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Radon Levels in Northampton County, North Carolina

EPA puts Northampton 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

    40.3%

    17.7 pts above NC

    Northampton
    40.3%
    NC
    22.6%

    62 tests, 2008 to 2017

  • Median result

    3.4pCi/L

    Below action level

    Northampton
    3.4 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    62

    64th of 75 by tests

    Northampton
    62
    Wake
    9,694

    Reported to CDC before any fix, 2008 to 2017

  • 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

    12 of 75

    Top quarter

    Northampton
    40.3%
    Transylvania
    47.8%

    By share, of 75 with 30+ tests

Read a result for Northampton County

Starts at Northampton County's median, 3.4 pCi/L

3.4pCi/L

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

EPA’s reading of 3.4 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. Northampton County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Northampton County, At a glance

Northampton County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Northampton 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 98% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Northampton County, 2022

Share of reported tests at or above 4 pCi/L, by year, Northampton County
Share of reported tests at or above 4 pCi/L, by year, Northampton County
YearShare of reported tests at or above 4 pCi/L
201431.3%
202045.5%
202140.0%
2022100.0%

2022: 100.0%. Across these years the share ran from 31.3% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 1 test was reported to CDC for Northampton 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

Northampton County, Compared

Northampton County radon figures, compared

Calculated by Radon411

In Northampton County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (25 of 62) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 4.6 points higher. Across 99 North Carolina counties pooled together, 22.6% of tests reached that level, so Northampton County runs 17.7 points above its state.

The newest figure, in 2022, counts only 1 test (100.0% at or above 4 pCi/L), too few to compare, so this reading uses the 62-test figure.

Of 3 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 39.5% (Brunswick County, VA) to 42.7% (Warren County). By share, Northampton County is 12th of 75 North Carolina counties with 30 or more tests for the same period.

Half the tests came in under 3.4 pCi/L and half over it; the single highest reached 54.3 pCi/L. Below the action level, 21 tests (33.9%) came in under 2 pCi/L, against 55.6% statewide, and 16 tests (25.8%) fell between 2 and 4, against 21.8% statewide.

The reported tests do not follow EPA's Zone 3 label for Northampton County (predicted average under 2 pCi/L): 40.3% of them reached 4 pCi/L, more than a low-potential zone suggests. USGS geology rates 98% of the county's land low radon potential.

The busiest year on file was 2014, with 16 tests reported; the quietest, 2022, had 1.

Northampton County against North Carolina, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Northampton County
Northampton County6240.3%3.4 pCi/LThis county
North Carolina, pooled99 counties, pooled73,13922.6%Not pooled−17.7 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−4.6 points
Transylvania Countyhighest in the state3,86247.8%3.7 pCi/L+7.5 points
Nash Countylowest in the state300.0%0.2 pCi/L−40.3 points
Warren County, NCborders it8242.7%3.0 pCi/L+2.4 points
Halifax County, NCborders it5942.4%2.6 pCi/L+2.1 points
Brunswick County, VAborders it3839.5%2.8 pCi/L−0.8 points
Bertie County, NCborders it425.0%1.1 pCi/L−15.3 points
Hertford County, NCborders it20.0%0.4 pCi/L−40.3 points
Greensville County, VAborders it20.0%0.7 pCi/L−40.3 points
Southampton County, VAborders it20.0%1.1 pCi/L−40.3 points
Where Northampton County's reported results fell, 2008 to 2017, laboratory, beside North Carolina and the United States
ResultNorthampton County testsNorthampton County shareNorth Carolina shareU.S. shareAgainst North Carolina
Under 2 pCi/L2133.9%55.6%39.6%−21.7 points
2 to 4 pCi/L1625.8%21.8%24.7%+4.0 points
4 pCi/L and above2540.3%22.6%35.7%+17.7 points
Northampton 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
Warren County7 of 758242.7%3.0 pCi/L
Halifax County8 of 755942.4%2.6 pCi/L
Graham County9 of 756942.0%3.0 pCi/L
Henderson County10 of 754,09341.8%3.3 pCi/L
Alleghany County11 of 7528541.1%3.3 pCi/L
Northampton County12 of 756240.3%3.4 pCi/L
Cleveland County13 of 7551139.5%2.8 pCi/L
Avery County14 of 7516038.8%2.8 pCi/L
McDowell County15 of 7577637.5%2.7 pCi/L
Ashe County16 of 7568134.1%2.5 pCi/L
Surry County17 of 7585533.3%2.4 pCi/L
Northampton County radon tests by year, against North Carolina's pooled share
YearTestsAt or above 4 pCi/LMedianHighestNorth Carolina, pooledChange from the row before
20221100.0%6.0 pCi/L6.0 pCi/L10.7%+60.0 points
2021540.0%3.0 pCi/L4.0 pCi/L14.9%−5.5 points
20201145.5%3.0 pCi/L125.0 pCi/L21.1%+14.2 points
20141631.3%3.0 pCi/L19.0 pCi/L21.9%First on file

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

Northampton County, Geology

The ground under Northampton County

Predicted

Most of the ground under Northampton County is one class on USGS's geologic map: 97.5% of its land is low radon potential, with 2.5% moderate. The map puts 88.4% of Northampton County in the area it calls Inner Coastal Plain and 9.1% in Eastern Slate Belt, 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 Northampton County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Inner Coastal PlainFossiliferous clay and sand, shelly sand, sandy marl, and limestone.Low888.4%
Eastern Slate BeltProterozoic to Cambrian metamudstone and argillite, interbedded with metamorphosed sandstone, conglomerate, and volcanic rock.Low89.1%
Raleigh BeltProterozoic through Cambrian biotite gneiss and mica schist.Moderate112.5%

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

Northampton County beside the ground around it

Across North Carolina 1.3% of the land is rated high; none of Northampton 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: Northampton County, the 7 counties bordering it and North Carolina
AreaEPA zoneLow potentialModerate potentialHigh potential
Northampton CountyZone 397.5%2.5%None
Halifax CountyZone 389.8%10.2%None
Hertford CountyZone 399.1%NoneNone
Greensville County, VAZone 399.5%None0.5%
Bertie CountyZone 399.8%NoneNone
Southampton County, VAZone 3100%NoneNone
Warren CountyZone 2None100%None
Brunswick County, VAZone 112.9%0.2%86.9%
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

Northampton County, Local resources

Radon testing and mitigation in Northampton 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

Northampton County, Questions

Questions about radon in Northampton County

Are radon levels high in Northampton County?

In 2022, 100.0% of the radon tests reported to CDC for Northampton County, North Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 6.0 pCi/L. Of 75 North Carolina counties with 30 or more tests for the same period, 11 reported a higher share; pooled, the state comes to 22.6%.

Which counties border Northampton County?

Northampton County borders 7 counties: Halifax County, NC, Hertford County, NC, Greensville County, VA, Bertie County, NC, Southampton County, VA, Warren County, NC and Brunswick County, VA.

Products

Northampton County, Products

Testing a home in Northampton County

In Northampton County, 40.3% of 62 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 22.6% 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 Northampton County.

Test kits and monitors3

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Best radon monitors for Northampton County homes, compared

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Northampton County, Bordering counties

Counties bordering Northampton County

Calculated by Radon411

Northampton County, Cities and towns

Cities and towns in Northampton County

Northampton County has been losing residents: from 17,433 in 2020 to 16,491 on July 1, 2025, a fall of 5.4% by the Census Bureau's estimates. That works out to 31 people per square mile of land. No town dominates: Gaston, the largest, has 959 residents, 5.8% of the total. Together its 9 incorporated places hold 30.5% of those residents; the other 69.5% live outside any of them. Reported testing is thin here: 62 tests over 2008 to 2017, or 3.8 for every 1,000 residents (2025 estimate), where North Carolina as a whole comes to 6.5.

From Gaston to Lasker, CDC publishes no figure by town: each reads Northampton County's.

The cities and towns in Northampton County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Gaston959−5.2%5.8%
Garysburg860−5.6%5.2%
Rich Square835−6.2%5.1%
Conway707−5.9%4.3%
Woodland520−6.5%3.2%
Seaboard504−6.7%3.1%
Jackson410−4.2%2.5%
Severn177−5.9%1.1%
Lasker58−6.5%0.4%

9 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).

Northampton County, Homes

Homes in Northampton County

Of Northampton County's 10,620 homes, 66% are detached houses, against 65% across North Carolina; 28% 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. 73% 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 Northampton County, North Carolina, 2019 to 2023
HomesNorthampton CountyNorth Carolina
Housing units10,6204,815,195
Detached houses66%65%
In buildings of 5 or more1%14%
Mobile homes28%11%
Built before 196025%14%
Built since 200017%33%
Middle year built19791990
Owner-occupied73%66%

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