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Radon Levels in Casey County, Kentucky

EPA puts Casey County in Zone 1, its highest radon zone, and 32.6% of its 43 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

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  • Share at 4+ pCi/L

    32.6%

    11.1 pts below KY

    Casey
    32.6%
    Kentucky
    43.7%

    43 tests, 2008 to 2017

  • Median result

    3.1pCi/L

    Below action level

    Casey
    3.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    43

    56th of 69 by tests

    Casey
    43
    Jefferson
    6,590

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Kentucky

    39 of 69

    Middle half

    Casey
    32.6%
    Meade
    68.4%

    By share, of 69 with 30+ tests

Read a result for Casey County

Starts at Casey County's median, 3.1 pCi/L

3.1pCi/L

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

EPA’s reading of 3.1 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. Casey County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Casey County, At a glance

Casey County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Casey County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

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 Casey County, 2008 to 2017, laboratory

Reported results by concentration band, Casey County, 2008 to 2017, laboratory
Under 2 pCi/L: 46%2 to 4 pCi/L: 21%4 pCi/L and above: 33%

Of 43 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Casey County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L2046.5%
2 to 4 pCi/L920.9%
4 pCi/L and above1432.6%
What these figures count

These are the 43 tests reported to CDC for Casey 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

Casey County, Compared

Casey County radon figures, compared

Calculated by Radon411

In Casey County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (14 of 43) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 3.1 points lower. Across 120 Kentucky counties pooled together, 43.7% of tests reached that level, so Casey County runs 11.1 points below its state.

Of 7 neighbours with a figure, 6 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 25.0% (Russell County) to 59.5% (Pulaski County). By share, Casey County is 39th of 69 Kentucky counties with 30 or more tests for the same period.

Half the tests came in under 3.1 pCi/L and half over it; the single highest reached 43.0 pCi/L. Below the action level, 20 tests (46.5%) came in under 2 pCi/L, against 33.2% statewide, and 9 tests (20.9%) fell between 2 and 4, against 23.1% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 32.6% share point the same way here. USGS geology rates 100% of the county's land high radon potential.

CDC's ten-year totals for Casey County went from 26 tests (2005 to 2014) to 43 (2008 to 2017), the share going from 15.4% to 32.6%.

Casey County against Kentucky, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Casey County
Casey County4332.6%3.1 pCi/LThis county
Kentucky, pooled120 counties, pooled28,79343.7%Not pooled+11.1 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+3.1 points
Meade Countyhighest in the state11768.4%8.2 pCi/L+35.8 points
Hopkins Countylowest in the state429.5%1.7 pCi/L−23.1 points
Pulaski County, KYborders it39559.5%5.1 pCi/L+26.9 points
Taylor County, KYborders it9157.1%4.4 pCi/L+24.5 points
Boyle County, KYborders it49253.9%4.4 pCi/L+21.3 points
Marion County, KYborders it17748.6%3.9 pCi/L+16.0 points
Adair County, KYborders it5343.4%3.8 pCi/L+10.8 points
Lincoln County, KYborders it13535.6%2.8 pCi/L+3.0 points
Russell County, KYborders it3225.0%2.9 pCi/L−7.6 points
Where Casey County's reported results fell, 2008 to 2017, laboratory, beside Kentucky and the United States
ResultCasey County testsCasey County shareKentucky shareU.S. shareAgainst Kentucky
Under 2 pCi/L2046.5%33.2%39.6%+13.3 points
2 to 4 pCi/L920.9%23.1%24.7%−2.2 points
4 pCi/L and above1432.6%43.7%35.7%−11.1 points
Casey 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
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
Carter County42 of 694131.7%2.2 pCi/L
Logan County43 of 697931.6%2.4 pCi/L
Spencer County44 of 6916631.3%2.5 pCi/L
Casey County ten-year laboratory totals, against Kentucky's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestKentucky, pooledChange from the row before
2008 to 20174332.6%3.1 pCi/L43.0 pCi/L43.7%+4.8 points
2007 to 20163627.8%2.9 pCi/L43.0 pCi/L45.1%+7.2 points
2006 to 20153420.6%1.9 pCi/L43.0 pCi/L46.4%+5.2 points
2005 to 20142615.4%1.6 pCi/L11.4 pCi/L47.3%First on file

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

Casey County, Geology

The ground under Casey County

Predicted

USGS's geologic map puts all of Casey County's mapped land in one class: high radon potential. The map puts 79.7% of Casey County in the area it calls Eastern Pennyroyal and 20.3% in New Albany-Chattanooga Shale. USGS gives the first a radon index of 12 and the second 14, both in the high band (12 to 17).

USGS's geologic areas under Casey County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Eastern PennyroyalMarine shale, sandstone and limestone.High1279.7%
New Albany-Chattanooga ShaleDevonian/Mississippian Black shale.High1420.3%

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

Casey County beside the ground around it

Casey County has more high-potential ground than Kentucky as a whole: 100% of its land against 18.2%. Of the 7 counties that border it, none has as large a share of high-potential ground; Adair County comes nearest at 100%.

Share of land by USGS radon potential: Casey County, the 7 counties bordering it and Kentucky
AreaEPA zoneLow potentialModerate potentialHigh potential
Casey CountyZone 1NoneNone100%
Lincoln CountyZone 1None23.3%76.7%
Taylor CountyZone 1None13.6%86.4%
Boyle CountyZone 1None45.8%54.2%
Russell CountyZone 1NoneNone100%
Adair CountyZone 1NoneNone100%
Pulaski CountyZone 1None68.7%31.3%
Marion CountyZone 1None32.3%67.7%
Kentucky120 counties, pooled by land areaVaries5.7%76.1%18.2%

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

Local help

Casey County, Local resources

Radon testing and mitigation in Casey County

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

What it means

Casey County, Questions

Questions about radon in Casey County

Are radon levels high in Casey County?

Over the 2008 to 2017 laboratory totals, 32.6% of the radon tests reported to CDC for Casey County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.1 pCi/L. Of 69 Kentucky counties with 30 or more tests for the same period, 38 reported a higher share; pooled, the state comes to 43.7%.

Which counties border Casey County?

Casey County borders 7 counties: Lincoln County, Taylor County, Boyle County, Russell County, Adair County, Pulaski County and Marion County.

Products

Casey County, Products

Testing a home in Casey County

In Casey County, 32.6% of 43 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 43.7% pooled across Kentucky. In Zone 1 the year-round level in Casey 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

Casey County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Casey County

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Casey County, Bordering counties

Counties bordering Casey County

Calculated by Radon411

Casey County, Cities and towns

Cities and towns in Casey County

The Census Bureau estimates 16,205 residents in Casey County for July 1, 2025, 279 more than in 2020 (+1.8%). That works out to 36 people per square mile of land. Liberty, its one incorporated place, has 2,021 residents, 12.5% of the total. Reported testing is thin here: 43 tests over 2008 to 2017, or 2.7 for every 1,000 residents (2025 estimate), where Kentucky as a whole comes to 6.3.

Liberty is the one incorporated place here; CDC publishes no figure by town, so it reads Casey County's.

Liberty, Casey County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Liberty2,021−0.3%12.5%

One incorporated place, 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).

Casey County, Homes

Homes in Casey County

Of Casey County's 7,401 homes, 73% are detached houses, against 68% across Kentucky; 23% are mobile homes. Half of its homes were built before 1985, close to Kentucky's 1982: 14% date from before 1960 and 23% from 2000 or later. Owners live in 79% of the occupied homes (Kentucky: 68%), so for most households a test and a fix are their own to order.

Homes in Casey County, Kentucky, 2019 to 2023
HomesCasey CountyKentucky
Housing units7,4012,010,655
Detached houses73%68%
In buildings of 5 or more2%12%
Mobile homes23%11%
Built before 196014%22%
Built since 200023%24%
Middle year built19851982
Owner-occupied79%68%

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