Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Martin County, North Carolina
EPA puts Martin County in Zone 3, its lowest radon zone, and only 4 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
Highest bordering
42.4%
Halifax County
- Halifax
- 42.4%
- Pitt
- 1.0%
2 of 6 neighbours have 30+ tests, 2008 to 2017
Nearest county
1.0%
Pitt County, 23 miles
- Pitt
- 1.0%
- NC
- 22.6%
Share at 4+ pCi/L, 101 tests, 2008 to 2017
Ground above low
None
34.2 pts below NC
- Martin
- 0.0%
- NC
- 34.2%
Share of land USGS rates moderate or high potential
Tests reported
5
Too few for a share
- Martin
- 5
- 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 Martin 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
Martin County, At a glance
Martin 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 Martin County, 2020
CDC holds 4 reported tests for Martin County in 2020, with a median of 0.3 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Martin County beside the counties around it is how this page reads it.
What these figures count
Only 4 tests were reported to CDC for Martin 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).
Martin County, Compared
Martin County radon figures, compared
Calculated by Radon411CDC's largest figure for Martin County rests on 5 tests over the 2007 to 2016 laboratory totals, 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 1.1 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 Pitt County the smallest, 1.0%. Farther out, Northampton County (43 miles away) at 40.3%, Craven County (50 miles away) at 0.0% and Nash County (50 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 Martin 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.
Martin County, Geology
The ground under Martin County
PredictedUSGS's geologic map puts all of Martin 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.
Martin County beside the ground around it
Across North Carolina 1.3% of the land is rated high; none of Martin County's is. Of the 6 counties that border it, 1 has more moderate-potential ground, Halifax County the most at 10.2%.
The map rates the ground, not the air in any home.
Local help
Martin County, Local resources
Radon testing and mitigation in Martin 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
Martin County, Questions
Questions about radon in Martin County
Are radon levels high in Martin County?
In 2020, 0.0% of the radon tests reported to CDC for Martin County, North Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.3 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 Pitt County the smallest, 1.0%.
Which counties border Martin County?
Martin County borders 6 counties: Bertie County, Pitt County, Edgecombe County, Washington County, Beaufort County and Halifax County.
Products
Martin County, Products
Testing a home in Martin County
No CDC figure names Martin County; the nearest county with one, Pitt County (23 miles away), reported 1.0% 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 Martin 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
MonitorSafetySiren
Pro4 plug-in radon detector with a display and alarm
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 48 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Martin County, Bordering counties
Counties bordering Martin County
Calculated by Radon411- Radon levels in Halifax CountyEPA zone 3
42.4%at or above 4 pCi/L
Median 2.6 pCi/L · 59 tests
- Radon levels in Bertie CountyEPA zone 3
25.0%at or above 4 pCi/L
Median 1.1 pCi/L · 4 tests
- Radon levels in Pitt CountyEPA zone 3
1.0%at or above 4 pCi/L
Median 0.1 pCi/L · 101 tests
- Radon levels in Edgecombe CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 9 tests
- Radon levels in Washington CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 1 test
- Radon levels in Beaufort CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 23 tests
Martin County, Cities and towns
Cities and towns in Martin County
About 21,601 people live in Martin County by the Census Bureau's estimate for July 1, 2025, 353 fewer than in 2020 (−1.6%). That works out to 47 people per square mile of land. Its largest town, Williamston, has 5,086 residents, 23.5% of the total. Together its 9 incorporated places hold 36.2% of those residents; the other 63.8% live outside any of them. Reported testing is thin here: 5 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 Williamston to Hassell, CDC publishes no figure by town: each reads Martin County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Williamston | 5,086 | −2.6% | 23.5% |
| Robersonville | 1,237 | −2.8% | 5.7% |
| Jamesville | 411 | −2.1% | 1.9% |
| Hamilton | 297 | −2.0% | 1.4% |
| Oak City | 266 | −2.2% | 1.2% |
| Parmele | 246 | Level | 1.1% |
| Everetts | 144 | −1.4% | 0.7% |
| Bear Grass | 81 | −4.7% | 0.4% |
| Hassell | 47 | −2.1% | 0.2% |
9 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).
Martin County, Homes
Homes in Martin County
Of Martin County's 11,100 homes, 68% are detached houses, against 65% across North Carolina; 22% are mobile homes. The homes are older than North Carolina's as a whole: half were built before 1976 (1990 for North Carolina), and 29% date from before 1960. 68% 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 | Martin County | North Carolina |
|---|---|---|
| Housing units | 11,100 | 4,815,195 |
| Detached houses | 68% | 65% |
| In buildings of 5 or more | 3% | 14% |
| Mobile homes | 22% | 11% |
| Built before 1960 | 29% | 14% |
| Built since 2000 | 19% | 33% |
| Middle year built | 1976 | 1990 |
| Owner-occupied | 68% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.