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Radon Levels in Bertie County, North Carolina

EPA puts Bertie County in Zone 3, its lowest radon zone, and only 5 radon tests from it are on file with CDC (2020). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Highest bordering

    42.4%

    Halifax County

    Halifax
    42.4%
    Northampton
    40.3%

    2 of 5 neighbours have 30+ tests, 2008 to 2017

  • Nearest county

    40.3%

    Northampton County, 34 miles

    Northampton
    40.3%
    NC
    22.6%

    Share at 4+ pCi/L, 62 tests, 2008 to 2017

  • Ground above low

    None

    34.2 pts below NC

    Bertie
    0.0%
    NC
    34.2%

    Share of land USGS rates moderate or high potential

  • Tests reported

    5

    Too few for a share

    Bertie
    5
    Needed
    30

    2020

  • 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

Read a result for Bertie County

Starts at EPA's action level

4.0pCi/L

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

EPA’s reading of 4.0 pCi/L

At or above 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 at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.

Interpret this readingWhat a fix costs

The data

Bertie County, At a glance

Bertie County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Bertie 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Bertie County, 2020

CDC holds 5 reported tests for Bertie County in 2020, with a median of 0.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Bertie County beside the counties around it is how this page reads it.

What these figures count

Only 5 tests were reported to CDC for Bertie County over 2020, 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: 2020. Measured data period: 2005 to 2020 (every CDC figure on file).

How to read these figures

Bertie County, Compared

Bertie County radon figures, compared

Calculated by Radon411

CDC's largest figure for Bertie County rests on 5 tests in 2020, 0 of them at or above 4 pCi/L, so each test moves its share by 20.0 points and no rank or comparison is drawn from it. Results reached as high as 0.1 pCi/L, with a middle value of 0.1 pCi/L.

Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Halifax County reported the largest share at or above 4 pCi/L, 42.4%, and Northampton County the smallest, 40.3%. Farther out, Pitt County (39 miles away) at 1.0%, Nash County (57 miles away) at 0.0% and Craven County (65 miles away) at 0.0% have figures too. Pooled across 99 North Carolina counties, 22.6% of reported tests reached that level; across every county in the country with a figure, 35.7%.

Statewide for the same period, Transylvania County reported the highest share (47.8%) and Nash County the lowest (0.0%). EPA's 1993 map puts Bertie County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.

North Carolina, the United States and the counties around Bertie County, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedian
North Carolina, pooled99 counties, pooled73,13922.6%Not pooled
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled
Transylvania Countyhighest in the state3,86247.8%3.7 pCi/L
Nash Countylowest in the state300.0%0.2 pCi/L
Halifax County, NCborders it5942.4%2.6 pCi/L
Northampton County, NCborders it6240.3%3.4 pCi/L
Hertford County, NCborders it20.0%0.4 pCi/L
Washington County, NCborders it10.0%0.1 pCi/L
Martin County, NCborders it40.0%0.6 pCi/L
The nearest North Carolina counties to Bertie County with 30 or more tests, 2008 to 2017, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Northampton County34 mi6240.3%3.4 pCi/L
Pitt County39 mi1011.0%0.1 pCi/L
Halifax County40 mi5942.4%2.6 pCi/L
Nash County57 mi300.0%0.2 pCi/L
Craven County65 mi1090.0%0.2 pCi/L
Warren County67 mi8242.7%3.0 pCi/L
Dare County69 mi4126.8%0.1 pCi/L
Franklin County73 mi20419.1%1.4 pCi/L
Bertie County ten-year laboratory totals, against North Carolina's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestNorth Carolina, pooledChange from the row before
2008 to 2017425.0%1.1 pCi/L6.9 pCi/L22.6%Level
2007 to 2016425.0%1.1 pCi/L6.9 pCi/L23.2%Level
2006 to 2015425.0%1.1 pCi/L6.9 pCi/L24.1%+25.0 points
2005 to 201430.0%1.1 pCi/L1.2 pCi/L24.0%First on file

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

Bertie County, Geology

The ground under Bertie County

Predicted

USGS's geologic map puts all of Bertie County's mapped land in one class: low radon potential. All of it lies in the area the map calls Inner Coastal Plain, to which USGS gives a radon index of 8, in the low band (5 to 8).

USGS's geologic areas under Bertie County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Inner Coastal PlainFossiliferous clay and sand, shelly sand, sandy marl, and limestone.Low899.8%

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

Bertie County beside the ground around it

Across North Carolina 1.3% of the land is rated high; none of Bertie County's is. Of the 5 counties that border it, 2 have more moderate-potential ground, Halifax County the most at 10.2%.

Share of land by USGS radon potential: Bertie County, the 5 counties bordering it and North Carolina
AreaEPA zoneLow potentialModerate potentialHigh potential
Bertie CountyZone 399.8%NoneNone
Martin CountyZone 3100%NoneNone
Hertford CountyZone 399.1%NoneNone
Washington CountyZone 399.9%NoneNone
Northampton CountyZone 397.5%2.5%None
Halifax CountyZone 389.8%10.2%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

Bertie County, Local resources

Radon testing and mitigation in Bertie 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

Bertie County, Questions

Questions about radon in Bertie County

Are radon levels high in Bertie County?

In 2020, 0.0% of the radon tests reported to CDC for Bertie County, North Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Halifax County reported the largest share at or above 4 pCi/L, 42.4%, and Northampton County the smallest, 40.3%.

Which counties border Bertie County?

Bertie County borders 5 counties: Martin County, Hertford County, Washington County, Northampton County and Halifax County.

Products

Bertie County, Products

Testing a home in Bertie County

No CDC figure names Bertie County; the nearest county with one, Northampton County (34 miles away), reported 40.3% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. 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 Bertie County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Bertie County homes, compared

Explore

Bertie County, Bordering counties

Counties bordering Bertie County

Calculated by Radon411

Bertie County, Cities and towns

Cities and towns in Bertie County

About 17,086 people live in Bertie County by the Census Bureau's estimate for July 1, 2025, 636 fewer than in 2020 (−3.6%). That works out to 24 people per square mile of land. Its largest town, Windsor, has 3,469 residents, 20.3% of the total. Together its 8 incorporated places hold 32.3% of those residents; the other 67.7% live outside any of them. Reported testing is thin here: 5 tests over 2020, or 0.3 for every 1,000 residents (2025 estimate), where North Carolina as a whole comes to 1.0.

From Windsor to Askewville, CDC publishes no figure by town: each reads Bertie County's.

The cities and towns in Bertie County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Windsor3,469+1.3%20.3%
Aulander715−5.7%4.2%
Lewiston Woodville405−5.8%2.4%
Kelford204−3.8%1.2%
Colerain198−6.6%1.2%
Powellsville180−5.3%1.1%
Roxobel176−3.8%1.0%
Askewville171−5.5%1.0%

8 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).

Bertie County, Homes

Homes in Bertie County

Of Bertie County's 8,988 homes, 66% are detached houses, against 65% across North Carolina; 31% are mobile homes. The homes are older than North Carolina's as a whole: half were built before 1980 (1990 for North Carolina), and 21% date from before 1960. 74% 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 Bertie County, North Carolina, 2019 to 2023
HomesBertie CountyNorth Carolina
Housing units8,9884,815,195
Detached houses66%65%
In buildings of 5 or more1%14%
Mobile homes31%11%
Built before 196021%14%
Built since 200018%33%
Middle year built19801990
Owner-occupied74%66%

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