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Radon Levels in Nash County, North Carolina

EPA puts Nash County in Zone 3, its lowest radon zone, and only 1 radon test from it is 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

    9.6%

    5.3 pts below NC

    Nash
    9.6%
    NC
    14.9%

    52 tests, 2021

  • Median result

    0.1pCi/L

    Below action level

    Nash
    0.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2021

  • Tests reported

    52

    29th of 36 by tests

    Nash
    52
    Buncombe
    742

    Reported to CDC before any fix, 2021

  • 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 NC

    25 of 36

    Middle half

    Nash
    9.6%
    Ashe
    48.5%

    By share, of 36 with 30+ tests

Read a result for Nash County

Starts at Nash County's median, 0.1 pCi/L

0.2pCi/L

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

EPA’s reading of 0.2 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. 0.1 pCi/L above Nash County's median of 0.1 pCi/L.

Interpret this reading

The data

Nash County, At a glance

Nash County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Nash 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 87% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Nash County, 2022

Share of reported tests at or above 4 pCi/L, by year, Nash County
Share of reported tests at or above 4 pCi/L, by year, Nash County
YearShare of reported tests at or above 4 pCi/L
20140.0%
20200.0%
20219.6%
20220.0%

2022: 0.0%. Across these years the share ran from 0.0% to 9.6%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 1 test was reported to CDC for Nash 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

Nash County, Compared

Nash County radon figures, compared

Calculated by Radon411

Nash County reports fewer high tests than North Carolina overall. 9.6% of its 52 tests in 2021 were at or above 4 pCi/L. That is 5.3 points below the 14.9% pooled from 82 North Carolina counties.

The newest figure, in 2022, counts only 1 test (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 52-test figure.

Ordered from highest share down, it comes 25th of 36 North Carolina counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 24.4%; Nash County sits 14.8 points below it.

Next door, the shares run from 3.6% in Johnston County to 7.5% in Wake County, with Wake County and Johnston County below Nash County. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 9.6% share point the same way here.

Half the tests came in under 0.1 pCi/L and half over it; the single highest reached 24.0 pCi/L. The rest split 84.6% under 2 pCi/L and 5.8% from 2 to 4 (North Carolina: 65.1% and 20.0%).

The busiest year on file was 2021, with 52 tests reported; the quietest, 2022, had 1.

Nash County against North Carolina, the United States and nearby counties, 2021
AreaTestsAt or above 4 pCi/LMedianDifference from Nash County
Nash County529.6%0.1 pCi/LThis county
North Carolina, pooled82 counties, pooled6,60314.9%Not pooled+5.3 points
United States, pooled807 counties, pooled344,60424.4%Not pooled+14.8 points
Ashe Countyhighest in the state3348.5%3.0 pCi/L+38.9 points
Alamance Countylowest in the state560.0%0.1 pCi/L−9.6 points
Franklin County, NCborders it119.1%1.0 pCi/L−0.5 points
Wake County, NCborders it4667.5%0.1 pCi/L−2.1 points
Halifax County, NCborders it147.1%0.1 pCi/L−2.5 points
Johnston County, NCborders it563.6%0.1 pCi/L−6.0 points
Edgecombe County, NCborders it20.0%0.1 pCi/L−9.6 points
Warren County, NCborders it20.0%1.0 pCi/L−9.6 points
Wilson County, NCborders it110.0%0.1 pCi/L−9.6 points
Where Nash County's reported results fell, 2021, beside North Carolina and the United States
ResultNash County testsNash County shareNorth Carolina shareU.S. shareAgainst North Carolina
Under 2 pCi/L4484.6%65.1%54.4%+19.5 points
2 to 4 pCi/L35.8%20.0%21.2%−14.2 points
4 pCi/L and above59.6%14.9%24.4%−5.3 points
Nash County ranked among the 36 North Carolina counties with 30 or more tests, by share at or above 4 pCi/L, 2021
CountyRankTestsAt or above 4 pCi/LMedian
Watauga County20 of 3616812.5%0.1 pCi/L
Buncombe County21 of 3674211.1%1.0 pCi/L
Lincoln County22 of 369210.9%1.0 pCi/L
Orange County23 of 369410.6%0.6 pCi/L
Union County24 of 36619.8%0.1 pCi/L
Nash County25 of 36529.6%0.1 pCi/L
Durham County26 of 36728.3%0.1 pCi/L
Rowan County27 of 361508.0%0.1 pCi/L
Davidson County28 of 36517.8%0.1 pCi/L
Wake County29 of 364667.5%0.1 pCi/L
Alexander County30 of 36345.9%1.0 pCi/L
Nash County radon tests by year, against North Carolina's pooled share
YearTestsAt or above 4 pCi/LMedianHighestNorth Carolina, pooledChange from the row before
202210.0%0.1 pCi/L0.1 pCi/L10.7%−9.6 points
2021529.6%0.1 pCi/L24.0 pCi/L14.9%+9.6 points
2020310.0%0.1 pCi/L3.0 pCi/L21.1%Level
201460.0%0.4 pCi/L3.0 pCi/L21.9%First on file

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

Nash County, Geology

The ground under Nash County

Predicted

Most of the ground under Nash County is one class on USGS's geologic map: 86.8% of its land is low radon potential, with 13.2% moderate. The map puts 65.8% of Nash County in the area it calls Eastern Slate Belt and 21.0% in Inner Coastal Plain, with one smaller area beside them. USGS gives both a radon index of 8, in the low band (5 to 8).

USGS's geologic areas under Nash County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Eastern Slate BeltProterozoic to Cambrian metamudstone and argillite, interbedded with metamorphosed sandstone, conglomerate, and volcanic rock.Low865.8%
Inner Coastal PlainFossiliferous clay and sand, shelly sand, sandy marl, and limestone.Low821.0%
Raleigh BeltProterozoic through Cambrian biotite gneiss and mica schist.Moderate1113.2%

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

Nash County beside the ground around it

Across North Carolina 1.3% of the land is rated high; none of Nash County's is. Of the 7 counties that border it, 4 have more moderate-potential ground, Warren County the most at 100%.

Share of land by USGS radon potential: Nash County, the 7 counties bordering it and North Carolina
AreaEPA zoneLow potentialModerate potentialHigh potential
Nash CountyZone 386.8%13.2%None
Wilson CountyZone 3100%NoneNone
Franklin CountyZone 20.2%99.8%None
Edgecombe CountyZone 3100%NoneNone
Halifax CountyZone 389.8%10.2%None
Warren CountyZone 2None100%None
Johnston CountyZone 369.1%30.9%None
Wake CountyZone 220.6%79.4%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

Nash County, Local resources

Radon testing and mitigation in Nash 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

Nash County, Questions

Questions about radon in Nash County

Are radon levels high in Nash County?

In 2022, 0.0% of the radon tests reported to CDC for Nash County, North Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Of 36 North Carolina counties with 30 or more tests for the same period, 24 reported a higher share; pooled, the state comes to 14.9%.

Which counties border Nash County?

Nash County borders 7 counties: Wilson County, Franklin County, Edgecombe County, Halifax County, Warren County, Johnston County and Wake County.

Products

Nash County, Products

Testing a home in Nash County

In Nash County, 9.6% of 52 tests reported to CDC in 2021 reached 4 pCi/L, against 14.9% pooled across North Carolina. 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 Nash County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Nash County homes, compared

Explore

Nash County, Bordering counties

Counties bordering Nash County

Calculated by Radon411

Nash County, Cities and towns

Cities and towns in Nash County

The Census Bureau estimates 99,365 residents in Nash County for July 1, 2025, 3,732 more than in 2020 (+3.9%). That works out to 184 people per square mile of land. Rocky Mount, the largest place on its list (55,120 residents in all), extends beyond Nash County, so no share of the total is worked out for it. CDC's 52 reported tests for 2021 work out to 0.5 per 1,000 residents (2025 estimate), close to North Carolina's 0.6.

From Rocky Mount to Momeyer, CDC publishes no figure by town: each reads Nash County's.

The cities and towns in Nash County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Rocky Mountextends beyond Nash County55,120+0.4%Counted whole
Nashville5,911+4.8%5.9%
Red Oak3,523+5.0%3.5%
Sharpsburgextends beyond Nash County1,798+4.3%Counted whole
Spring Hope1,383+5.0%1.4%
Elm Cityextends beyond Nash County1,250+1.5%Counted whole
Dortches1,103+5.1%1.1%
Middlesex975+5.5%1.0%
Whitakersextends beyond Nash County646+2.7%Counted whole
Bailey593+5.0%0.6%
Castalia280+7.3%0.3%
Momeyer261+6.5%0.3%

12 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 Nash County is counted whole, so it has no share.

Nash County, Homes

Homes in Nash County

Of Nash County's 43,537 homes, 65% are detached houses, against 65% across North Carolina; 16% are mobile homes. Half of its homes were built before 1985, close to North Carolina's 1990: 18% date from before 1960 and 24% from 2000 or later. 64% 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 Nash County, North Carolina, 2019 to 2023
HomesNash CountyNorth Carolina
Housing units43,5374,815,195
Detached houses65%65%
In buildings of 5 or more8%14%
Mobile homes16%11%
Built before 196018%14%
Built since 200024%33%
Middle year built19851990
Owner-occupied64%66%

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