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Radon Levels in Rockingham County, North Carolina

EPA puts Rockingham County in Zone 1, its highest radon zone, and only 3 radon tests from it are on file with CDC (2022). 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

    27.3%

    4.7 pts above NC

    Rockingham
    27.3%
    NC
    22.6%

    835 tests, 2008 to 2017

  • Median result

    2.1pCi/L

    Below action level

    Rockingham
    2.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    835

    23rd of 75 by tests

    Rockingham
    835
    Wake
    9,694

    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 NC

    30 of 75

    Middle half

    Rockingham
    27.3%
    Transylvania
    47.8%

    By share, of 75 with 30+ tests

Read a result for Rockingham County

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

Interpret this readingWhat a fix costs

The data

Rockingham County, At a glance

Rockingham County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Rockingham 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: Moderate across 81% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Rockingham County, 2022

Share of reported tests at or above 4 pCi/L, by year, Rockingham County
Share of reported tests at or above 4 pCi/L, by year, Rockingham County
YearShare of reported tests at or above 4 pCi/L
201425.0%
202026.0%
202122.7%
202233.3%

2022: 33.3%. Across these years the share ran from 22.7% to 33.3%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 3 tests were reported to CDC for Rockingham County over 2022, 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: 2022. Measured data period: 2005 to 2022 (every CDC figure on file).

How to read these figures

Rockingham County, Compared

Rockingham County radon figures, compared

Calculated by Radon411

Rockingham County's 835 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.1 pCi/L and a maximum of 61.3 pCi/L, and 27.3% reached 4 pCi/L. North Carolina as a whole (99 North Carolina counties, pooled) comes to 22.6%: 4.7 points lower than here.

The newest figure, in 2022, counts only 3 tests (33.3% at or above 4 pCi/L), too few to compare, so this reading uses the 835-test figure.

Among its state's counties it ranks 30th of 75 North Carolina counties with 30 or more tests for the same period. Statewide for the same period, Transylvania County reported the highest share (47.8%) and Nash County the lowest (0.0%).

Below the action level, 376 tests (45.0%) came in under 2 pCi/L, against 55.6% statewide, and 231 tests (27.7%) fell between 2 and 4, against 21.8% statewide. The busiest year on file was 2014, with 96 tests reported; the quietest, 2022, had 3.

EPA's 1993 zone map puts Rockingham County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 81% of the county's land moderate radon potential.

Next door, the shares run from 3.7% in Alamance County to 38.4% in Pittsylvania County, VA, with Stokes County, Caswell County and Guilford County below Rockingham County.

CDC also counts 18 tests taken after mitigation in Rockingham County for the same period: tests in homes where a fix was already in.

Rockingham County against North Carolina, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Rockingham County
Rockingham County83527.3%2.1 pCi/LThis county
North Carolina, pooled99 counties, pooled73,13922.6%Not pooled−4.7 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+8.4 points
Transylvania Countyhighest in the state3,86247.8%3.7 pCi/L+20.5 points
Nash Countylowest in the state300.0%0.2 pCi/L−27.3 points
Pittsylvania County, VAborders it24238.4%3.0 pCi/L+11.1 points
Henry County, VAborders it11535.7%2.7 pCi/L+8.4 points
Forsyth County, NCborders it6,27328.9%2.3 pCi/L+1.6 points
Stokes County, NCborders it59221.6%1.8 pCi/L−5.7 points
Caswell County, NCborders it4714.9%1.6 pCi/L−12.4 points
Guilford County, NCborders it6,8707.9%0.9 pCi/L−19.4 points
Alamance County, NCborders it5203.7%0.5 pCi/L−23.6 points
Where Rockingham County's reported results fell, 2008 to 2017, laboratory, beside North Carolina and the United States
ResultRockingham County testsRockingham County shareNorth Carolina shareU.S. shareAgainst North Carolina
Under 2 pCi/L37645.0%55.6%39.6%−10.6 points
2 to 4 pCi/L23127.7%21.8%24.7%+5.9 points
4 pCi/L and above22827.3%22.6%35.7%+4.7 points
Rockingham County ranked among the 75 North Carolina counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Yadkin County25 of 7519928.6%2.2 pCi/L
Mitchell County26 of 7543328.6%2.1 pCi/L
Burke County27 of 7594028.3%2.4 pCi/L
Jackson County28 of 751,02627.7%2.2 pCi/L
Caldwell County29 of 7586127.6%2.5 pCi/L
Rockingham County30 of 7583527.3%2.1 pCi/L
Dare County31 of 754126.8%0.1 pCi/L
Rutherford County32 of 7551125.6%2.4 pCi/L
Davidson County33 of 751,26525.5%1.8 pCi/L
Stanly County34 of 7522925.3%2.2 pCi/L
Catawba County35 of 751,25924.8%2.0 pCi/L
Rockingham County radon tests by year, against North Carolina's pooled share
YearTestsAt or above 4 pCi/LMedianHighestNorth Carolina, pooledChange from the row before
2022333.3%1.0 pCi/L4.0 pCi/L10.7%+10.6 points
20212222.7%1.5 pCi/L6.0 pCi/L14.9%−3.3 points
20207326.0%1.8 pCi/L25.0 pCi/L21.1%+1.0 points
20149625.0%2.0 pCi/L18.0 pCi/L21.9%First on file

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

Rockingham County, Geology

The ground under Rockingham County

Predicted

Most of the ground under Rockingham County is one class on USGS's geologic map: 80.7% of its land is moderate radon potential, with 19.2% low. The map puts 73.6% of Rockingham County in the area it calls Milton Belt and 16.8% in Dan River Basin, with 3 smaller areas beside them. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 8, in the low band (5 to 8).

USGS's geologic areas under Rockingham County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Milton BeltProterozoic-Cambrian biotite gneiss and felsic mica gneiss.Moderate1173.6%
Dan River BasinSandstone, siltstone and shale.Low816.8%
Inner Piedmont BeltProterozoic through Cambrian biotite gneiss and schist, and mica schist.Moderate116.9%
Charlotte BeltIgneous rocks, including granite, gabbro, and diorite.Low81.8%
Carolina Slate BeltFelsic metavolcanics, intermediate volcanics, metamudstone, argillite, and epiclastic rocks.Low60.6%

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

Rockingham County beside the ground around it

Across North Carolina 1.3% of the land is rated high; none of Rockingham County's is. Of the 7 counties that border it, 3 have more high-potential ground, Henry County, VA the most at 97.9%.

Share of land by USGS radon potential: Rockingham County, the 7 counties bordering it and North Carolina
AreaEPA zoneLow potentialModerate potentialHigh potential
Rockingham CountyZone 119.2%80.7%None
Guilford CountyZone 390.9%9.1%None
Henry County, VAZone 1None2.1%97.9%
Caswell CountyZone 234.6%65.4%None
Stokes CountyZone 210.3%89.7%0.1%
Alamance CountyZone 3100%NoneNone
Pittsylvania County, VAZone 1None47.7%52.3%
Forsyth CountyZone 223.7%76.3%None
North Carolina100 counties, pooled by land areaVaries64.8%33.0%1.3%

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

Local help

Rockingham County, Local resources

Radon testing and mitigation in Rockingham County

What North Carolina's program says
Licensing of radon professionals
The North Carolina Radon Program is presently developing a Radon Proficiency Program as directed by Session Law 2023-91 House Bill 782 .

What it means

Rockingham County, Questions

Questions about radon in Rockingham County

Are radon levels high in Rockingham County?

In 2022, 33.3% of the radon tests reported to CDC for Rockingham County, North Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.0 pCi/L. Of 75 North Carolina counties with 30 or more tests for the same period, 29 reported a higher share; pooled, the state comes to 22.6%.

Which counties border Rockingham County?

Rockingham County borders 7 counties: Guilford County, NC, Henry County, VA, Caswell County, NC, Stokes County, NC, Alamance County, NC, Pittsylvania County, VA and Forsyth County, NC.

Products

Rockingham County, Products

Testing a home in Rockingham County

In Rockingham County, 27.3% of 835 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 22.6% pooled across North Carolina. In Zone 1 the year-round level in Rockingham 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

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

Explore

Rockingham County, Bordering counties

Counties bordering Rockingham County

Calculated by Radon411

Rockingham County, Cities and towns

Cities and towns in Rockingham County

The Census Bureau estimates 94,195 residents in Rockingham County for July 1, 2025, 2,994 more than in 2020 (+3.3%). That works out to 167 people per square mile of land. No town dominates: Eden, the largest, has 15,500 residents, 16.5% of the total. Together its 6 incorporated places hold 41.4% of those residents; the other 58.6% live outside any of them. CDC's 835 reported tests for 2008 to 2017 work out to 8.9 per 1,000 residents (2025 estimate), close to North Carolina's 6.5.

From Eden to Stoneville, CDC publishes no figure by town: each reads Rockingham County's.

The cities and towns in Rockingham County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Eden15,500+0.5%16.5%
Reidsville14,692+0.7%15.6%
Wentworth2,774+4.4%2.9%
Mayodan2,503+3.6%2.7%
Madison2,190+3.0%2.3%
Stoneville1,364+4.0%1.4%

6 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).

Rockingham County, Homes

Homes in Rockingham County

Of Rockingham County's 43,685 homes, 71% are detached houses, against 65% across North Carolina; 17% are mobile homes. The homes are older than North Carolina's as a whole: half were built before 1979 (1990 for North Carolina), and 25% date from before 1960. 72% of occupied homes are lived in by their owner (North Carolina: 66%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Rockingham County, North Carolina, 2019 to 2023
HomesRockingham CountyNorth Carolina
Housing units43,6854,815,195
Detached houses71%65%
In buildings of 5 or more7%14%
Mobile homes17%11%
Built before 196025%14%
Built since 200019%33%
Middle year built19791990
Owner-occupied72%66%

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