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Radon Levels in Christian County, Kentucky

EPA puts Christian County in Zone 2, its middle radon zone, and 36.1% of its 72 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    36.1%

    7.6 pts below KY

    Christian
    36.1%
    Kentucky
    43.7%

    72 tests, 2008 to 2017

  • Median result

    3.2pCi/L

    Below action level

    Christian
    3.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    72

    45th of 69 by tests

    Christian
    72
    Jefferson
    6,590

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in Kentucky

    36 of 69

    Middle half

    Christian
    36.1%
    Meade
    68.4%

    By share, of 69 with 30+ tests

Read a result for Christian County

Starts at Christian County's median, 3.2 pCi/L

3.2pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 3.2 pCi/L

Between 2 and 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 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. Christian County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Christian County, At a glance

Christian County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Christian County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

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 Christian County, 2008 to 2017, laboratory

Reported results by concentration band, Christian County, 2008 to 2017, laboratory
Under 2 pCi/L: 33%2 to 4 pCi/L: 31%4 pCi/L and above: 36%

Of 72 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Christian County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L2433.3%
2 to 4 pCi/L2230.6%
4 pCi/L and above2636.1%
What these figures count

These are the 72 tests reported to CDC for Christian 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).

How to read these figures

Christian County, Compared

Christian County radon figures, compared

Calculated by Radon411

In Christian County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (26 of 72) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 0.4 points higher. Across 120 Kentucky counties pooled together, 43.7% of tests reached that level, so Christian County runs 7.6 points below its state.

Of 5 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 9.5% (Hopkins County) to 33.8% (Montgomery County, TN). By share, Christian County is 36th of 69 Kentucky counties with 30 or more tests for the same period.

Half the tests came in under 3.2 pCi/L and half over it; the single highest reached 36.0 pCi/L. Below the action level, 24 tests (33.3%) came in under 2 pCi/L, against 33.2% statewide, and 22 tests (30.6%) fell between 2 and 4, against 23.1% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 36.1% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential.

CDC's ten-year totals for Christian County went from 63 tests (2005 to 2014) to 72 (2008 to 2017), the share going from 41.3% to 36.1%.

Christian County against Kentucky, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Christian County
Christian County7236.1%3.2 pCi/LThis county
Kentucky, pooled120 counties, pooled28,79343.7%Not pooled+7.6 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−0.4 points
Meade Countyhighest in the state11768.4%8.2 pCi/L+32.3 points
Marshall Countylowest in the state8510.6%1.5 pCi/L−25.5 points
Caldwell County, KYborders it2040.0%3.7 pCi/L+3.9 points
Montgomery County, TNborders it59733.8%2.3 pCi/L−2.3 points
Stewart County, TNborders it9526.3%2.1 pCi/L−9.8 points
Trigg County, KYborders it4522.2%2.4 pCi/L−13.9 points
Todd County, KYborders it6217.7%1.8 pCi/L−18.4 points
Muhlenberg County, KYborders it1717.6%2.3 pCi/L−18.5 points
Hopkins County, KYborders it429.5%1.7 pCi/L−26.6 points
Where Christian County's reported results fell, 2008 to 2017, laboratory, beside Kentucky and the United States
ResultChristian County testsChristian County shareKentucky shareU.S. shareAgainst Kentucky
Under 2 pCi/L2433.3%33.2%39.6%+0.1 points
2 to 4 pCi/L2230.6%23.1%24.7%+7.5 points
4 pCi/L and above2636.1%43.7%35.7%−7.6 points
Christian County ranked among the 69 Kentucky counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Mercer County31 of 6928838.2%2.7 pCi/L
Shelby County32 of 6940737.6%3.0 pCi/L
Oldham County33 of 6980337.1%2.7 pCi/L
Henry County34 of 694136.6%3.2 pCi/L
Owen County35 of 695836.2%2.5 pCi/L
Christian County36 of 697236.1%3.2 pCi/L
Lincoln County37 of 6913535.6%2.8 pCi/L
Grant County38 of 697833.3%2.5 pCi/L
Casey County39 of 694332.6%3.1 pCi/L
Simpson County40 of 6912632.5%2.6 pCi/L
Green County41 of 693132.3%2.5 pCi/L
Christian County ten-year laboratory totals, against Kentucky's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestKentucky, pooledChange from the row before
2008 to 20177236.1%3.2 pCi/L36.0 pCi/L43.7%−3.0 points
2007 to 20166939.1%3.2 pCi/L36.0 pCi/L45.1%−3.3 points
2006 to 20156642.4%3.2 pCi/L36.0 pCi/L46.4%+1.1 points
2005 to 20146341.3%3.2 pCi/L36.0 pCi/L47.3%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Christian County, Geology

The ground under Christian County

Predicted

USGS's geologic map puts all of Christian County's mapped land in one class: moderate radon potential. The map puts 87.5% of Christian County in the area it calls Mississippian Plateau and 12.4% in Western Coalfield. USGS gives the first a radon index of 11 and the second 9, both in the moderate band (9 to 11).

USGS's geologic areas under Christian County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Mississippian PlateauMississippian marine limestones, dolomites, marine sandstones, siltstones, and shales.Moderate1187.5%
Western CoalfieldLimestones, shale, siltstone, and coal beds.Moderate912.4%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Christian County beside the ground around it

Across Kentucky 18.2% of the land is rated high; none of Christian County's is. Of the 7 counties that border it, 2 have more high-potential ground, Stewart County, TN the most at 17.3%.

Share of land by USGS radon potential: Christian County, the 7 counties bordering it and Kentucky
AreaEPA zoneLow potentialModerate potentialHigh potential
Christian CountyZone 2None100%None
Todd CountyZone 2None100%None
Trigg CountyZone 2None100%None
Caldwell CountyZone 2None100%None
Muhlenberg CountyZone 2None100%None
Hopkins CountyZone 2None100%None
Montgomery County, TNZone 2None94.9%5.1%
Stewart County, TNZone 2None82.7%17.3%
Kentucky120 counties, pooled by land areaVaries5.7%76.1%18.2%

The map rates the ground, not the air in any home.

Local help

Christian County, Local resources

Radon testing and mitigation in Christian County

What Kentucky's program says
Phone
502-782-2782
Email
Radon@ky.gov

What it means

Christian County, Questions

Questions about radon in Christian County

Are radon levels high in Christian County?

Over the 2008 to 2017 laboratory totals, 36.1% of the radon tests reported to CDC for Christian County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.2 pCi/L. Of 69 Kentucky counties with 30 or more tests for the same period, 35 reported a higher share; pooled, the state comes to 43.7%.

Which counties border Christian County?

Christian County borders 7 counties: Todd County, KY, Trigg County, KY, Caldwell County, KY, Muhlenberg County, KY, Hopkins County, KY, Montgomery County, TN and Stewart County, TN.

Products

Christian County, Products

Testing a home in Christian County

In Christian County, 36.1% of 72 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 Christian County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Christian County homes, compared

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Christian County, Bordering counties

Counties bordering Christian County

Calculated by Radon411

Christian County, Cities and towns

Cities and towns in Christian County

About 70,115 people live in Christian County by the Census Bureau's estimate for July 1, 2025, 2,637 fewer than in 2020 (−3.6%). That works out to 98 people per square mile of land. Its largest town, Hopkinsville, has 30,411 residents, 43.4% of the total. Together its 5 incorporated places hold 56.9% of those residents; the other 43.1% live outside any of them. Reported testing is thin here: 72 tests over 2008 to 2017, or 1.0 for every 1,000 residents (2025 estimate), where Kentucky as a whole comes to 6.3.

From Hopkinsville to LaFayette, CDC publishes no figure by town: each reads Christian County's.

The cities and towns in Christian County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Hopkinsville30,411−2.4%43.4%
Oak Grove7,830−1.4%11.2%
Pembroke869+1.3%1.2%
Crofton628−4.6%0.9%
LaFayette172−3.4%0.2%

5 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).

Christian County, Homes

Homes in Christian County

Of Christian County's 29,307 homes, 66% are detached houses, against 68% across Kentucky; 9% are in buildings of five or more homes. Half of its homes were built before 1984, close to Kentucky's 1982: 20% date from before 1960 and 26% from 2000 or later. 52% 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 in Christian County, Kentucky, 2019 to 2023
HomesChristian CountyKentucky
Housing units29,3072,010,655
Detached houses66%68%
In buildings of 5 or more9%12%
Mobile homes9%11%
Built before 196020%22%
Built since 200026%24%
Middle year built19841982
Owner-occupied52%68%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.