Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Duplin County, North Carolina
EPA puts Duplin 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%
- Onslow
- 2.7%
2 of 6 neighbours have 30+ tests, 2008 to 2017
Nearest county
8.2%
Wayne County, 30 miles
- Wayne
- 8.2%
- NC
- 22.6%
Share at 4+ pCi/L, 49 tests, 2008 to 2017
Ground above low
None
34.2 pts below NC
- Duplin
- 0.0%
- NC
- 34.2%
Share of land USGS rates moderate or high potential
Tests reported
8
Too few for a share
- Duplin
- 8
- Needed
- 30
2007 to 2016, 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 Duplin 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
Duplin County, At a glance
Duplin 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 Duplin County, 2020
CDC holds 1 reported test for Duplin County in 2020, a result of 0.8 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Duplin County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for Duplin 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).
Duplin County, Compared
Duplin County radon figures, compared
Calculated by Radon411CDC's largest figure for Duplin County rests on 8 tests over the 2007 to 2016 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 12.5 points and no rank or comparison is drawn from it. Results reached as high as 0.9 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: Wayne County reported the largest share at or above 4 pCi/L, 8.2%, and Onslow County the smallest, 2.7%. Farther out, Johnston County (47 miles away) at 8.2%, New Hanover County (49 miles away) at 3.4% and Craven County (49 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 Duplin 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.
Duplin County, Geology
The ground under Duplin County
PredictedUSGS's geologic map puts all of Duplin 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.
Duplin County beside the ground around it
Across North Carolina 1.3% of the land is rated high; none of Duplin County's is. None of the 6 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Duplin County, Local resources
Radon testing and mitigation in Duplin 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
Duplin County, Questions
Questions about radon in Duplin County
Are radon levels high in Duplin County?
In 2020, 0.0% of the radon tests reported to CDC for Duplin County, North Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.8 pCi/L. Of the counties bordering it, 2 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 Onslow County the smallest, 2.7%.
Which counties border Duplin County?
Duplin County borders 6 counties: Lenoir County, Sampson County, Jones County, Pender County, Wayne County and Onslow County.
Products
Duplin County, Products
Testing a home in Duplin County
No CDC figure names Duplin County; the nearest county with one, Wayne County (30 miles away), reported 8.2% 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 Duplin County.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
MonitorINKBIRD
INK-RD3 battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Duplin County, Bordering counties
Counties bordering Duplin 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 Onslow CountyEPA zone 3
2.7%at or above 4 pCi/L
Median 0.5 pCi/L · 188 tests
- Radon levels in Lenoir CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 15 tests
- Radon levels in Sampson CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 13 tests
- Radon levels in Jones CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.8 pCi/L · 1 test
Duplin County, Cities and towns
Cities and towns in Duplin County
Duplin County is growing: the Census Bureau puts it at 51,571 residents on July 1, 2025, up 6.0% from 48,660 in 2020. That works out to 63 people per square mile of land. Mount Olive, the largest place on its list (4,521 residents in all), extends beyond Duplin County, so no share of the total is worked out for it. Reported testing is thin here: 8 tests over 2007 to 2016, or 0.2 for every 1,000 residents (2025 estimate), where North Carolina as a whole comes to 6.3.
From Mount Olive to Harrells, CDC publishes no figure by town: each reads Duplin County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Mount Oliveextends beyond Duplin County | 4,521 | +2.9% | Counted whole |
| Wallaceextends beyond Duplin County | 3,570 | +5.7% | Counted whole |
| Warsaw | 2,853 | +4.9% | 5.5% |
| Rose Hill | 1,429 | +4.6% | 2.8% |
| Beulaville | 1,176 | +5.6% | 2.3% |
| Magnolia | 875 | +5.8% | 1.7% |
| Faisonextends beyond Duplin County | 824 | +4.7% | Counted whole |
| Kenansville | 814 | +6.0% | 1.6% |
| Greenevers | 603 | +6.5% | 1.2% |
| Teachey | 500 | +5.3% | 1.0% |
| Calypso | 340 | +5.3% | 0.7% |
| Harrellsextends beyond Duplin County | 169 | +3.7% | Counted whole |
12 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 Duplin County is counted whole, so it has no share.
Duplin County, Homes
Homes in Duplin County
Of Duplin County's 23,823 homes, 60% are detached houses, against 65% across North Carolina; 32% are mobile homes. Half of its homes were built before 1987, close to North Carolina's 1990: 18% date from before 1960 and 26% from 2000 or later. 70% 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 | Duplin County | North Carolina |
|---|---|---|
| Housing units | 23,823 | 4,815,195 |
| Detached houses | 60% | 65% |
| In buildings of 5 or more | 3% | 14% |
| Mobile homes | 32% | 11% |
| Built before 1960 | 18% | 14% |
| Built since 2000 | 26% | 33% |
| Middle year built | 1987 | 1990 |
| Owner-occupied | 70% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.