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Radon Levels in Henry County, Virginia

EPA puts Henry County in Zone 1, its highest radon zone, and 35.7% of its 115 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

    35.7%

    5.3 pts above VA

    Henry
    35.7%
    Virginia
    30.4%

    115 tests, 2008 to 2017

  • Median result

    2.7pCi/L

    Below action level

    Henry
    2.7 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    115

    56th of 84 by tests

    Henry
    115
    Fairfax
    8,657

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Virginia

    41 of 84

    Middle half

    Henry
    35.7%
    Russell
    67.3%

    By share, of 84 with 30+ tests

Read a result for Henry County

Starts at Henry County's median, 2.7 pCi/L

2.7pCi/L

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

EPA’s reading of 2.7 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 1: highest predicted potential

EPA puts all of Henry County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 98% 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: 34%2 to 4 pCi/L: 30%4 pCi/L and above: 36%

Of 115 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/L3933.9%
2 to 4 pCi/L3530.4%
4 pCi/L and above4135.7%
What these figures count

These are the 115 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 (41 of 115) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 0.0 points lower. Across 131 Virginia counties pooled together, 30.4% of tests reached that level, so Henry County runs 5.3 points above its state.

Of 6 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 21.2% (Franklin County) to 54.7% (Patrick County). By share, Henry County is 41st of 84 Virginia counties with 30 or more tests for the same period.

Half the tests came in under 2.7 pCi/L and half over it; the single highest reached 22.9 pCi/L. Below the action level, 39 tests (33.9%) came in under 2 pCi/L, against 44.7% statewide, and 35 tests (30.4%) fell between 2 and 4, against 24.9% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 35.7% share point the same way here. USGS geology rates 98% of the county's land high radon potential.

CDC's ten-year totals for Henry County went from 115 tests (2005 to 2014) to 115 (2008 to 2017), the share going from 32.2% to 35.7%.

Henry County against Virginia, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Henry County
Henry County11535.7%2.7 pCi/LThis county
Virginia, pooled131 counties, pooled53,19930.4%Not pooled−5.3 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooledLevel
Russell Countyhighest in the state4967.3%6.7 pCi/L+31.6 points
Norfolk citylowest in the state732.7%0.5 pCi/L−33.0 points
Patrick County, VAborders it5354.7%5.3 pCi/L+19.0 points
Pittsylvania County, VAborders it24238.4%3.0 pCi/L+2.7 points
Rockingham County, NCborders it83527.3%2.1 pCi/L−8.4 points
Martinsville city, VAborders it3327.3%1.8 pCi/L−8.4 points
Stokes County, NCborders it59221.6%1.8 pCi/L−14.1 points
Franklin County, VAborders it57221.2%2.0 pCi/L−14.5 points
Where Henry County's reported results fell, 2008 to 2017, laboratory, beside Virginia and the United States
ResultHenry County testsHenry County shareVirginia shareU.S. shareAgainst Virginia
Under 2 pCi/L3933.9%44.7%39.6%−10.8 points
2 to 4 pCi/L3530.4%24.9%24.7%+5.5 points
4 pCi/L and above4135.7%30.4%35.7%+5.3 points
Henry County ranked among the 84 Virginia counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
James City County36 of 848337.3%2.6 pCi/L
Warren County37 of 8453636.9%2.7 pCi/L
Amherst County38 of 8424736.8%2.9 pCi/L
Shenandoah County39 of 8439036.4%2.7 pCi/L
Orange County40 of 8446236.1%2.8 pCi/L
Henry County41 of 8411535.7%2.7 pCi/L
Montgomery County42 of 8497035.5%2.5 pCi/L
Danville city43 of 847735.1%3.0 pCi/L
Greene County44 of 8421434.6%2.8 pCi/L
Spotsylvania County45 of 841,87234.2%2.7 pCi/L
Salem city46 of 8428633.6%2.8 pCi/L
Henry County ten-year laboratory totals, against Virginia's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestVirginia, pooledChange from the row before
2008 to 201711535.7%2.7 pCi/L22.9 pCi/L30.4%−1.5 points
2007 to 201611337.2%2.8 pCi/L22.9 pCi/L30.6%−2.5 points
2006 to 201511639.7%3.0 pCi/L22.9 pCi/L30.7%+7.5 points
2005 to 201411532.2%2.5 pCi/L22.9 pCi/L30.3%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: 97.9% of its land is high radon potential, with 2.1% moderate. 97.9% of it lies in the area the map calls Inner Piedmont, to which USGS gives a radon index of 12, in the high band (12 to 17).

USGS's geologic areas under Henry County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Inner PiedmontGranite, pegmatites, granitic gneiss, schist and gneiss, slate, and phyllite.High1297.9%
Mesozoic BasinsSandstone, siltstone and lacustrine black shale.Moderate111.8%

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 high-potential ground than Virginia as a whole: 97.9% of its land against 47.9%. Of the 6 counties that border it, 1 has more high-potential ground, Martinsville city the most at 100%.

Share of land by USGS radon potential: Henry County, the 6 counties bordering it and Virginia
AreaEPA zoneLow potentialModerate potentialHigh potential
Henry CountyZone 1None2.1%97.9%
Martinsville cityZone 3NoneNone100%
Patrick CountyZone 1None55.7%44.3%
Franklin CountyZone 2None77.0%23.0%
Rockingham County, NCZone 119.2%80.7%None
Stokes County, NCZone 210.3%89.7%0.1%
Pittsylvania CountyZone 1None47.7%52.3%
Virginia133 counties, pooled by land areaVaries20.6%30.0%47.9%

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 Virginia's program says
Phone
(804) 864-8161
Email
Radon@vdh.virginia.gov
Licensing of radon professionals
The Code of Virginia requires that Radon testers and mitigators be currently certified by either the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB).

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, 35.7% of the radon tests reported to CDC for Henry County, Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.7 pCi/L. Of 84 Virginia counties with 30 or more tests for the same period, 40 reported a higher share; pooled, the state comes to 30.4%.

Which counties border Henry County?

Henry County borders 6 counties: Martinsville city, VA, Patrick County, VA, Franklin County, VA, Rockingham County, NC, Stokes County, NC and Pittsylvania County, VA.

Products

Henry County, Products

Testing a home in Henry County

In Henry County, 35.7% of 115 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 30.4% pooled across Virginia. In Zone 1 the year-round level in Henry County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Henry County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Henry County

Explore

Henry County, Bordering counties

Counties bordering Henry County

Calculated by Radon411

Henry County, Cities and towns

Cities and towns in Henry County

About 49,242 people live in Henry County by the Census Bureau's estimate for July 1, 2025, 1,603 fewer than in 2020 (−3.2%). That works out to 129 people per square mile of land. Ridgeway, its one incorporated place, has 732 residents, 1.5% of the total. Reported testing is thin here: 115 tests over 2008 to 2017, or 2.3 for every 1,000 residents (2025 estimate), where Virginia as a whole comes to 6.0.

Ridgeway is the one incorporated place here; CDC publishes no figure by town, so it reads Henry County's.

Ridgeway, Henry County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Ridgeway732−2.9%1.5%

One incorporated place, 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

Of Henry County's 25,445 homes, 73% are detached houses, against 61% across Virginia; 18% are mobile homes. The homes are older than Virginia's as a whole: half were built before 1974 (1984 for Virginia), and 24% date from before 1960. Owners live in 76% of the occupied homes (Virginia: 67%), so for most households a test and a fix are their own to order.

Homes in Henry County, Virginia, 2019 to 2023
HomesHenry CountyVirginia
Housing units25,4453,654,784
Detached houses73%61%
In buildings of 5 or more5%19%
Mobile homes18%4%
Built before 196024%19%
Built since 20009%25%
Middle year built19741984
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.