
Henry County ranked among the 69 Kentucky counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Jefferson County29 of 696,59039.4%2.7 pCi/L
Madison County30 of 6960438.7%2.9 pCi/L
Mercer County31 of 6928838.2%2.7 pCi/L
Shelby County32 of 6940737.6%3.0 pCi/L
Oldham County33 of 6980337.1%2.7 pCi/L
Henry County34 of 694136.6%3.2 pCi/L
Owen County35 of 695836.2%2.5 pCi/L
Christian County36 of 697236.1%3.2 pCi/L
Lincoln County37 of 6913535.6%2.8 pCi/L
Grant County38 of 697833.3%2.5 pCi/L
Casey County39 of 694332.6%3.1 pCi/L
Henry County ten-year laboratory totals, against Kentucky's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestKentucky, pooledChange from the row before
2008 to 20174136.6%3.2 pCi/L16.3 pCi/L43.7%+0.7 points
2007 to 20163935.9%3.3 pCi/L16.3 pCi/L45.1%−1.9 points
2006 to 20153737.8%3.4 pCi/L16.3 pCi/L46.4%+2.5 points
2005 to 20143435.3%3.3 pCi/L16.3 pCi/L47.3%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

Most of the ground under Henry County is one class on USGS's geologic map: 92.0% of its land is moderate radon potential, with 8.0% high. The map puts 92.0% of Henry County in the area it calls Outer Bluegrass and 8.0% in Inner Bluegrass. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 13, in the high band (12 to 17).

USGS's geologic areas under Henry County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Outer BluegrassOrdovician-Devonian limestone and shale.Moderate1192.0%
Inner BluegrassOrdovician limestones, dolomites and shales.High138.0%

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

Kentucky as a whole has more high-potential ground than Henry County: 18.2% of its land, against 8.0% here. Of the 6 counties that border it, 2 have more high-potential ground, Franklin County the most at 66.8%.

Share of land by USGS radon potential: Henry County, the 6 counties bordering it and Kentucky
AreaEPA zoneLow potentialModerate potentialHigh potential
Henry CountyZone 2None92.0%8.0%
Trimble CountyZone 2None100%None
Carroll CountyZone 2None100%None
Owen CountyZone 2None98.1%1.9%
Shelby CountyZone 2None100%None
Oldham CountyZone 2None48.3%51.7%
Franklin CountyZone 1None33.2%66.8%
Kentucky120 counties, pooled by land areaVaries5.7%76.1%18.2%

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 Kentucky's program says
Phone
502-782-2782
Email
Radon@ky.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, 36.6% of the radon tests reported to CDC for Henry County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.2 pCi/L. Of 69 Kentucky counties with 30 or more tests for the same period, 33 reported a higher share; pooled, the state comes to 43.7%.

Which counties border Henry County?

Henry County borders 6 counties: Trimble County, Carroll County, Owen County, Shelby County, Oldham County and Franklin County.

Products

Henry County, Products

Testing a home in Henry County

In Henry County, 36.6% of 41 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 43.7% pooled across Kentucky. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Henry County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Henry County homes, compared

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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 16,447 residents in Henry County for July 1, 2025, 754 more than in 2020 (+4.8%). That works out to 57 people per square mile of land. No town dominates: Eminence, the largest, has 2,823 residents, 17.2% of the total. Reported testing is thin here: 41 tests over 2008 to 2017, or 2.5 for every 1,000 residents (2025 estimate), where Kentucky as a whole comes to 6.3.

From Eminence to Smithfield, 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
Eminence2,823+4.2%17.2%
New Castle909+3.5%5.5%
Campbellsburg861+4.5%5.2%
Pleasurevilleextends beyond Henry County812+4.6%Counted whole
Smithfield131+6.5%0.8%

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

Henry County is a place of houses on their own lots: 82% of its 6,678 homes are detached single-family houses, against 68% across Kentucky. Half of its homes were built before 1977, close to Kentucky's 1982: 28% date from before 1960 and 20% from 2000 or later. Owners live in 76% of the occupied homes (Kentucky: 68%), so for most households a test and a fix are their own to order.

Homes in Henry County, Kentucky, 2019 to 2023
HomesHenry CountyKentucky
Housing units6,6782,010,655
Detached houses82%68%
In buildings of 5 or more4%12%
Mobile homes10%11%
Built before 196028%22%
Built since 200020%24%
Middle year built19771982
Owner-occupied76%68%

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