Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
Locations and reports
Radon Levels in Sampson County, North Carolina
EPA puts Sampson County in Zone 3, its lowest radon zone, and only 1 radon test from it is on file with CDC (2020). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
8.2%
Wayne County
- Wayne
- 8.2%
- Harnett
- 0.6%
4 of 7 neighbours have 30+ tests, 2008 to 2017
Nearest county
1.9%
Cumberland County, 26 miles
- Cumberland
- 1.9%
- NC
- 22.6%
Share at 4+ pCi/L, 160 tests, 2008 to 2017
Ground above low
None
34.2 pts below NC
- Sampson
- 0.0%
- NC
- 34.2%
Share of land USGS rates moderate or high potential
Tests reported
13
Too few for a share
- Sampson
- 13
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for Sampson County
Starts at EPA's action level
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
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 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.
The data
Sampson County, At a glance
Sampson County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
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 Sampson County, 2020
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2020 | 0.0% |
2020: 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 Sampson 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).
Sampson County, Compared
Sampson County radon figures, compared
Calculated by Radon411CDC's largest figure for Sampson County rests on 13 tests over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 7.7 points and no rank or comparison is drawn from it. Results reached as high as 1.1 pCi/L, with a middle value of 0.6 pCi/L.
Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Wayne County reported the largest share at or above 4 pCi/L, 8.2%, and Harnett County the smallest, 0.6%, with Johnston County at 8.2% and Cumberland County at 1.9% between. Farther out, Robeson County (48 miles away) at 3.8%, Columbus County (53 miles away) at 0.0% and Lee County (56 miles away) at 1.1% 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 Sampson 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.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Sampson County, Geology
The ground under Sampson County
PredictedUSGS's geologic map puts all of Sampson 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).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Inner Coastal Plain | Fossiliferous clay and sand, shelly sand, sandy marl, and limestone. | Low | 8 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Sampson County beside the ground around it
Across North Carolina 1.3% of the land is rated high; none of Sampson County's is. Of the 7 counties that border it, 2 have more moderate-potential ground, Johnston County the most at 30.9%.
The map rates the ground, not the air in any home.
Local help
Sampson County, Local resources
Radon testing and mitigation in Sampson County
- North Carolina Radon ProgramNorth Carolina Radon Program, run by NCDHHS, answers questions about testing, mitigation and the rules in North Carolina.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in North Carolina2 professionals are listed in North Carolina.
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
Sampson County, Questions
Questions about radon in Sampson County
Are radon levels high in Sampson County?
In 2020, 0.0% of the radon tests reported to CDC for Sampson County, North Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.6 pCi/L. Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Wayne County reported the largest share at or above 4 pCi/L, 8.2%, and Harnett County the smallest, 0.6%, with Johnston County at 8.2% and Cumberland County at 1.9% between.
Which counties border Sampson County?
Sampson County borders 7 counties: Bladen County, Duplin County, Cumberland County, Pender County, Wayne County, Johnston County and Harnett County.
Products
Sampson County, Products
Testing a home in Sampson County
No CDC figure names Sampson County; the nearest county with one, Cumberland County (26 miles away), reported 1.9% 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 Sampson County.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Monitor
Corentium Home 2 battery digital radon monitor
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Screen, app
Method: Alpha spectrometry
Readings: Every 60 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Sampson County, Bordering counties
Counties bordering Sampson County
Calculated by Radon411- Radon levels in Pender CountyEPA zone 3
11.8%at or above 4 pCi/L
Median 0.1 pCi/L · 17 tests
- Radon levels in Wayne CountyEPA zone 3
8.2%at or above 4 pCi/L
Median 0.6 pCi/L · 49 tests
- Radon levels in Johnston CountyEPA zone 3
8.2%at or above 4 pCi/L
Median 0.7 pCi/L · 668 tests
- Radon levels in Cumberland CountyEPA zone 3
1.9%at or above 4 pCi/L
Median 0.7 pCi/L · 160 tests
- Radon levels in Harnett CountyEPA zone 3
0.6%at or above 4 pCi/L
Median 0.6 pCi/L · 181 tests
- Radon levels in Bladen CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 14 tests
- Radon levels in Duplin CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 5 tests
Sampson County, Cities and towns
Cities and towns in Sampson County
The Census Bureau estimates 61,504 residents in Sampson County for July 1, 2025, 2,426 more than in 2020 (+4.1%). That works out to 65 people per square mile of land. No town dominates: Clinton, the largest, has 8,466 residents, 13.8% of the total. Reported testing is thin here: 13 tests over 2008 to 2017, or 0.2 for every 1,000 residents (2025 estimate), where North Carolina as a whole comes to 6.5.
From Clinton to Harrells, CDC publishes no figure by town: each reads Sampson County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Clinton | 8,466 | +1.2% | 13.8% |
| Roseboro | 1,189 | +3.4% | 1.9% |
| Faisonextends beyond Sampson County | 824 | +4.7% | Counted whole |
| Garland | 628 | +4.1% | 1.0% |
| Newton Grove | 600 | +3.1% | 1.0% |
| Salemburg | 470 | +2.8% | 0.8% |
| Falconextends beyond Sampson County | 385 | +19.2% | Counted whole |
| Turkey | 227 | +5.1% | 0.4% |
| Autryville | 171 | +3.6% | 0.3% |
| Harrellsextends beyond Sampson County | 169 | +3.7% | Counted whole |
10 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). A place that extends beyond Sampson County is counted whole, so it has no share.
Sampson County, Homes
Homes in Sampson County
Of Sampson County's 25,739 homes, 60% are detached houses, against 65% across North Carolina; 34% are mobile homes. Half of its homes were built before 1986, close to North Carolina's 1990: 17% date from before 1960 and 23% from 2000 or later. 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 | Sampson County | North Carolina |
|---|---|---|
| Housing units | 25,739 | 4,815,195 |
| Detached houses | 60% | 65% |
| In buildings of 5 or more | 3% | 14% |
| Mobile homes | 34% | 11% |
| Built before 1960 | 17% | 14% |
| Built since 2000 | 23% | 33% |
| Middle year built | 1986 | 1990 |
| Owner-occupied | 73% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.