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Radon Levels in Robeson County, North Carolina

EPA puts Robeson 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

    3.8%

    18.8 pts below NC

    Robeson
    3.8%
    NC
    22.6%

    53 tests, 2008 to 2017

  • Median result

    0.8pCi/L

    Below action level

    Robeson
    0.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    53

    67th of 75 by tests

    Robeson
    53
    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

    61 of 75

    Lowest quarter

    Robeson
    3.8%
    Transylvania
    47.8%

    By share, of 75 with 30+ tests

Read a result for Robeson County

Starts at Robeson County's median, 0.8 pCi/L

0.8pCi/L

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

EPA’s reading of 0.8 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. Robeson County's median reported result, 2008 to 2017.

Interpret this reading

The data

Robeson County, At a glance

Robeson County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Robeson 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 Robeson County, 2022

Share of reported tests at or above 4 pCi/L, by year, Robeson County
Share of reported tests at or above 4 pCi/L, by year, Robeson County
YearShare of reported tests at or above 4 pCi/L
20140.0%
20200.0%
20210.0%
20220.0%

2022: 0.0%. Across these years the share ran from 0.0% to 0.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 1 test was reported to CDC for Robeson 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

Robeson County, Compared

Robeson County radon figures, compared

Calculated by Radon411

Only 2 of 53 radon tests reported for Robeson County over the 2008 to 2017 laboratory totals reached 4 pCi/L (3.8%). The median result, 0.8 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 9.1 pCi/L.

The newest figure, in 2022, counts only 1 test (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 53-test figure.

Across 99 North Carolina counties pooled together, 22.6% of tests reached that level, so Robeson County runs 18.8 points below its state. Against the national pool of 35.7%, the gap is 31.9 points lower. Its place in the state: 61st of 75 North Carolina counties with 30 or more tests for the same period.

Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 3.8% share point the same way here. Of 4 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 0.0% (Columbus County) to 3.2% (Scotland County).

Below the action level, 43 tests (81.1%) came in under 2 pCi/L, against 55.6% statewide, and 8 tests (15.1%) fell between 2 and 4, against 21.8% statewide. USGS geology rates 100% of the county's land low radon potential.

The busiest year on file was 2020, with 15 tests reported; the quietest, 2022, had 1.

Robeson County against North Carolina, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Robeson County
Robeson County533.8%0.8 pCi/LThis county
North Carolina, pooled99 counties, pooled73,13922.6%Not pooled+18.8 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+31.9 points
Transylvania Countyhighest in the state3,86247.8%3.7 pCi/L+44.0 points
Nash Countylowest in the state300.0%0.2 pCi/L−3.8 points
Scotland County, NCborders it313.2%1.0 pCi/L−0.6 points
Cumberland County, NCborders it1601.9%0.7 pCi/L−1.9 points
Horry County, SCborders it1060.9%0.6 pCi/L−2.9 points
Bladen County, NCborders it140.0%0.1 pCi/L−3.8 points
Dillon County, SCborders it180.0%0.3 pCi/L−3.8 points
Hoke County, NCborders it190.0%0.8 pCi/L−3.8 points
Columbus County, NCborders it310.0%0.1 pCi/L−3.8 points
Marlboro County, SCborders it70.0%0.9 pCi/L−3.8 points
Where Robeson County's reported results fell, 2008 to 2017, laboratory, beside North Carolina and the United States
ResultRobeson County testsRobeson County shareNorth Carolina shareU.S. shareAgainst North Carolina
Under 2 pCi/L4381.1%55.6%39.6%+25.5 points
2 to 4 pCi/L815.1%21.8%24.7%−6.7 points
4 pCi/L and above23.8%22.6%35.7%−18.8 points
Robeson 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
Johnston County56 of 756688.2%0.7 pCi/L
Wayne County57 of 75498.2%0.6 pCi/L
Guilford County58 of 756,8707.9%0.9 pCi/L
Randolph County59 of 754227.1%0.9 pCi/L
Durham County60 of 751,5704.3%0.7 pCi/L
Robeson County61 of 75533.8%0.8 pCi/L
Alamance County62 of 755203.7%0.5 pCi/L
New Hanover County63 of 751173.4%0.1 pCi/L
Scotland County64 of 75313.2%1.0 pCi/L
Onslow County65 of 751882.7%0.5 pCi/L
Cumberland County66 of 751601.9%0.7 pCi/L
Robeson County radon tests by year, against North Carolina's pooled share
YearTestsAt or above 4 pCi/LMedianHighestNorth Carolina, pooledChange from the row before
202210.0%0.1 pCi/L0.1 pCi/L10.7%Level
202160.0%0.1 pCi/L1.0 pCi/L14.9%Level
2020150.0%0.1 pCi/L1.2 pCi/L21.1%Level
201430.0%0.1 pCi/L1.9 pCi/L21.9%First on file

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

Robeson County, Geology

The ground under Robeson County

Predicted

USGS's geologic map puts all of Robeson County's mapped land in one class: low radon potential. 99.5% 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 Robeson County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Inner Coastal PlainFossiliferous clay and sand, shelly sand, sandy marl, and limestone.Low899.5%
Upper and Middle Coastal PlainTertiary coastal plain sandy and silty sediments and marsh deposits.Low80.5%

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

Robeson County beside the ground around it

Across North Carolina 1.3% of the land is rated high; none of Robeson County's is. None of the 8 counties that border it has any moderate-potential ground either.

Share of land by USGS radon potential: Robeson County, the 8 counties bordering it and North Carolina
AreaEPA zoneLow potentialModerate potentialHigh potential
Robeson CountyZone 3100%NoneNone
Dillon County, SCZone 3100%NoneNone
Scotland CountyZone 3100%NoneNone
Hoke CountyZone 3100%NoneNone
Marlboro County, SCZone 3100%NoneNone
Bladen CountyZone 3100%NoneNone
Cumberland CountyZone 3100%NoneNone
Columbus CountyZone 3100%NoneNone
Horry County, SCZone 399.6%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

Robeson County, Local resources

Radon testing and mitigation in Robeson 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

Robeson County, Questions

Questions about radon in Robeson County

Are radon levels high in Robeson County?

In 2022, 0.0% of the radon tests reported to CDC for Robeson 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, 60 reported a higher share; pooled, the state comes to 22.6%.

Which counties border Robeson County?

Robeson County borders 8 counties: Dillon County, SC, Scotland County, NC, Hoke County, NC, Marlboro County, SC, Bladen County, NC, Cumberland County, NC, Columbus County, NC and Horry County, SC.

Products

Robeson County, Products

Testing a home in Robeson County

In Robeson County, 3.8% of 53 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 Robeson County.

Test kits and monitors3

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Best radon monitors for Robeson County homes, compared

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Robeson County, Bordering counties

Counties bordering Robeson County

Calculated by Radon411

Robeson County, Cities and towns

Cities and towns in Robeson County

The Census Bureau estimates 119,941 residents in Robeson County for July 1, 2025, 3,961 more than in 2020 (+3.4%). That works out to 127 people per square mile of land. No town dominates: Lumberton, the largest, has 18,955 residents, 15.8% of the total. Reported testing is thin here: 53 tests over 2008 to 2017, or 0.4 for every 1,000 residents (2025 estimate), where North Carolina as a whole comes to 6.5.

From Lumberton to Orrum, CDC publishes no figure by town: each reads Robeson County's.

The 12 largest cities and towns in Robeson County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Lumberton18,955+0.3%15.8%
Red Springsextends beyond Robeson County3,216+4.2%Counted whole
Pembroke2,888+2.7%2.4%
Fairmont2,231+2.0%1.9%
Maxtonextends beyond Robeson County2,149+2.2%Counted whole
St. Pauls2,109+2.8%1.8%
Rowland906+2.3%0.8%
Parkton514+2.8%0.4%
Rennert294+5.4%0.2%
Proctorville122+2.5%0.1%
Marietta111+3.7%Under 0.1%
McDonald95+2.2%Under 0.1%
  • Lumber Bridge
  • Raynham
  • Orrum

15 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Robeson County is counted whole, so it has no share.

Robeson County, Homes

Homes in Robeson County

Mobile homes are 38% of Robeson County's 48,874 homes and detached houses 51%, against 65% across North Carolina. Half of its homes were built before 1985, close to North Carolina's 1990: 15% date from before 1960 and 20% from 2000 or later. 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 Robeson County, North Carolina, 2019 to 2023
HomesRobeson CountyNorth Carolina
Housing units48,8744,815,195
Detached houses51%65%
In buildings of 5 or more4%14%
Mobile homes38%11%
Built before 196015%14%
Built since 200020%33%
Middle year built19851990
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.