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 Hopkins County, Kentucky
EPA puts Hopkins County in Zone 2, its middle radon zone, and most reported tests there come back low, though 9.5% of 42 (2008 to 2017, laboratory totals) 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
9.5%
34.2 pts below KY
- Hopkins
- 9.5%
- Kentucky
- 43.7%
42 tests, 2008 to 2017
Median result
1.7pCi/L
Below action level
- Hopkins
- 1.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
42
57th of 69 by tests
- Hopkins
- 42
- 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
69 of 69
Lowest quarter
- Hopkins
- 9.5%
- Meade
- 68.4%
By share, of 69 with 30+ tests
Read a result for Hopkins County
Starts at Hopkins County's median, 1.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.7 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. Hopkins County's median reported result, 2008 to 2017.
The data
Hopkins County, At a glance
Hopkins County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Hopkins 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 Hopkins County, 2008 to 2017, laboratory
Under 2 pCi/L: 64%2 to 4 pCi/L: 26%4 pCi/L and above: 10%
Of 42 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 27 | 64.3% |
| 2 to 4 pCi/L | 11 | 26.2% |
| 4 pCi/L and above | 4 | 9.5% |
What these figures count
These are the 42 tests reported to CDC for Hopkins 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).
Hopkins County, Compared
Hopkins County radon figures, compared
Calculated by Radon411Hopkins County reports fewer high tests than Kentucky overall. 9.5% of its 42 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 34.2 points below the 43.7% pooled from 120 Kentucky counties.
Ordered from highest share down, it comes 69th of 69 Kentucky counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 35.7%; Hopkins County sits 26.2 points below it.
Christian County, the one bordering county with a figure for the same period, reported 36.1%. The reported tests do not follow EPA's Zone 2 label for Hopkins County (predicted average between 2 and 4 pCi/L): 9.5% of them reached 4 pCi/L, fewer than that label suggests.
Half the tests came in under 1.7 pCi/L and half over it; the single highest reached 19.5 pCi/L. The rest split 64.3% under 2 pCi/L and 26.2% from 2 to 4 (Kentucky: 33.2% and 23.1%).
CDC's ten-year totals for Hopkins County went from 43 tests (2005 to 2014) to 42 (2008 to 2017), the share going from 11.6% to 9.5%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Hopkins County, Geology
The ground under Hopkins County
PredictedUSGS's geologic map puts all of Hopkins County's mapped land in one class: moderate radon potential. All 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Hopkins County beside the ground around it
Across Kentucky 18.2% of the land is rated high; none of Hopkins County's is. Of the 5 counties that border it, none has as large a share of moderate-potential ground; Christian County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Hopkins County, Local resources
Radon testing and mitigation in Hopkins 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
Hopkins County, Questions
Questions about radon in Hopkins County
Are radon levels high in Hopkins County?
Over the 2008 to 2017 laboratory totals, 9.5% of the radon tests reported to CDC for Hopkins County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.7 pCi/L. Of 69 Kentucky counties with 30 or more tests for the same period, 68 reported a higher share; pooled, the state comes to 43.7%.
Which counties border Hopkins County?
Hopkins County borders 5 counties: Webster County, Caldwell County, McLean County, Muhlenberg County and Christian County.
Products
Hopkins County, Products
Testing a home in Hopkins County
In Hopkins County, 9.5% of 42 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 Hopkins 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
Hopkins County, Bordering counties
Counties bordering Hopkins County
Calculated by Radon411- Radon levels in McLean CountyEPA zone 2
50.0%at or above 4 pCi/L
Median 6.7 pCi/L · 2 tests · 40.5 points above Hopkins County
- Radon levels in Caldwell CountyEPA zone 2
40.0%at or above 4 pCi/L
Median 3.7 pCi/L · 20 tests · 30.5 points above Hopkins County
- Radon levels in Christian CountyEPA zone 2
36.1%at or above 4 pCi/L
Median 3.2 pCi/L · 72 tests · 26.6 points above Hopkins County
- Radon levels in Muhlenberg CountyEPA zone 2
17.6%at or above 4 pCi/L
Median 2.3 pCi/L · 17 tests · 8.1 points above Hopkins County
- Radon levels in Webster CountyEPA zone 2
12.5%at or above 4 pCi/L
Median 2.0 pCi/L · 8 tests · 3.0 points above Hopkins County
Hopkins County, Cities and towns
Cities and towns in Hopkins County
About 45,127 people live in Hopkins County by the Census Bureau's estimate for July 1, 2025, 242 fewer than in 2020 (−0.5%). That works out to 83 people per square mile of land. Its largest town, Madisonville, has 19,428 residents, 43.1% of the total. Reported testing is thin here: 42 tests over 2008 to 2017, or 0.9 for every 1,000 residents (2025 estimate), where Kentucky as a whole comes to 6.3.
From Madisonville to Nebo, CDC publishes no figure by town: each reads Hopkins County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Madisonville | 19,428 | −1.1% | 43.1% |
| Dawson Springsextends beyond Hopkins County | 2,231 | −9.0% | Counted whole |
| Earlington | 1,262 | +0.1% | 2.8% |
| Nortonville | 989 | +1.2% | 2.2% |
| White Plains | 874 | +3.2% | 1.9% |
| Hanson | 742 | −0.1% | 1.6% |
| Mortons Gap | 725 | +0.4% | 1.6% |
| St. Charles | 285 | +4.0% | 0.6% |
| Nebo | 211 | +1.9% | 0.5% |
9 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 Hopkins County is counted whole, so it has no share.
Hopkins County, Homes
Homes in Hopkins County
Hopkins County is a place of houses on their own lots: 76% of its 20,965 homes are detached single-family houses, against 68% across Kentucky. Half of its homes were built before 1977, close to Kentucky's 1982: 27% date from before 1960 and 17% from 2000 or later. 72% 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 | Hopkins County | Kentucky |
|---|---|---|
| Housing units | 20,965 | 2,010,655 |
| Detached houses | 76% | 68% |
| In buildings of 5 or more | 5% | 12% |
| Mobile homes | 13% | 11% |
| Built before 1960 | 27% | 22% |
| Built since 2000 | 17% | 24% |
| Middle year built | 1977 | 1982 |
| Owner-occupied | 72% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.