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Radon Levels in Warren County, North Carolina

EPA puts Warren County in Zone 2, its middle radon zone, and only 2 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

    40.5%

    17.3 pts above NC

    Warren
    40.5%
    NC
    23.2%

    84 tests, 2007 to 2016

  • Median result

    2.8pCi/L

    Below action level

    Warren
    2.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2007 to 2016

  • Tests reported

    84

    59th of 73 by tests

    Warren
    84
    Wake
    9,664

    Reported to CDC before any fix, 2007 to 2016

  • 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

    10 of 73

    Top quarter

    Warren
    40.5%
    Transylvania
    48.1%

    By share, of 73 with 30+ tests

Read a result for Warren County

Starts at Warren County's median, 2.8 pCi/L

2.8pCi/L

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

EPA’s reading of 2.8 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. Warren County's median reported result, 2007 to 2016.

Interpret this readingWhat a fix costs

The data

Warren County, At a glance

Warren County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Warren 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 Warren County, 2021

Share of reported tests at or above 4 pCi/L, by year, Warren County
Share of reported tests at or above 4 pCi/L, by year, Warren County
YearShare of reported tests at or above 4 pCi/L
20140.0%
202018.2%
20210.0%

2021: 0.0%. Across these years the share ran from 0.0% to 18.2%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 2 tests were reported to CDC for Warren 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

Warren County, Compared

Warren County radon figures, compared

Calculated by Radon411

In Warren County, about 4 in 10 reported tests over the 2007 to 2016 laboratory totals (34 of 84) were at or above EPA's action level. Against the national pool of 35.8%, the gap is 4.7 points higher. Across 99 North Carolina counties pooled together, 23.2% of tests reached that level, so Warren County runs 17.3 points above its state.

The newest figure, in 2021, counts only 2 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 84-test figure.

Of 6 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 13.6% (Vance County) to 39.7% (Mecklenburg County, VA). By share, Warren County is 10th of 73 North Carolina counties with 30 or more tests for the same period.

Half the tests came in under 2.8 pCi/L and half over it; the single highest reached 33.6 pCi/L. Below the action level, 31 tests (36.9%) came in under 2 pCi/L, against 55.2% statewide, and 19 tests (22.6%) fell between 2 and 4, against 21.6% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 40.5% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential.

The busiest year on file was 2020, with 11 tests reported; the quietest, 2021, had 2.

Warren County against North Carolina, the United States and nearby counties, 2007 to 2016, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Warren County
Warren County8440.5%2.8 pCi/LThis county
North Carolina, pooled99 counties, pooled70,56623.2%Not pooled−17.3 points
United States, pooled2,666 counties, pooled1,939,02535.8%Not pooled−4.7 points
Transylvania Countyhighest in the state3,99648.1%3.7 pCi/L+7.6 points
Columbus Countylowest in the state320.0%0.1 pCi/L−40.5 points
Mecklenburg County, VAborders it5839.7%3.2 pCi/L−0.8 points
Halifax County, NCborders it5839.7%2.5 pCi/L−0.8 points
Brunswick County, VAborders it3638.9%2.8 pCi/L−1.6 points
Northampton County, NCborders it5637.5%3.3 pCi/L−3.0 points
Franklin County, NCborders it19722.3%1.4 pCi/L−18.2 points
Vance County, NCborders it10313.6%1.6 pCi/L−26.9 points
Nash County, NCborders it210.0%0.1 pCi/L−40.5 points
Where Warren County's reported results fell, 2007 to 2016, laboratory, beside North Carolina and the United States
ResultWarren County testsWarren County shareNorth Carolina shareU.S. shareAgainst North Carolina
Under 2 pCi/L3136.9%55.2%39.6%−18.3 points
2 to 4 pCi/L1922.6%21.6%24.6%+1.0 points
4 pCi/L and above3440.5%23.2%35.8%+17.3 points
Warren County ranked among the 73 North Carolina counties with 30 or more tests, by share at or above 4 pCi/L, 2007 to 2016, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Cherokee County5 of 7397542.7%3.3 pCi/L
Henderson County6 of 734,12642.6%3.3 pCi/L
Wilkes County7 of 7339441.9%3.3 pCi/L
Graham County8 of 736841.2%2.9 pCi/L
Alleghany County9 of 7327040.7%3.2 pCi/L
Warren County10 of 738440.5%2.8 pCi/L
Halifax County11 of 735839.7%2.5 pCi/L
Cleveland County12 of 7350239.4%2.8 pCi/L
Northampton County13 of 735637.5%3.3 pCi/L
Avery County14 of 7314637.0%2.7 pCi/L
McDowell County15 of 7374636.5%2.6 pCi/L
Warren County radon tests by year, against North Carolina's pooled share
YearTestsAt or above 4 pCi/LMedianHighestNorth Carolina, pooledChange from the row before
202120.0%1.0 pCi/L1.0 pCi/L14.9%−18.2 points
20201118.2%2.0 pCi/L6.0 pCi/L21.1%+18.2 points
201430.0%0.1 pCi/L0.1 pCi/L21.9%First on file

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

Warren County, Geology

The ground under Warren County

Predicted

USGS's geologic map puts all of Warren County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Raleigh Belt, to which USGS gives a radon index of 11, in the moderate band (9 to 11).

USGS's geologic areas under Warren County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Raleigh BeltProterozoic through Cambrian biotite gneiss and mica schist.Moderate11100%

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

Warren County beside the ground around it

Across North Carolina 1.3% of the land is rated high; none of Warren County's is. Of the 7 counties that border it, 2 have more high-potential ground, Brunswick County, VA the most at 86.9%.

Share of land by USGS radon potential: Warren County, the 7 counties bordering it and North Carolina
AreaEPA zoneLow potentialModerate potentialHigh potential
Warren CountyZone 2None100%None
Vance CountyZone 236.7%63.3%None
Franklin CountyZone 20.2%99.8%None
Halifax CountyZone 389.8%10.2%None
Nash CountyZone 386.8%13.2%None
Mecklenburg County, VAZone 20.2%61.4%38.4%
Brunswick County, VAZone 112.9%0.2%86.9%
Northampton CountyZone 397.5%2.5%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

Warren County, Local resources

Radon testing and mitigation in Warren 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

Warren County, Questions

Questions about radon in Warren County

Are radon levels high in Warren County?

In 2021, 0.0% of the radon tests reported to CDC for Warren County, North Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.0 pCi/L. Of 73 North Carolina counties with 30 or more tests for the same period, 9 reported a higher share; pooled, the state comes to 23.2%.

Which counties border Warren County?

Warren County borders 7 counties: Vance County, NC, Franklin County, NC, Halifax County, NC, Nash County, NC, Mecklenburg County, VA, Brunswick County, VA and Northampton County, NC.

Products

Warren County, Products

Testing a home in Warren County

In Warren County, 40.5% of 84 tests reported to CDC over the 2007 to 2016 laboratory totals reached 4 pCi/L, against 23.2% pooled across North Carolina. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Warren County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Warren County homes, compared

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Warren County, Bordering counties

Counties bordering Warren County

Calculated by Radon411

Warren County, Cities and towns

Cities and towns in Warren County

The Census Bureau estimates 18,898 residents in Warren County for July 1, 2025, 292 more than in 2020 (+1.6%). That works out to 44 people per square mile of land. No town dominates: Norlina, the largest, has 924 residents, 4.9% of the total. Together its 3 incorporated places hold 9.8% of those residents; the other 90.2% live outside any of them. CDC's 84 reported tests for 2007 to 2016 work out to 4.4 per 1,000 residents (2025 estimate), close to North Carolina's 6.3.

From Norlina to Macon, CDC publishes no figure by town: each reads Warren County's.

The cities and towns in Warren County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Norlina924+1.8%4.9%
Warrenton819+0.4%4.3%
Macon104+1.0%0.6%

3 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).

Warren County, Homes

Homes in Warren County

Of Warren County's 11,543 homes, 56% are detached houses, against 65% across North Carolina; 40% are mobile homes. Half of its homes were built before 1987, close to North Carolina's 1990: 16% date from before 1960 and 23% from 2000 or later. 70% 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 Warren County, North Carolina, 2019 to 2023
HomesWarren CountyNorth Carolina
Housing units11,5434,815,195
Detached houses56%65%
In buildings of 5 or more3%14%
Mobile homes40%11%
Built before 196016%14%
Built since 200023%33%
Middle year built19871990
Owner-occupied70%66%

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