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 Wilson County, Tennessee
EPA puts Wilson County in Zone 1, its highest radon zone, and most reported tests there come back low, though 2.4% of 82 (2023) reached 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
2.4%
22.5 pts below TN
- Wilson
- 2.4%
- Tennessee
- 24.9%
82 tests, 2023
Median result
0.9pCi/L
Below action level
- Wilson
- 0.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
82
9th of 15 by tests
- Wilson
- 82
- Hamblen
- 594
Reported to CDC before any fix, 2023
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Tennessee
14 of 15
Lowest quarter
- Wilson
- 2.4%
- Blount
- 50.0%
By share, of 15 with 30+ tests
Read a result for Wilson County
Starts at Wilson County's median, 0.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.9 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. Wilson County's median reported result, 2023.
The data
Wilson County, At a glance
Wilson County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Wilson County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Wilson County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2022 | 17.2% |
| 2023 | 2.4% |
2023: 2.4%. Across these years the share ran from 2.4% to 17.2%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 82 tests reported to CDC for Wilson County over 2023, many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.
Measured: CDC tracking data. Figure above: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Wilson County, Compared
Wilson County radon figures, compared
Calculated by Radon411Only 2 of 82 radon tests reported for Wilson County in 2023 reached 4 pCi/L (2.4%). The median result, 0.9 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 20.8 pCi/L.
Across 70 Tennessee counties pooled together, 24.9% of tests reached that level, so Wilson County runs 22.5 points below its state. Against the national pool of 33.4%, the gap is 31.0 points lower. Its place in the state: 14th of 15 Tennessee counties with 30 or more tests for the same period.
The reported tests do not follow EPA's Zone 1 label for Wilson County (predicted average above 4 pCi/L): 2.4% of them reached 4 pCi/L, fewer than that label suggests. Of 3 neighbours with a figure, all 3 reported a larger share at or above 4 pCi/L; the spread is 20.0% (Rutherford County) to 27.4% (Davidson County).
Below the action level, 77 tests (93.9%) came in under 2 pCi/L, against 49.4% statewide, and 3 tests (3.7%) fell between 2 and 4, against 25.7% statewide. USGS geology rates 100% of the county's land high radon potential.
The busiest year on file was 2022, with 87 tests reported; the quietest, 2023, had 82.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Wilson County, Geology
The ground under Wilson County
PredictedUSGS's geologic map puts all of Wilson County's mapped land in one class: high radon potential. All of it lies in the area the map calls Nashville Basin, to which USGS gives a radon index of 14, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Nashville Basin | Mississippian Limestone. | High | 14 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Wilson County beside the ground around it
Wilson County has more high-potential ground than Tennessee as a whole: 100% of its land against 47.2%. Of the 7 counties that border it, none has as large a share of high-potential ground; Rutherford County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Wilson County, Local resources
Radon testing and mitigation in Wilson 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
Wilson County, Questions
Questions about radon in Wilson County
Are radon levels high in Wilson County?
In 2023, 2.4% of the radon tests reported to CDC for Wilson County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.9 pCi/L. Of 15 Tennessee counties with 30 or more tests for the same period, 13 reported a higher share; pooled, the state comes to 24.9%.
Which counties border Wilson County?
Wilson County borders 7 counties: Trousdale County, Rutherford County, Smith County, Sumner County, Davidson County, Cannon County and DeKalb County.
Products
Wilson County, Products
Testing a home in Wilson County
In Wilson County, 2.4% of 82 tests reported to CDC in 2023 reached 4 pCi/L, against 24.9% pooled across Tennessee. In Zone 1 the year-round level in Wilson 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
Monitor
EcoQube Wi-Fi continuous radon monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi
- App only
Method: Ion chamber
First reading: Within 10 minutes
Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Wilson County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Wilson County
Explore
Wilson County, Bordering counties
Counties bordering Wilson County
Calculated by Radon411- Radon levels in Davidson CountyEPA zone 1
27.4%at or above 4 pCi/L
Median 2.2 pCi/L · 146 tests · 25.0 points above Wilson County
- Radon levels in Rutherford CountyEPA zone 1
20.0%at or above 4 pCi/L
Median 1.6 pCi/L · 50 tests · 17.6 points above Wilson County
- Radon levels in Sumner CountyEPA zone 2
20.0%at or above 4 pCi/L
Median 1.4 pCi/L · 30 tests · 17.6 points above Wilson County
- Radon levels in Trousdale CountyEPA zone 1
0.0%at or above 4 pCi/L
Median 3.6 pCi/L · 1 test · 2.4 points below Wilson County
- Radon levels in Smith CountyEPA zone 1
0.0%at or above 4 pCi/L
Median 2.9 pCi/L · 1 test · 2.4 points below Wilson County
- Radon levels in Cannon CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 1.3 pCi/L · 1 test · 2.4 points below Wilson County
- Radon levels in DeKalb CountyEPA zone 2
No CDC figure for 2023; its page reads it against its own neighbours.
Wilson County, Cities and towns
Cities and towns in Wilson County
Wilson County is growing: the Census Bureau puts it at 175,033 residents on July 1, 2025, up 17.7% from 148,654 in 2020. That works out to 307 people per square mile of land. Its largest town, Lebanon, has 53,412 residents, 30.5% of the total. Together its 3 incorporated places hold 57.3% of those residents; the other 42.7% live outside any of them. CDC's 82 reported tests for 2023 work out to 0.5 per 1,000 residents (2025 estimate), close to Tennessee's 0.3.
From Lebanon to Watertown, CDC publishes no figure by town: each reads Wilson County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Lebanon | 53,412 | +37.3% | 30.5% |
| Mount Juliet | 45,172 | +13.8% | 25.8% |
| Watertown | 1,691 | +8.7% | 1.0% |
3 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).
Wilson County, Homes
Homes in Wilson County
Wilson County is a place of houses on their own lots: 76% of its 60,976 homes are detached single-family houses, against 68% across Tennessee. Much of Wilson County is recent building: 47% of its homes have gone up since 2000 and the middle year built is 1998, against 1986 for Tennessee. Owners live in 77% of the occupied homes (Tennessee: 67%), so for most households a test and a fix are their own to order.
| Homes | Wilson County | Tennessee |
|---|---|---|
| Housing units | 60,976 | 3,095,472 |
| Detached houses | 76% | 68% |
| In buildings of 5 or more | 10% | 14% |
| Mobile homes | 6% | 8% |
| Built before 1960 | 7% | 18% |
| Built since 2000 | 47% | 29% |
| Middle year built | 1998 | 1986 |
| Owner-occupied | 77% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.