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
Locations and reports
Radon Levels in Transylvania County, North Carolina
EPA puts Transylvania County in Zone 1, its highest radon zone, and only 20 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
49.1%
25.0 pts above NC
- Transylvania
- 49.1%
- NC
- 24.1%
4,006 tests, 2006 to 2015
Median result
3.8pCi/L
Below action level
- Transylvania
- 3.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2006 to 2015
Tests reported
4,006
6th of 70 by tests
- Transylvania
- 4,006
- Wake
- 9,290
Reported to CDC before any fix, 2006 to 2015
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in NC
1 of 70
Top quarter
- Transylvania
- 49.1%
- Transylvania
- 49.1%
By share, of 70 with 30+ tests
Read a result for Transylvania County
Starts at Transylvania County's median, 3.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.8 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. Transylvania County's median reported result, 2006 to 2015.
The data
Transylvania County, At a glance
Transylvania County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Transylvania County in
USGS geologic potential: High across 52% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Transylvania County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 38.2% |
| 2020 | 26.6% |
| 2021 | 28.5% |
| 2022 | 5.0% |
2022: 5.0%. Across these years the share ran from 5.0% to 38.2%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 20 tests were reported to CDC for Transylvania 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).
Transylvania County, Compared
Transylvania County radon figures, compared
Calculated by Radon411In Transylvania County, about 5 in 10 reported tests over the 2006 to 2015 laboratory totals (1,966 of 4,006) were at or above EPA's action level. Against the national pool of 36.3%, the gap is 12.8 points higher. Across 97 North Carolina counties pooled together, 24.1% of tests reached that level, so Transylvania County runs 25.0 points above its state.
The newest figure, in 2022, counts only 20 tests (5.0% at or above 4 pCi/L), too few to compare, so this reading uses the 4,006-test figure.
Of 7 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 20.8% (Greenville County, SC) to 44.7% (Oconee County, SC). By share, Transylvania County is 1st of 70 North Carolina counties with 30 or more tests for the same period.
Year by year, 2014 opened at 38.2% and 2021 closed at 28.5% (down 9.7 points), with 2014 the high at 38.2%. Half the tests came in under 3.8 pCi/L and half over it; the single highest reached 305.7 pCi/L. Below the action level, 1,036 tests (25.9%) came in under 2 pCi/L, against 54.3% statewide, and 1,004 tests (25.1%) fell between 2 and 4, against 21.7% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 49.1% share point the same way here. USGS geology rates 52% of the county's land high radon potential. CDC also counts 380 tests taken after mitigation in Transylvania County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2014, with 649 tests reported; the quietest, 2022, had 20.
Transylvania CountyNorth Carolina, pooled
28.5% % of tests14.9% % of tests
| Year | Tests | Transylvania County, at or above 4 pCi/L | North Carolina, pooled |
|---|---|---|---|
| 2014 | 649 | 38.2% | 21.9% |
| 2020 | 526 | 26.6% | 21.1% |
| 2021 | 355 | 28.5% | 14.9% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Transylvania County, Geology
The ground under Transylvania County
PredictedUSGS's geologic map splits Transylvania County: 52.0% of its land is high radon potential and 48.0% moderate. The map puts 34.3% of Transylvania County in the area it calls Chauga Belt and 30.6% in Georgiabama Thrust Stack (South), with 3 smaller areas beside them. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Chauga Belt | Monzonitic to granodioritic gneiss. | High | 12 | 34.3% |
| Georgiabama Thrust Stack (South) | Schist, amphibolite and granite. | Moderate | 9 | 30.6% |
| Brevard Fault Zone | Schist, marble and phyllonite. | High | 12 | 17.7% |
| Blue Ridge | Granite, pegmatite, monazite, schist, and gneiss. | Moderate | 10 | 13.8% |
| Inner Piedmont Belt | Proterozoic through Cambrian biotite gneiss and schist, and mica schist. | Moderate | 11 | 3.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Transylvania County beside the ground around it
Transylvania County has more high-potential ground than North Carolina as a whole: 52.0% of its land against 1.3%. Of the 7 counties that border it, 1 has more high-potential ground, Henderson County the most at 52.6%.
The map rates the ground, not the air in any home.
Local help
Transylvania County, Local resources
Radon testing and mitigation in Transylvania 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
Transylvania County, Questions
Questions about radon in Transylvania County
Are radon levels high in Transylvania County?
In 2022, 5.0% of the radon tests reported to CDC for Transylvania County, North Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.0 pCi/L. Of 70 North Carolina counties with 30 or more tests for the same period, none reported a higher share; pooled, the state comes to 24.1%.
Which counties border Transylvania County?
Transylvania County borders 7 counties: Henderson County, NC, Jackson County, NC, Pickens County, SC, Haywood County, NC, Buncombe County, NC, Oconee County, SC and Greenville County, SC.
Products
Transylvania County, Products
Testing a home in Transylvania County
In Transylvania County, 49.1% of 4,006 tests reported to CDC over the 2006 to 2015 laboratory totals reached 4 pCi/L, against 24.1% pooled across North Carolina. In Zone 1 the year-round level in Transylvania County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
MonitorX-Sense
XR0A-SR battery digital radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Transylvania County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Transylvania County
Explore
Transylvania County, Bordering counties
Counties bordering Transylvania County
Calculated by Radon411- Radon levels in Oconee County, SCEPA zone 2
44.7%at or above 4 pCi/L
Median 3.4 pCi/L · 2,176 tests · 4.4 points below Transylvania County
- Radon levels in Henderson County, NCEPA zone 1
43.0%at or above 4 pCi/L
Median 3.3 pCi/L · 4,025 tests · 6.1 points below Transylvania County
- Radon levels in Buncombe County, NCEPA zone 1
30.9%at or above 4 pCi/L
Median 2.4 pCi/L · 6,952 tests · 18.2 points below Transylvania County
- Radon levels in Haywood County, NCEPA zone 2
30.1%at or above 4 pCi/L
Median 2.2 pCi/L · 1,891 tests · 19.0 points below Transylvania County
- Radon levels in Jackson County, NCEPA zone 2
26.7%at or above 4 pCi/L
Median 2.1 pCi/L · 974 tests · 22.4 points below Transylvania County
- Radon levels in Pickens County, SCEPA zone 2
23.4%at or above 4 pCi/L
Median 1.8 pCi/L · 1,478 tests · 25.7 points below Transylvania County
- Radon levels in Greenville County, SCEPA zone 1
20.8%at or above 4 pCi/L
Median 1.8 pCi/L · 10,539 tests · 28.3 points below Transylvania County
Transylvania County, Cities and towns
Cities and towns in Transylvania County
The Census Bureau estimates 34,211 residents in Transylvania County for July 1, 2025, 956 more than in 2020 (+2.9%). That works out to 90 people per square mile of land. Its largest town, Brevard, has 8,098 residents, 23.7% of the total. Together its 2 incorporated places hold 25.9% of those residents; the other 74.1% live outside any of them. Testing is reported here more often than across the state: CDC's 4,006 reported tests for 2006 to 2015 come to 117 for every 1,000 residents (2025 estimate), against 5.8 for North Carolina.
From Brevard to Rosman, CDC publishes no figure by town: each reads Transylvania County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Brevard | 8,098 | +3.6% | 23.7% |
| Rosman | 760 | +6.6% | 2.2% |
2 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).
Transylvania County, Homes
Homes in Transylvania County
Transylvania County is a place of houses on their own lots: 75% of its 19,147 homes are detached single-family houses, against 65% across North Carolina. Half of its homes were built before 1983, close to North Carolina's 1990: 17% date from before 1960 and 22% from 2000 or later. Owners live in 75% of the occupied homes (North Carolina: 66%), so for most households a test and a fix are their own to order.
| Homes | Transylvania County | North Carolina |
|---|---|---|
| Housing units | 19,147 | 4,815,195 |
| Detached houses | 75% | 65% |
| In buildings of 5 or more | 5% | 14% |
| Mobile homes | 14% | 11% |
| Built before 1960 | 17% | 14% |
| Built since 2000 | 22% | 33% |
| Middle year built | 1983 | 1990 |
| Owner-occupied | 75% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.