Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Henderson County, Kentucky
EPA puts Henderson County in Zone 2, its middle radon zone, and 24.1% of its 54 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
24.1%
19.6 pts below KY
- Henderson
- 24.1%
- Kentucky
- 43.7%
54 tests, 2008 to 2017
Median result
2.3pCi/L
Below action level
- Henderson
- 2.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
54
51st of 69 by tests
- Henderson
- 54
- Jefferson
- 6,590
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 Kentucky
56 of 69
Lowest quarter
- Henderson
- 24.1%
- Meade
- 68.4%
By share, of 69 with 30+ tests
Read a result for Henderson County
Starts at Henderson County's median, 2.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.3 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. 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 100% 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: 41%2 to 4 pCi/L: 35%4 pCi/L and above: 24%
Of 54 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 22 | 40.7% |
| 2 to 4 pCi/L | 19 | 35.2% |
| 4 pCi/L and above | 13 | 24.1% |
What these figures count
These are the 54 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 54 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.3 pCi/L and a maximum of 22.6 pCi/L, and 24.1% reached 4 pCi/L. Kentucky as a whole (120 Kentucky counties, pooled) comes to 43.7%: 19.6 points higher than here.
Among its state's counties it ranks 56th of 69 Kentucky counties with 30 or more tests for the same period. Statewide for the same period, Meade County reported the highest share (68.4%) and Hopkins County the lowest (9.5%).
Below the action level, 22 tests (40.7%) came in under 2 pCi/L, against 33.2% statewide, and 19 tests (35.2%) fell between 2 and 4, against 23.1% statewide. CDC's ten-year totals for Henderson County went from 34 tests (2005 to 2014) to 54 (2008 to 2017), the share going from 38.2% to 24.1%.
EPA's 1993 zone map puts Henderson County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Next door, the shares run from 20.0% in Daviess County to 35.3% in Posey County, IN, with Warrick County, IN and Daviess County below Henderson County.
CDC also counts 5 tests taken after mitigation in Henderson County for the same period: tests in homes where a fix was already in.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Henderson County, Geology
The ground under Henderson County
PredictedUSGS's geologic map puts all of Henderson County's mapped land in one class: moderate radon potential. 99.5% of it lies in the area the map calls Western Coalfield, to which USGS gives a radon index of 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Western Coalfield | Limestones, shale, siltstone, and coal beds. | Moderate | 9 | 99.5% |
| Wabash Lowland | Loess, pre-Wisconsinan glacial deposits, Pennsylvanian shale, sandstone, and carbonate bedrock. | Moderate | 10 | 0.5% |
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 Kentucky 18.2% of the land is rated high; none of Henderson County's is. Of the 7 counties that border it, none has as large a share of moderate-potential ground; McLean County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Henderson County, Local resources
Radon testing and mitigation in Henderson County
- Kentucky's radon programKentucky Board of Radon SafetyKentucky's radon program answers questions about testing, mitigation and the rules in Kentucky.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 Kentucky8 professionals are listed in Kentucky.
What Kentucky's program says
- Phone
- 502-782-2782
- Radon@ky.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, 24.1% of the radon tests reported to CDC for Henderson County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.3 pCi/L. Of 69 Kentucky counties with 30 or more tests for the same period, 55 reported a higher share; pooled, the state comes to 43.7%.
Which counties border Henderson County?
Henderson County borders 7 counties: Vanderburgh County, IN, Webster County, KY, Posey County, IN, Union County, KY, Warrick County, IN, McLean County, KY and Daviess County, KY.
Products
Henderson County, Products
Testing a home in Henderson County
In Henderson County, 24.1% of 54 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 43.7% pooled across Kentucky. 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
Monitor
RadonScan USB-powered radon monitor with a color screen
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 5 minutes
- 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 McLean County, KYEPA zone 2
50.0%at or above 4 pCi/L
Median 6.7 pCi/L · 2 tests · 25.9 points above Henderson County
- Radon levels in Posey County, INEPA zone 2
35.3%at or above 4 pCi/L
Median 2.8 pCi/L · 215 tests · 11.2 points above Henderson County
- Radon levels in Union County, KYEPA zone 2
25.0%at or above 4 pCi/L
Median 1.6 pCi/L · 8 tests · 0.9 points above Henderson County
- Radon levels in Vanderburgh County, INEPA zone 2
24.4%at or above 4 pCi/L
Median 2.4 pCi/L · 1,505 tests · 0.3 points above Henderson County
- Radon levels in Warrick County, INEPA zone 2
20.9%at or above 4 pCi/L
Median 1.8 pCi/L · 561 tests · 3.2 points below Henderson County
- Radon levels in Daviess County, KYEPA zone 2
20.0%at or above 4 pCi/L
Median 1.8 pCi/L · 145 tests · 4.1 points below Henderson County
- Radon levels in Webster County, KYEPA zone 2
12.5%at or above 4 pCi/L
Median 2.0 pCi/L · 8 tests · 11.6 points below Henderson County
Henderson County, Cities and towns
Cities and towns in Henderson County
About 44,255 people live in Henderson County by the Census Bureau's estimate for July 1, 2025, 422 fewer than in 2020 (−0.9%). That works out to 101 people per square mile of land. Henderson alone is home to 27,822 of them, 62.9% of the total. Together its 3 incorporated places hold 65.5% of those residents; the other 34.5% live outside any of them. Reported testing is thin here: 54 tests over 2008 to 2017, or 1.2 for every 1,000 residents (2025 estimate), where Kentucky as a whole comes to 6.3.
From Henderson to Robards, CDC publishes no figure by town: each reads Henderson County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Henderson | 27,822 | −1.1% | 62.9% |
| Corydon | 725 | −0.5% | 1.6% |
| Robards | 443 | −1.1% | 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).
Henderson County, Homes
Homes in Henderson County
Of Henderson County's 20,109 homes, 67% are detached houses, against 68% across Kentucky; 12% are in buildings of five or more homes. Half of its homes were built before 1976, close to Kentucky's 1982: 30% date from before 1960 and 17% from 2000 or later. 64% of occupied homes are lived in by their owner (Kentucky: 68%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Henderson County | Kentucky |
|---|---|---|
| Housing units | 20,109 | 2,010,655 |
| Detached houses | 67% | 68% |
| In buildings of 5 or more | 12% | 12% |
| Mobile homes | 10% | 11% |
| Built before 1960 | 30% | 22% |
| Built since 2000 | 17% | 24% |
| Middle year built | 1976 | 1982 |
| Owner-occupied | 64% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.