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 Alexander County, North Carolina
EPA puts Alexander County in Zone 2, its middle radon zone, and only 2 radon tests from it are on file with CDC (2022). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
32.8%
10.2 pts above NC
- Alexander
- 32.8%
- NC
- 22.6%
311 tests, 2008 to 2017
Median result
2.5pCi/L
Below action level
- Alexander
- 2.5 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
311
41st of 75 by tests
- Alexander
- 311
- Wake
- 9,694
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in NC
18 of 75
Top quarter
- Alexander
- 32.8%
- Transylvania
- 47.8%
By share, of 75 with 30+ tests
Read a result for Alexander County
Starts at Alexander County's median, 2.5 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.5 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Alexander County's median reported result, 2008 to 2017.
The data
Alexander County, At a glance
Alexander County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Alexander County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Alexander County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 36.4% |
| 2020 | 31.9% |
| 2021 | 5.9% |
| 2022 | 0.0% |
2022: 0.0%. Across these years the share ran from 0.0% to 36.4%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 2 tests were reported to CDC for Alexander 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).
Alexander County, Compared
Alexander County radon figures, compared
Calculated by Radon411In Alexander County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (102 of 311) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 2.9 points lower. Across 99 North Carolina counties pooled together, 22.6% of tests reached that level, so Alexander County runs 10.2 points above its state.
The newest figure, in 2022, counts only 2 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 311-test figure.
Of 4 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 3 a smaller one; the spread is 21.8% (Iredell County) to 44.3% (Wilkes County). By share, Alexander County is 18th of 75 North Carolina counties with 30 or more tests for the same period.
Year by year, 2014 opened at 36.4% and 2021 closed at 5.9% (down 30.5 points), with 2014 the high at 36.4%. Half the tests came in under 2.5 pCi/L and half over it; the single highest reached 288.4 pCi/L. Below the action level, 117 tests (37.6%) came in under 2 pCi/L, against 55.6% statewide, and 92 tests (29.6%) fell between 2 and 4, against 21.8% statewide.
Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 32.8% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential. CDC also counts 20 tests taken after mitigation in Alexander County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2020, with 69 tests reported; the quietest, 2022, had 2.
Alexander CountyNorth Carolina, pooled
5.9% % of tests14.9% % of tests
| Year | Tests | Alexander County, at or above 4 pCi/L | North Carolina, pooled |
|---|---|---|---|
| 2014 | 44 | 36.4% | 21.9% |
| 2020 | 69 | 31.9% | 21.1% |
| 2021 | 34 | 5.9% | 14.9% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Alexander County, Geology
The ground under Alexander County
PredictedUSGS's geologic map puts all of Alexander County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Inner Piedmont Belt, to which USGS gives a radon index of 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Inner Piedmont Belt | Proterozoic through Cambrian biotite gneiss and schist, and mica schist. | Moderate | 11 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Alexander County beside the ground around it
Across North Carolina 1.3% of the land is rated high; none of Alexander County's is. Of the 4 counties that border it, 1 has more high-potential ground, Caldwell County the most at 1.5%.
The map rates the ground, not the air in any home.
Local help
Alexander County, Local resources
Radon testing and mitigation in Alexander 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
Alexander County, Questions
Questions about radon in Alexander County
Are radon levels high in Alexander County?
In 2022, 0.0% of the radon tests reported to CDC for Alexander 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, 17 reported a higher share; pooled, the state comes to 22.6%.
Which counties border Alexander County?
Alexander County borders 4 counties: Catawba County, Iredell County, Caldwell County and Wilkes County.
Products
Alexander County, Products
Testing a home in Alexander County
In Alexander County, 32.8% of 311 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 22.6% pooled across North Carolina. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Alexander County; a long-term test tells the year-round average.
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
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Alexander County, Bordering counties
Counties bordering Alexander County
Calculated by Radon411- Radon levels in Wilkes CountyEPA zone 2
44.3%at or above 4 pCi/L
Median 3.5 pCi/L · 402 tests · 11.5 points above Alexander County
- Radon levels in Caldwell CountyEPA zone 2
27.6%at or above 4 pCi/L
Median 2.5 pCi/L · 861 tests · 5.2 points below Alexander County
- Radon levels in Catawba CountyEPA zone 2
24.8%at or above 4 pCi/L
Median 2.0 pCi/L · 1,259 tests · 8.0 points below Alexander County
- Radon levels in Iredell CountyEPA zone 2
21.8%at or above 4 pCi/L
Median 1.8 pCi/L · 1,146 tests · 11.0 points below Alexander County
Alexander County, Cities and towns
Cities and towns in Alexander County
The Census Bureau estimates 36,958 residents in Alexander County for July 1, 2025, 552 more than in 2020 (+1.5%). That works out to 142 people per square mile of land. Taylorsville, its one incorporated place, has 2,333 residents, 6.3% of the total. CDC's 311 reported tests for 2008 to 2017 work out to 8.4 per 1,000 residents (2025 estimate), close to North Carolina's 6.5.
Taylorsville is the one incorporated place here; CDC publishes no figure by town, so it reads Alexander County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Taylorsville | 2,333 | +1.5% | 6.3% |
One incorporated place, 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).
Alexander County, Homes
Homes in Alexander County
Of Alexander County's 16,126 homes, 72% are detached houses, against 65% across North Carolina; 25% are mobile homes. Half of its homes were built before 1985, close to North Carolina's 1990: 17% date from before 1960 and 23% from 2000 or later. Owners live in 82% of the occupied homes (North Carolina: 66%), so for most households a test and a fix are their own to order.
| Homes | Alexander County | North Carolina |
|---|---|---|
| Housing units | 16,126 | 4,815,195 |
| Detached houses | 72% | 65% |
| In buildings of 5 or more | 1% | 14% |
| Mobile homes | 25% | 11% |
| Built before 1960 | 17% | 14% |
| Built since 2000 | 23% | 33% |
| Middle year built | 1985 | 1990 |
| Owner-occupied | 82% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.