Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
Locations and reports
Radon Levels in White County, Tennessee
EPA puts White County in Zone 2, its middle radon zone, and only 4 radon tests from it are on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
49.0%
15.7 pts above TN
- White
- 49.0%
- Tennessee
- 33.3%
147 tests, 2008 to 2017
Median result
3.9pCi/L
Below action level
- White
- 3.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
147
34th of 80 by tests
- White
- 147
- Davidson
- 5,592
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 Tennessee
7 of 80
Top quarter
- White
- 49.0%
- Jefferson
- 56.8%
By share, of 80 with 30+ tests
Read a result for White County
Starts at White County's median, 3.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.9 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. White County's median reported result, 2008 to 2017.
The data
White County, At a glance
White County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
White County is a
USGS geologic potential: Moderate across 86% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for White County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2022 | 55.6% |
| 2023 | 25.0% |
2023: 25.0%. Across these years the share ran from 25.0% to 55.6%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 4 tests were reported to CDC for White County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
White County, Compared
White County radon figures, compared
Calculated by Radon411In White County, about 5 in 10 reported tests over the 2008 to 2017 laboratory totals (72 of 147) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 13.3 points higher. Across 95 Tennessee counties pooled together, 33.3% of tests reached that level, so White County runs 15.7 points above its state.
The newest figure, in 2023, counts only 4 tests (25.0% at or above 4 pCi/L), too few to compare, so this reading uses the 147-test figure.
Of 4 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 8.7% (Cumberland County) to 36.9% (Warren County). By share, White County is 7th of 80 Tennessee counties with 30 or more tests for the same period.
Half the tests came in under 3.9 pCi/L and half over it; the single highest reached 77.6 pCi/L. Below the action level, 39 tests (26.5%) came in under 2 pCi/L, against 42.4% statewide, and 36 tests (24.5%) fell between 2 and 4, against 24.3% statewide.
Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 49.0% share point the same way here. USGS geology rates 86% of the county's land moderate radon potential. CDC also counts 7 tests taken after mitigation in White County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2022, with 27 tests reported; the quietest, 2023, had 4.
Pooled shares: Radon411's sum of CDC's county counts for one period.
White County, Geology
The ground under White County
PredictedMost of the ground under White County is one class on USGS's geologic map: 85.9% of its land is moderate radon potential, with 14.1% low. The map puts 85.9% of White County in the area it calls Highland Rim and 14.1% in Appalachian Plateau. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Highland Rim | Paleozoic sedimentary rocks (limestone, shale, chert, and dolostone). | Moderate | 11 | 85.9% |
| Appalachian Plateau | Sandstone and shale. | Low | 8 | 14.1% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
White County beside the ground around it
Across Tennessee 47.2% of the land is rated high; none of White County's is. Of the 5 counties that border it, 2 have more high-potential ground, DeKalb County the most at 62.9%.
The map rates the ground, not the air in any home.
Local help
White County, Local resources
Radon testing and mitigation in White County
- Tennessee Radon ProgramTennessee Radon Program, run by Department of Environment & Conservation, offers free or discounted test kits, and answers questions about testing and mitigation in Tennessee.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
The Tennessee Radon Program provides free radon test kits and information assistance to residents, while also providing training opportunities to radon professionals across the state.
- Compare kits
- Professionals in Tennessee1 professional is listed in Tennessee.
What Tennessee's program says
- Phone
- 1-800-232-1139
- TDEC.Radon@tn.gov
What it means
White County, Questions
Questions about radon in White County
Are radon levels high in White County?
In 2023, 25.0% of the radon tests reported to CDC for White County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.6 pCi/L. Of 80 Tennessee counties with 30 or more tests for the same period, 6 reported a higher share; pooled, the state comes to 33.3%.
Which counties border White County?
White County borders 5 counties: Putnam County, Van Buren County, DeKalb County, Warren County and Cumberland County.
Products
White County, Products
Testing a home in White County
In White County, 49.0% of 147 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 33.3% pooled across Tennessee. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in White County; a long-term test tells the year-round average.
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
MonitorKidde
Radon Detector (RAB) battery digital radon detector with an alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
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White County, Bordering counties
Counties bordering White County
Calculated by Radon411- Radon levels in Van Buren CountyEPA zone 2
40.9%at or above 4 pCi/L
Median 2.1 pCi/L · 22 tests · 8.1 points below White County
- Radon levels in Warren CountyEPA zone 2
36.9%at or above 4 pCi/L
Median 3.0 pCi/L · 149 tests · 12.1 points below White County
- Radon levels in Putnam CountyEPA zone 2
36.0%at or above 4 pCi/L
Median 2.6 pCi/L · 336 tests · 13.0 points below White County
- Radon levels in DeKalb CountyEPA zone 2
30.5%at or above 4 pCi/L
Median 3.1 pCi/L · 59 tests · 18.5 points below White County
- Radon levels in Cumberland CountyEPA zone 3
8.7%at or above 4 pCi/L
Median 1.3 pCi/L · 172 tests · 40.3 points below White County
White County, Cities and towns
Cities and towns in White County
White County is growing: the Census Bureau puts it at 29,612 residents on July 1, 2025, up 7.9% from 27,441 in 2020. That works out to 79 people per square mile of land. No town dominates: Sparta, the largest, has 5,038 residents, 17.0% of the total. Together its 2 incorporated places hold 18.8% of those residents; the other 81.2% live outside any of them. CDC's 147 reported tests for 2008 to 2017 work out to 5.0 per 1,000 residents (2025 estimate), close to Tennessee's 4.2.
From Sparta to Doyle, CDC publishes no figure by town: each reads White County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Sparta | 5,038 | +0.3% | 17.0% |
| Doyle | 540 | +8.9% | 1.8% |
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).
White County, Homes
Homes in White County
White County is a place of houses on their own lots: 76% of its 12,158 homes are detached single-family houses, against 68% across Tennessee. Half of its homes were built before 1985, close to Tennessee's 1986: 17% date from before 1960 and 23% from 2000 or later. Owners live in 78% of the occupied homes (Tennessee: 67%), so for most households a test and a fix are their own to order.
| Homes | White County | Tennessee |
|---|---|---|
| Housing units | 12,158 | 3,095,472 |
| Detached houses | 76% | 68% |
| In buildings of 5 or more | 2% | 14% |
| Mobile homes | 18% | 8% |
| Built before 1960 | 17% | 18% |
| Built since 2000 | 23% | 29% |
| Middle year built | 1985 | 1986 |
| Owner-occupied | 78% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.