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Radon Levels in Henry County, Georgia

EPA puts Henry County in Zone 2, its middle radon zone, and 22.7% of its 384 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

    22.7%

    2.1 pts below GA

    Henry
    22.7%
    Georgia
    24.8%

    384 tests, 2008 to 2017

  • Median result

    2.1pCi/L

    Below action level

    Henry
    2.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    384

    14th of 57 by tests

    Henry
    384
    Fulton
    4,858

    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 Georgia

    34 of 57

    Middle half

    Henry
    22.7%
    Barrow
    48.3%

    By share, of 57 with 30+ tests

Read a result for Henry County

Starts at Henry County's median, 2.1 pCi/L

2.1pCi/L

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

EPA’s reading of 2.1 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 100% 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: 46%2 to 4 pCi/L: 31%4 pCi/L and above: 23%

Of 384 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/L17946.6%
2 to 4 pCi/L11830.7%
4 pCi/L and above8722.7%
What these figures count

These are the 384 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 384 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.1 pCi/L and a maximum of 155.8 pCi/L, and 22.7% reached 4 pCi/L. Georgia as a whole (129 Georgia counties, pooled) comes to 24.8%: 2.1 points higher than here.

Among its state's counties it ranks 34th of 57 Georgia counties with 30 or more tests for the same period. Statewide for the same period, Barrow County reported the highest share (48.3%) and Richmond County the lowest (0.0%).

Below the action level, 179 tests (46.6%) came in under 2 pCi/L, against 44.0% statewide, and 118 tests (30.7%) fell between 2 and 4, against 31.2% statewide. CDC's ten-year totals for Henry County went from 366 tests (2005 to 2014) to 384 (2008 to 2017), the share going from 22.1% to 22.7%.

EPA's 1993 zone map puts Henry County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.

Next door, the shares run from 18.0% in DeKalb County to 33.6% in Spalding County, with Clayton County and DeKalb County below Henry County.

CDC also counts 9 tests taken after mitigation in Henry County for the same period: tests in homes where a fix was already in.

Henry County against Georgia, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Henry County
Henry County38422.7%2.1 pCi/LThis county
Georgia, pooled129 counties, pooled30,15224.8%Not pooled+2.1 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+13.0 points
Barrow Countyhighest in the state32148.3%3.8 pCi/L+25.6 points
Richmond Countylowest in the state320.0%1.4 pCi/L−22.7 points
Spalding County, GAborders it10733.6%2.9 pCi/L+10.9 points
Rockdale County, GAborders it24729.1%2.3 pCi/L+6.4 points
Newton County, GAborders it18625.8%2.1 pCi/L+3.1 points
Clayton County, GAborders it15420.1%1.6 pCi/L−2.6 points
DeKalb County, GAborders it3,47518.0%1.8 pCi/L−4.7 points
Butts County, GAborders it156.7%2.8 pCi/L−16.0 points
Where Henry County's reported results fell, 2008 to 2017, laboratory, beside Georgia and the United States
ResultHenry County testsHenry County shareGeorgia shareU.S. shareAgainst Georgia
Under 2 pCi/L17946.6%44.0%39.6%+2.6 points
2 to 4 pCi/L11830.7%31.2%24.7%−0.5 points
4 pCi/L and above8722.7%24.8%35.7%−2.1 points
Henry County ranked among the 57 Georgia counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Stephens County29 of 577925.3%2.2 pCi/L
White County30 of 579125.3%2.7 pCi/L
Bartow County31 of 5717724.9%2.2 pCi/L
Monroe County32 of 5724823.0%1.6 pCi/L
Walker County33 of 574422.7%1.6 pCi/L
Henry County34 of 5738422.7%2.1 pCi/L
Dawson County35 of 5714221.8%2.1 pCi/L
Fulton County36 of 574,85820.8%2.2 pCi/L
Whitfield County37 of 5710220.6%1.2 pCi/L
Clayton County38 of 5715420.1%1.6 pCi/L
Floyd County39 of 5711619.8%1.9 pCi/L
Henry County ten-year laboratory totals, against Georgia's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestGeorgia, pooledChange from the row before
2008 to 201738422.7%2.1 pCi/L155.8 pCi/L24.8%+1.2 points
2007 to 201639621.5%2.1 pCi/L155.8 pCi/L23.9%−0.6 points
2006 to 201538922.1%2.3 pCi/L155.8 pCi/L23.7%Level
2005 to 201436622.1%2.3 pCi/L155.8 pCi/L23.2%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 puts all of Henry County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Georgiabama Thrust Stack (South), to which USGS gives a radon index of 9, in the moderate band (9 to 11).

USGS's geologic areas under Henry County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Georgiabama Thrust Stack (South)Schist, amphibolite and granite.Moderate9100%

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

Henry County has more moderate-potential ground than Georgia as a whole: 100% of its land against 26.5%. Of the 6 counties that border it, none has as large a share of moderate-potential ground; Clayton County comes nearest at 100%.

Share of land by USGS radon potential: Henry County, the 6 counties bordering it and Georgia
AreaEPA zoneLow potentialModerate potentialHigh potential
Henry CountyZone 2None100%None
Butts CountyZone 20.6%99.4%None
Clayton CountyZone 2None100%None
Spalding CountyZone 2None100%None
Rockdale CountyZone 2None100%None
Newton CountyZone 2None100%None
DeKalb CountyZone 1None100%None
Georgia159 counties, pooled by land areaVaries73.1%26.5%None

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 Georgia's program says
Licensing of radon professionals
There are no laws mandating a mitigator receive certification in Georgia, however, many mitigators choose to get certified by one of two national programs.

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, 22.7% of the radon tests reported to CDC for Henry County, Georgia were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.1 pCi/L. Of 57 Georgia counties with 30 or more tests for the same period, 33 reported a higher share; pooled, the state comes to 24.8%.

Which counties border Henry County?

Henry County borders 6 counties: Butts County, Clayton County, Spalding County, Rockdale County, Newton County and DeKalb County.

Products

Henry County, Products

Testing a home in Henry County

In Henry County, 22.7% of 384 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 24.8% pooled across Georgia. 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

Henry County is growing: the Census Bureau puts it at 264,922 residents on July 1, 2025, up 9.5% from 241,869 in 2020. That works out to 831 people per square mile of land. No town dominates: Stockbridge, the largest, has 36,331 residents, 13.7% of the total. Together its 4 incorporated places hold 35.4% of those residents; the other 64.6% live outside any of them. Reported testing is thin here: 384 tests over 2008 to 2017, or 1.4 for every 1,000 residents (2025 estimate), where Georgia as a whole comes to 2.7.

From Stockbridge to Hampton, 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
Stockbridge36,331+2.0%13.7%
McDonough33,395+13.4%12.6%
Locust Grove14,610+26.7%5.5%
Hampton9,349+10.8%3.5%

4 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).

Henry County, Homes

Homes in Henry County

Henry County is a place of houses on their own lots: 82% of its 89,281 homes are detached single-family houses, against 66% across Georgia. Much of Henry County is recent building: 51% of its homes have gone up since 2000 and the middle year built is 2000, against 1991 for Georgia. 73% of occupied homes are lived in by their owner (Georgia: 65%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Henry County, Georgia, 2019 to 2023
HomesHenry CountyGeorgia
Housing units89,2814,483,873
Detached houses82%66%
In buildings of 5 or more10%16%
Mobile homes3%8%
Built before 19602%12%
Built since 200051%33%
Middle year built20001991
Owner-occupied73%65%

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