Skip to content
RADON411

Locations and reports

Radon Levels in Hertford County, North Carolina

EPA puts Hertford County in Zone 3, its lowest radon zone, and only 2 radon tests from it are on file with CDC (2014). 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

    40.3%

    Northampton County

    Northampton
    40.3%

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

  • Nearest county

    40.3%

    Northampton County, 23 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

    Hertford
    0.0%
    NC
    34.2%

    Share of land USGS rates moderate or high potential

  • Tests reported

    2

    Too few for a share

    Hertford
    2
    Needed
    30

    2014

  • 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 Hertford 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

Hertford County, At a glance

Hertford County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Hertford 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 99% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Hertford County, 2014

CDC holds 2 reported tests for Hertford County in 2014, with a median of 0.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Hertford County beside the counties around it is how this page reads it.

What these figures count

Only 2 tests were reported to CDC for Hertford County over 2014, 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: 2014. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Hertford County, Compared

Hertford County radon figures, compared

Calculated by Radon411

CDC's largest figure for Hertford County rests on 2 tests in 2014, 0 of them at or above 4 pCi/L, so each test moves its share by 50.0 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.

Northampton County, the one bordering county with a figure over the 2008 to 2017 laboratory totals, reported 40.3% of its tests at or above 4 pCi/L. Farther out, Halifax County (38 miles away) at 42.4%, Pitt County (57 miles away) at 1.0% and Nash County (62 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 Hertford County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 99% of the county's land low radon potential.

North Carolina, the United States and the counties around Hertford 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
Northampton County, NCborders it6240.3%3.4 pCi/L
Bertie County, NCborders it425.0%1.1 pCi/L
Chowan County, NCborders it90.0%0.1 pCi/L
Gates County, NCborders it10.0%0.1 pCi/L
Southampton County, VAborders it20.0%1.1 pCi/L
The nearest North Carolina counties to Hertford County with 30 or more tests, 2008 to 2017, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Northampton County23 mi6240.3%3.4 pCi/L
Halifax County38 mi5942.4%2.6 pCi/L
Pitt County57 mi1011.0%0.1 pCi/L
Nash County62 mi300.0%0.2 pCi/L
Warren County63 mi8242.7%3.0 pCi/L
Franklin County75 mi20419.1%1.4 pCi/L
Dare County77 mi4126.8%0.1 pCi/L
Vance County80 mi10914.7%1.5 pCi/L
Hertford 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 201720.0%0.4 pCi/L0.6 pCi/L22.6%Level
2007 to 201620.0%0.4 pCi/L0.6 pCi/L23.2%Level
2006 to 201520.0%0.4 pCi/L0.6 pCi/L24.1%Level
2005 to 201410.0%0.6 pCi/L0.6 pCi/L24.0%First on file

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

Hertford County, Geology

The ground under Hertford County

Predicted

USGS's geologic map puts all of Hertford County's mapped land in one class: low radon potential. 99.1% 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 Hertford County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Inner Coastal PlainFossiliferous clay and sand, shelly sand, sandy marl, and limestone.Low899.1%

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

Hertford County beside the ground around it

Across North Carolina 1.3% of the land is rated high; none of Hertford County's is. Of the 5 counties that border it, 1 has more moderate-potential ground, Northampton County the most at 2.5%.

Share of land by USGS radon potential: Hertford County, the 5 counties bordering it and North Carolina
AreaEPA zoneLow potentialModerate potentialHigh potential
Hertford CountyZone 399.1%NoneNone
Gates CountyZone 398.9%NoneNone
Northampton CountyZone 397.5%2.5%None
Bertie CountyZone 399.8%NoneNone
Chowan CountyZone 397.3%NoneNone
Southampton County, VAZone 3100%NoneNone
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

Hertford County, Local resources

Radon testing and mitigation in Hertford 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

Hertford County, Questions

Questions about radon in Hertford County

Are radon levels high in Hertford County?

In 2014, 0.0% of the radon tests reported to CDC for Hertford County, North Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Northampton County, the one bordering county with a figure over the 2008 to 2017 laboratory totals, reported 40.3% of its tests at or above 4 pCi/L.

Which counties border Hertford County?

Hertford County borders 5 counties: Gates County, NC, Northampton County, NC, Bertie County, NC, Chowan County, NC and Southampton County, VA.

Products

Hertford County, Products

Testing a home in Hertford County

No CDC figure names Hertford County; the nearest county with one, Northampton County (23 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 Hertford County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Hertford County homes, compared

Explore

Hertford County, Bordering counties

Counties bordering Hertford County

Calculated by Radon411

Hertford County, Cities and towns

Cities and towns in Hertford County

Hertford County has been losing residents: from 21,414 in 2020 to 19,015 on July 1, 2025, a fall of 11.2% by the Census Bureau's estimates. That works out to 54 people per square mile of land. Its largest town, Ahoskie, has 4,608 residents, 24.2% of the total. Together its 6 incorporated places hold 41.2% of those residents; the other 58.8% live outside any of them. Reported testing is thin here: 2 tests over 2014, or 0.1 for every 1,000 residents (2025 estimate), where North Carolina as a whole comes to 1.0.

From Ahoskie to Como, CDC publishes no figure by town: each reads Hertford County's.

The cities and towns in Hertford County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Ahoskie4,608−5.1%24.2%
Murfreesboro2,242−13.9%11.8%
Winton592−5.3%3.1%
Cofield258−3.4%1.4%
Harrellsville80−4.8%0.4%
Como61−4.7%0.3%

6 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).

Hertford County, Homes

Homes in Hertford County

Of Hertford County's 9,831 homes, 67% are detached houses, against 65% across North Carolina; 21% are mobile homes. The homes are older than North Carolina's as a whole: half were built before 1976 (1990 for North Carolina), and 25% date from before 1960. 66% 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 Hertford County, North Carolina, 2019 to 2023
HomesHertford CountyNorth Carolina
Housing units9,8314,815,195
Detached houses67%65%
In buildings of 5 or more3%14%
Mobile homes21%11%
Built before 196025%14%
Built since 200015%33%
Middle year built19761990
Owner-occupied66%66%

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