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 Fentress County, Tennessee
EPA puts Fentress County in Zone 2, its middle radon zone, and only 1 radon test from it is 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
9.1%
24.2 pts below TN
- Fentress
- 9.1%
- Tennessee
- 33.3%
33 tests, 2008 to 2017
Median result
1.3pCi/L
Below action level
- Fentress
- 1.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
33
77th of 80 by tests
- Fentress
- 33
- 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
70 of 80
Lowest quarter
- Fentress
- 9.1%
- Jefferson
- 56.8%
By share, of 80 with 30+ tests
Read a result for Fentress County
Starts at Fentress County's median, 1.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.3 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. Fentress County's median reported result, 2008 to 2017.
The data
Fentress County, At a glance
Fentress County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Fentress County is a
USGS geologic potential: Low across 70% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Fentress County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2022 | 16.7% |
| 2023 | 0.0% |
2023: 0.0%. Across these years the share ran from 0.0% to 16.7%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 1 test was reported to CDC for Fentress 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).
Fentress County, Compared
Fentress County radon figures, compared
Calculated by Radon411Fentress County reports fewer high tests than Tennessee overall. 9.1% of its 33 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 24.2 points below the 33.3% pooled from 95 Tennessee counties.
The newest figure, in 2023, counts only 1 test (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 33-test figure.
Ordered from highest share down, it comes 70th of 80 Tennessee counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 35.7%; Fentress County sits 26.6 points below it.
Next door, the shares run from 2.6% in Scott County to 46.5% in Pickett County, with Cumberland County, Morgan County and Scott County below Fentress County. The reported tests do not follow EPA's Zone 2 label for Fentress County (predicted average between 2 and 4 pCi/L): 9.1% of them reached 4 pCi/L, fewer than that label suggests.
Half the tests came in under 1.3 pCi/L and half over it; the single highest reached 58.0 pCi/L. The rest split 75.8% under 2 pCi/L and 15.2% from 2 to 4 (Tennessee: 42.4% and 24.3%).
The busiest year on file was 2022, with 18 tests reported; the quietest, 2023, had 1.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Fentress County, Geology
The ground under Fentress County
PredictedUSGS's geologic map splits Fentress County: 70.0% of its land is low radon potential and 30.0% moderate. The map puts 70.0% of Fentress County in the area it calls Appalachian Plateau and 30.0% in Highland Rim. USGS gives the first a radon index of 8, in the low band (5 to 8), and the second 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Appalachian Plateau | Sandstone and shale. | Low | 8 | 70.0% |
| Highland Rim | Paleozoic sedimentary rocks (limestone, shale, chert, and dolostone). | Moderate | 11 | 30.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Fentress County beside the ground around it
Across Tennessee 47.2% of the land is rated high; none of Fentress County's is. Of the 6 counties that border it, 3 have more high-potential ground, Putnam County the most at 9.4%.
The map rates the ground, not the air in any home.
Local help
Fentress County, Local resources
Radon testing and mitigation in Fentress 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
Fentress County, Questions
Questions about radon in Fentress County
Are radon levels high in Fentress County?
In 2023, 0.0% of the radon tests reported to CDC for Fentress County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.3 pCi/L. Of 80 Tennessee counties with 30 or more tests for the same period, 69 reported a higher share; pooled, the state comes to 33.3%.
Which counties border Fentress County?
Fentress County borders 6 counties: Pickett County, Morgan County, Overton County, Scott County, Cumberland County and Putnam County.
Products
Fentress County, Products
Testing a home in Fentress County
In Fentress County, 9.1% of 33 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 Fentress 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
Fentress County, Bordering counties
Counties bordering Fentress County
Calculated by Radon411- Radon levels in Pickett CountyEPA zone 2
46.5%at or above 4 pCi/L
Median 3.5 pCi/L · 43 tests · 37.4 points above Fentress County
- Radon levels in Overton CountyEPA zone 2
40.6%at or above 4 pCi/L
Median 2.8 pCi/L · 128 tests · 31.5 points above Fentress County
- Radon levels in Putnam CountyEPA zone 2
36.0%at or above 4 pCi/L
Median 2.6 pCi/L · 336 tests · 26.9 points above Fentress County
- Radon levels in Cumberland CountyEPA zone 3
8.7%at or above 4 pCi/L
Median 1.3 pCi/L · 172 tests · 0.4 points below Fentress County
- Radon levels in Morgan CountyEPA zone 3
6.5%at or above 4 pCi/L
Median 1.7 pCi/L · 31 tests · 2.6 points below Fentress County
- Radon levels in Scott CountyEPA zone 3
2.6%at or above 4 pCi/L
Median 1.3 pCi/L · 39 tests · 6.5 points below Fentress County
Fentress County, Cities and towns
Cities and towns in Fentress County
Fentress County is growing: the Census Bureau puts it at 20,322 residents on July 1, 2025, up 9.7% from 18,533 in 2020. That works out to 41 people per square mile of land. No town dominates: Jamestown, the largest, has 2,135 residents, 10.5% of the total. Together its 2 incorporated places hold 13.5% of those residents; the other 86.5% live outside any of them. Reported testing is thin here: 33 tests over 2008 to 2017, or 1.6 for every 1,000 residents (2025 estimate), where Tennessee as a whole comes to 4.2.
From Jamestown to Allardt, CDC publishes no figure by town: each reads Fentress County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Jamestown | 2,135 | +5.6% | 10.5% |
| Allardt | 606 | +9.0% | 3.0% |
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).
Fentress County, Homes
Homes in Fentress County
Of Fentress County's 9,228 homes, 74% are detached houses, against 68% across Tennessee; 20% are mobile homes. Half of its homes were built before 1988, close to Tennessee's 1986: 11% date from before 1960 and 26% from 2000 or later. Owners live in 81% of the occupied homes (Tennessee: 67%), so for most households a test and a fix are their own to order.
| Homes | Fentress County | Tennessee |
|---|---|---|
| Housing units | 9,228 | 3,095,472 |
| Detached houses | 74% | 68% |
| In buildings of 5 or more | 2% | 14% |
| Mobile homes | 20% | 8% |
| Built before 1960 | 11% | 18% |
| Built since 2000 | 26% | 29% |
| Middle year built | 1988 | 1986 |
| Owner-occupied | 81% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.