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 Henderson County, Tennessee
EPA puts Henderson County in Zone 2, its middle radon zone, and 16.7% of its 30 reported radon tests (2008 to 2017, laboratory totals) were at or above 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
16.7%
16.6 pts below TN
- Henderson
- 16.7%
- Tennessee
- 33.3%
30 tests, 2008 to 2017
Median result
1.6pCi/L
Below action level
- Henderson
- 1.6 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
30
80th of 80 by tests
- Henderson
- 30
- 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
62 of 80
Lowest quarter
- Henderson
- 16.7%
- Jefferson
- 56.8%
By share, of 80 with 30+ tests
Read a result for Henderson County
Starts at Henderson County's median, 1.6 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.6 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. Henderson County's median reported result, 2008 to 2017.
The data
Henderson County, At a glance
Henderson County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Henderson County is a
USGS geologic potential: Moderate across 79% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Henderson County, 2008 to 2017, laboratory
Under 2 pCi/L: 60%2 to 4 pCi/L: 23%4 pCi/L and above: 17%
Of 30 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 18 | 60.0% |
| 2 to 4 pCi/L | 7 | 23.3% |
| 4 pCi/L and above | 5 | 16.7% |
What these figures count
These are the 30 tests reported to CDC for Henderson County over 2008 to 2017 (laboratory totals), 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: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Henderson County, Compared
Henderson County radon figures, compared
Calculated by Radon411Henderson County's 30 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.6 pCi/L and a maximum of 30.0 pCi/L, and 16.7% reached 4 pCi/L. Tennessee as a whole (95 Tennessee counties, pooled) comes to 33.3%: 16.6 points higher than here.
Among its state's counties it ranks 62nd of 80 Tennessee counties with 30 or more tests for the same period. Statewide for the same period, Jefferson County reported the highest share (56.8%) and Chester County the lowest (0.0%).
Below the action level, 18 tests (60.0%) came in under 2 pCi/L, against 42.4% statewide, and 7 tests (23.3%) fell between 2 and 4, against 24.3% statewide. CDC's ten-year totals for Henderson County went from 31 tests (2005 to 2014) to 30 (2008 to 2017), the share going from 9.7% to 16.7%.
EPA's 1993 zone map puts Henderson County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 79% of the county's land moderate radon potential.
Next door, the shares run from 0.0% in Chester County to 8.7% in Madison County, with Madison County, Hardin County and Chester County below Henderson County.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Henderson County, Geology
The ground under Henderson County
PredictedMost of the ground under Henderson County is one class on USGS's geologic map: 78.6% of its land is moderate radon potential, with 21.4% low. The map puts 78.6% of Henderson County in the area it calls East Coastal Plain and 21.4% in Loess-Covered Coastal Plain. USGS gives the first a radon index of 9, 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 |
|---|---|---|---|---|
| East Coastal Plain | Cretaceous and younger marine and fluvial sand, clay, and marl. | Moderate | 9 | 78.6% |
| Loess-Covered Coastal Plain | Cretaceous and younger marine and fluvial sand, clay, and marl covered with loess. | Low | 8 | 21.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Henderson County beside the ground around it
Across Tennessee 47.2% of the land is rated high; none of Henderson County's is. Of the 5 counties that border it, 2 have more high-potential ground, Decatur County the most at 67.3%.
The map rates the ground, not the air in any home.
Local help
Henderson County, Local resources
Radon testing and mitigation in Henderson 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
Henderson County, Questions
Questions about radon in Henderson County
Are radon levels high in Henderson County?
Over the 2008 to 2017 laboratory totals, 16.7% of the radon tests reported to CDC for Henderson 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, 61 reported a higher share; pooled, the state comes to 33.3%.
Which counties border Henderson County?
Henderson County borders 5 counties: Decatur County, Carroll County, Chester County, Madison County and Hardin County.
Products
Henderson County, Products
Testing a home in Henderson County
In Henderson County, 16.7% of 30 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 Henderson 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
MonitorINKBIRD
INK-RD3 battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Henderson County, Bordering counties
Counties bordering Henderson County
Calculated by Radon411- Radon levels in Decatur CountyEPA zone 2
29.4%at or above 4 pCi/L
Median 1.7 pCi/L · 17 tests · 12.7 points above Henderson County
- Radon levels in Carroll CountyEPA zone 3
20.0%at or above 4 pCi/L
Median 1.0 pCi/L · 25 tests · 3.3 points above Henderson County
- Radon levels in Madison CountyEPA zone 1
8.7%at or above 4 pCi/L
Median 1.2 pCi/L · 92 tests · 8.0 points below Henderson County
- Radon levels in Hardin CountyEPA zone 2
7.9%at or above 4 pCi/L
Median 1.0 pCi/L · 38 tests · 8.8 points below Henderson County
- Radon levels in Chester CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 1.1 pCi/L · 44 tests · 16.7 points below Henderson County
Henderson County, Cities and towns
Cities and towns in Henderson County
The Census Bureau estimates 28,518 residents in Henderson County for July 1, 2025, 685 more than in 2020 (+2.5%). That works out to 55 people per square mile of land. Its largest town, Lexington, has 8,130 residents, 28.5% of the total. Reported testing is thin here: 30 tests over 2008 to 2017, or 1.1 for every 1,000 residents (2025 estimate), where Tennessee as a whole comes to 4.2.
From Lexington to Parker's Crossroads, CDC publishes no figure by town: each reads Henderson County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Lexington | 8,130 | +2.5% | 28.5% |
| Scotts Hillextends beyond Henderson County | 893 | +3.5% | Counted whole |
| Sardis | 417 | +2.7% | 1.5% |
| Parker's Crossroads | 287 | +1.1% | 1.0% |
4 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). A place that extends beyond Henderson County is counted whole, so it has no share.
Henderson County, Homes
Homes in Henderson County
Of Henderson County's 12,944 homes, 71% are detached houses, against 68% across Tennessee; 22% are mobile homes. Half of its homes were built before 1987, close to Tennessee's 1986: 15% date from before 1960 and 24% from 2000 or later. 72% of occupied homes are lived in by their owner (Tennessee: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Henderson County | Tennessee |
|---|---|---|
| Housing units | 12,944 | 3,095,472 |
| Detached houses | 71% | 68% |
| In buildings of 5 or more | 2% | 14% |
| Mobile homes | 22% | 8% |
| Built before 1960 | 15% | 18% |
| Built since 2000 | 24% | 29% |
| Middle year built | 1987 | 1986 |
| Owner-occupied | 72% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.