Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Brunswick County, North Carolina
EPA puts Brunswick County in Zone 3, its lowest radon zone, and only 8 radon tests from it are on file with CDC (2021). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
0.0%
22.6 pts below NC
- Brunswick
- 0.0%
- NC
- 22.6%
62 tests, 2008 to 2017
Median result
0.5pCi/L
Below action level
- Brunswick
- 0.5 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
62
65th of 75 by tests
- Brunswick
- 62
- Wake
- 9,694
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Rank in NC
70 of 75
Lowest quarter
- Brunswick
- 0.0%
- Transylvania
- 47.8%
By share, of 75 with 30+ tests
Read a result for Brunswick County
Starts at Brunswick County's median, 0.5 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.5 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Brunswick County's median reported result, 2008 to 2017.
The data
Brunswick County, At a glance
Brunswick County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 93% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Brunswick County, 2021
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2020 | 0.0% |
| 2021 | 0.0% |
2021: 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 8 tests were reported to CDC for Brunswick County over 2021, 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: 2021. Measured data period: 2005 to 2021 (every CDC figure on file).
Brunswick County, Compared
Brunswick County radon figures, compared
Calculated by Radon411Only 0 of 62 radon tests reported for Brunswick County over the 2008 to 2017 laboratory totals reached 4 pCi/L (0.0%). The median result, 0.5 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 3.6 pCi/L.
The newest figure, in 2021, counts only 8 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 62-test figure.
Across 99 North Carolina counties pooled together, 22.6% of tests reached that level, so Brunswick County runs 22.6 points below its state. Against the national pool of 35.7%, the gap is 35.7 points lower. Its place in the state: 70th 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 0.0% share point the same way here. Of 3 neighbours with a figure, all 3 reported a larger share at or above 4 pCi/L; the spread is 0.0% (Columbus County) to 3.4% (New Hanover County).
Below the action level, 56 tests (90.3%) came in under 2 pCi/L, against 55.6% statewide, and 6 tests (9.7%) fell between 2 and 4, against 21.8% statewide. USGS geology rates 93% of the county's land low radon potential.
The busiest year on file was 2020, with 17 tests reported; the quietest, 2021, had 8.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Brunswick County, Geology
The ground under Brunswick County
PredictedUSGS's geologic map puts all of Brunswick County's mapped land in one class: low radon potential. The map puts 48.9% of Brunswick County in the area it calls Outer Coastal Plain and 44.6% in Inner Coastal Plain. USGS gives the first a radon index of 7 and the second 8, both in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Outer Coastal Plain | Unconsolidated sand. | Low | 7 | 48.9% |
| Inner Coastal Plain | Fossiliferous clay and sand, shelly sand, sandy marl, and limestone. | Low | 8 | 44.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Brunswick County beside the ground around it
Across North Carolina 1.3% of the land is rated high; none of Brunswick County's is. None of the 4 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Brunswick County, Local resources
Radon testing and mitigation in Brunswick 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
Brunswick County, Questions
Questions about radon in Brunswick County
Are radon levels high in Brunswick County?
In 2021, 0.0% of the radon tests reported to CDC for Brunswick 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, 69 reported a higher share; pooled, the state comes to 22.6%.
Which counties border Brunswick County?
Brunswick County borders 4 counties: New Hanover County, NC, Columbus County, NC, Pender County, NC and Horry County, SC.
Products
Brunswick County, Products
Testing a home in Brunswick County
In Brunswick County, 0.0% of 62 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 Brunswick 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
Monitor
lüft plug-in radon and indoor air quality monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi, Bluetooth
- App only
First reading: Within 90 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Brunswick County, Bordering counties
Counties bordering Brunswick County
Calculated by Radon411- Radon levels in Pender County, NCEPA zone 3
11.8%at or above 4 pCi/L
Median 0.1 pCi/L · 17 tests · 11.8 points above Brunswick County
- Radon levels in New Hanover County, NCEPA zone 3
3.4%at or above 4 pCi/L
Median 0.1 pCi/L · 117 tests · 3.4 points above Brunswick County
- Radon levels in Horry County, SCEPA zone 3
0.9%at or above 4 pCi/L
Median 0.6 pCi/L · 106 tests · 0.9 points above Brunswick County
- Radon levels in Columbus County, NCEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 31 tests · 0.0 points above Brunswick County
Brunswick County, Cities and towns
Cities and towns in Brunswick County
Brunswick County is growing: the Census Bureau puts it at 174,702 residents on July 1, 2025, up 26.5% from 138,135 in 2020. That works out to 206 people per square mile of land. Its largest town, Leland, has 35,731 residents, 20.5% of the total. Together its 19 incorporated places hold 52.7% of those residents; the other 47.3% live outside any of them. Reported testing is thin here: 62 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 Leland to Bolivia, CDC publishes no figure by town: each reads Brunswick County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Leland | 35,731 | +42.1% | 20.5% |
| Oak Island | 9,337 | +11.3% | 5.3% |
| St. James | 7,318 | +11.8% | 4.2% |
| Boiling Spring Lakes | 6,875 | +16.5% | 3.9% |
| Carolina Shores | 5,540 | +21.5% | 3.2% |
| Shallotte | 5,335 | +28.0% | 3.1% |
| Sunset Beach | 4,642 | +11.8% | 2.7% |
| Southport | 4,434 | +11.3% | 2.5% |
| Belville | 3,199 | +34.6% | 1.8% |
| Calabash | 3,069 | +54.5% | 1.8% |
| Navassa | 1,889 | +36.4% | 1.1% |
| Northwest | 1,096 | +58.2% | 0.6% |
- Ocean Isle Beach
- Holden Beach
- Varnamtown
- Caswell Beach
- Sandy Creek
- Bald Head Island
- Bolivia
19 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).
Brunswick County, Homes
Homes in Brunswick County
Of Brunswick County's 93,977 homes, 69% are detached houses, against 65% across North Carolina; 18% are mobile homes. Much of Brunswick County is recent building: 53% of its homes have gone up since 2000 and the middle year built is 2001, against 1990 for North Carolina. Owners live in 84% of the occupied homes (North Carolina: 66%), so for most households a test and a fix are their own to order.
| Homes | Brunswick County | North Carolina |
|---|---|---|
| Housing units | 93,977 | 4,815,195 |
| Detached houses | 69% | 65% |
| In buildings of 5 or more | 7% | 14% |
| Mobile homes | 18% | 11% |
| Built before 1960 | 3% | 14% |
| Built since 2000 | 53% | 33% |
| Middle year built | 2001 | 1990 |
| Owner-occupied | 84% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.