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Radon Levels in Caswell County, North Carolina

EPA puts Caswell County in Zone 2, its middle radon zone, and only 3 radon tests from it are on file with CDC (2021). 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

    14.9%

    7.7 pts below NC

    Caswell
    14.9%
    NC
    22.6%

    47 tests, 2008 to 2017

  • Median result

    1.6pCi/L

    Below action level

    Caswell
    1.6 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    47

    70th of 75 by tests

    Caswell
    47
    Wake
    9,694

    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 NC

    47 of 75

    Middle half

    Caswell
    14.9%
    Transylvania
    47.8%

    By share, of 75 with 30+ tests

Read a result for Caswell County

Starts at Caswell County's median, 1.6 pCi/L

1.6pCi/L

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

EPA’s reading of 1.6 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. Caswell County's median reported result, 2008 to 2017.

Interpret this reading

The data

Caswell County, At a glance

Caswell County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Caswell 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 65% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Caswell County, 2021

Share of reported tests at or above 4 pCi/L, by year, Caswell County
Share of reported tests at or above 4 pCi/L, by year, Caswell County
YearShare of reported tests at or above 4 pCi/L
20140.0%
202044.0%
20210.0%

2021: 0.0%. Across these years the share ran from 0.0% to 44.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 3 tests were reported to CDC for Caswell County over 2021, 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: 2021. Measured data period: 2005 to 2021 (every CDC figure on file).

How to read these figures

Caswell County, Compared

Caswell County radon figures, compared

Calculated by Radon411

Caswell County reports fewer high tests than North Carolina overall. 14.9% of its 47 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 7.7 points below the 22.6% pooled from 99 North Carolina counties.

The newest figure, in 2021, counts only 3 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 47-test figure.

Ordered from highest share down, it comes 47th of 75 North Carolina counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 35.7%; Caswell County sits 20.8 points below it.

Next door, the shares run from 3.7% in Alamance County to 38.4% in Pittsylvania County, VA, with Orange County and Alamance County below Caswell County. Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 14.9% share point the same way here.

Half the tests came in under 1.6 pCi/L and half over it; the single highest reached 6.7 pCi/L. The rest split 57.4% under 2 pCi/L and 27.7% from 2 to 4 (North Carolina: 55.6% and 21.8%).

The busiest year on file was 2020, with 25 tests reported; the quietest, 2014, had 1.

Caswell County against North Carolina, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Caswell County
Caswell County4714.9%1.6 pCi/LThis county
North Carolina, pooled99 counties, pooled73,13922.6%Not pooled+7.7 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+20.8 points
Transylvania Countyhighest in the state3,86247.8%3.7 pCi/L+32.9 points
Nash Countylowest in the state300.0%0.2 pCi/L−14.9 points
Pittsylvania County, VAborders it24238.4%3.0 pCi/L+23.5 points
Danville city, VAborders it7735.1%3.0 pCi/L+20.2 points
Rockingham County, NCborders it83527.3%2.1 pCi/L+12.4 points
Halifax County, VAborders it3718.9%2.2 pCi/L+4.0 points
Person County, NCborders it19017.4%1.3 pCi/L+2.5 points
Orange County, NCborders it1,09510.7%1.1 pCi/L−4.2 points
Alamance County, NCborders it5203.7%0.5 pCi/L−11.2 points
Where Caswell County's reported results fell, 2008 to 2017, laboratory, beside North Carolina and the United States
ResultCaswell County testsCaswell County shareNorth Carolina shareU.S. shareAgainst North Carolina
Under 2 pCi/L2757.4%55.6%39.6%+1.8 points
2 to 4 pCi/L1327.7%21.8%24.7%+5.9 points
4 pCi/L and above714.9%22.6%35.7%−7.7 points
Caswell 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
Rowan County42 of 7562617.7%1.4 pCi/L
Davie County43 of 7569417.4%1.7 pCi/L
Person County44 of 7519017.4%1.3 pCi/L
Macon County45 of 751,35417.1%1.4 pCi/L
Madison County46 of 7522816.7%1.3 pCi/L
Caswell County47 of 754714.9%1.6 pCi/L
Vance County48 of 7510914.7%1.5 pCi/L
Union County49 of 7583611.2%1.1 pCi/L
Chatham County50 of 7558710.9%1.1 pCi/L
Orange County51 of 751,09510.7%1.1 pCi/L
Granville County52 of 7515310.5%0.8 pCi/L
Caswell County radon tests by year, against North Carolina's pooled share
YearTestsAt or above 4 pCi/LMedianHighestNorth Carolina, pooledChange from the row before
202130.0%0.1 pCi/L2.0 pCi/L14.9%−44.0 points
20202544.0%3.6 pCi/L16.7 pCi/L21.1%+44.0 points
201410.0%2.0 pCi/L2.0 pCi/L21.9%First on file

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

Caswell County, Geology

The ground under Caswell County

Predicted

USGS's geologic map splits Caswell County: 65.4% of its land is moderate radon potential and 34.6% low. The map puts 65.2% of Caswell County in the area it calls Milton Belt and 34.6% in Carolina Slate Belt. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 6, in the low band (5 to 8).

USGS's geologic areas under Caswell County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Milton BeltProterozoic-Cambrian biotite gneiss and felsic mica gneiss.Moderate1165.2%
Carolina Slate BeltFelsic metavolcanics, intermediate volcanics, metamudstone, argillite, and epiclastic rocks.Low634.6%

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

Caswell County beside the ground around it

Across North Carolina 1.3% of the land is rated high; none of Caswell County's is. Of the 7 counties that border it, 1 has more high-potential ground, Pittsylvania County, VA the most at 52.3%.

Share of land by USGS radon potential: Caswell County, the 7 counties bordering it and North Carolina
AreaEPA zoneLow potentialModerate potentialHigh potential
Caswell CountyZone 234.6%65.4%None
Danville city, VAZone 1None100%None
Person CountyZone 387.2%12.8%None
Alamance CountyZone 3100%NoneNone
Rockingham CountyZone 119.2%80.7%None
Pittsylvania County, VAZone 1None47.7%52.3%
Orange CountyZone 3100%NoneNone
Halifax County, VAZone 20.2%99.8%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

Caswell County, Local resources

Radon testing and mitigation in Caswell 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

Caswell County, Questions

Questions about radon in Caswell County

Are radon levels high in Caswell County?

In 2021, 0.0% of the radon tests reported to CDC for Caswell County, North Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Of 75 North Carolina counties with 30 or more tests for the same period, 46 reported a higher share; pooled, the state comes to 22.6%.

Which counties border Caswell County?

Caswell County borders 7 counties: Danville city, VA, Person County, NC, Alamance County, NC, Rockingham County, NC, Pittsylvania County, VA, Orange County, NC and Halifax County, VA.

Products

Caswell County, Products

Testing a home in Caswell County

In Caswell County, 14.9% of 47 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 22.6% pooled across North Carolina. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Caswell County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Caswell County homes, compared

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Caswell County, Bordering counties

Counties bordering Caswell County

Calculated by Radon411

Caswell County, Cities and towns

Cities and towns in Caswell County

Caswell County's population has barely moved since 2020: 22,563 residents on July 1, 2025 against 22,476 then, by the Census Bureau's estimates. That works out to 53 people per square mile of land. No town dominates: Yanceyville, the largest, has 1,850 residents, 8.2% of the total. Together its 2 incorporated places hold 9.0% of those residents; the other 91.0% live outside any of them. Reported testing is thin here: 47 tests over 2008 to 2017, or 2.1 for every 1,000 residents (2025 estimate), where North Carolina as a whole comes to 6.5.

From Yanceyville to Milton, CDC publishes no figure by town: each reads Caswell County's.

The cities and towns in Caswell County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Yanceyville1,850−0.8%8.2%
Milton176Level0.8%

2 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).

Caswell County, Homes

Homes in Caswell County

Of Caswell County's 10,490 homes, 74% are detached houses, against 65% across North Carolina; 22% are mobile homes. The homes are older than North Carolina's as a whole: half were built before 1982 (1990 for North Carolina), and 22% date from before 1960. Owners live in 76% of the occupied homes (North Carolina: 66%), so for most households a test and a fix are their own to order.

Homes in Caswell County, North Carolina, 2019 to 2023
HomesCaswell CountyNorth Carolina
Housing units10,4904,815,195
Detached houses74%65%
In buildings of 5 or more1%14%
Mobile homes22%11%
Built before 196022%14%
Built since 200021%33%
Middle year built19821990
Owner-occupied76%66%

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