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Radon Levels in Boyle County, Kentucky

EPA puts Boyle County in Zone 1, its highest radon zone, and high results are common there: 53.9% of the 492 radon tests reported to CDC (2008 to 2017, laboratory totals) came back 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

    53.9%

    10.2 pts above KY

    Boyle
    53.9%
    Kentucky
    43.7%

    492 tests, 2008 to 2017

  • Median result

    4.4pCi/L

    Action level reached

    Boyle
    4.4 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    492

    13th of 69 by tests

    Boyle
    492
    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

    11 of 69

    Top quarter

    Boyle
    53.9%
    Meade
    68.4%

    By share, of 69 with 30+ tests

Read a result for Boyle County

Starts at Boyle County's median, 4.4 pCi/L

4.4pCi/L

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

EPA’s reading of 4.4 pCi/L

At or above 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 at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. Boyle County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Boyle County, At a glance

Boyle County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Boyle 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 54% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Boyle County, 2008 to 2017, laboratory

Reported results by concentration band, Boyle County, 2008 to 2017, laboratory
Under 2 pCi/L: 23%2 to 4 pCi/L: 23%4 pCi/L and above: 54%

Of 492 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Boyle County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L11523.4%
2 to 4 pCi/L11222.8%
4 pCi/L and above26553.9%
What these figures count

These are the 492 tests reported to CDC for Boyle 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

Boyle County, Compared

Boyle County radon figures, compared

Calculated by Radon411

More than half: 53.9% of the 492 radon tests reported to CDC for Boyle County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 11th of 69 Kentucky counties with 30 or more tests for the same period. That is 10.2 points above the 43.7% pooled from 120 Kentucky counties.

The median result, 4.4 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 94.8 pCi/L. The rest split 23.4% under 2 pCi/L and 22.8% from 2 to 4 (Kentucky: 33.2% and 23.1%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 53.9% share point the same way here.

No bordering county with a figure for the same period reported a higher share; the closest is Marion County at 48.6%, the lowest Washington County at 27.3%. Statewide for the same period, Meade County reported the highest share (68.4%) and Hopkins County the lowest (9.5%).

CDC's ten-year totals for Boyle County went from 416 tests (2005 to 2014) to 492 (2008 to 2017), the share going from 54.8% to 53.9%.

Nationally, every county with a figure for the same period pools to 35.7%; Boyle County sits 18.2 points above it. CDC also counts 34 tests taken after mitigation in Boyle County for the same period: tests in homes where a fix was already in.

Boyle County against Kentucky, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Boyle County
Boyle County49253.9%4.4 pCi/LThis county
Kentucky, pooled120 counties, pooled28,79343.7%Not pooled−10.2 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−18.2 points
Meade Countyhighest in the state11768.4%8.2 pCi/L+14.5 points
Hopkins Countylowest in the state429.5%1.7 pCi/L−44.4 points
Marion County, KYborders it17748.6%3.9 pCi/L−5.3 points
Garrard County, KYborders it16439.6%2.6 pCi/L−14.3 points
Mercer County, KYborders it28838.2%2.7 pCi/L−15.7 points
Lincoln County, KYborders it13535.6%2.8 pCi/L−18.3 points
Casey County, KYborders it4332.6%3.1 pCi/L−21.3 points
Washington County, KYborders it4427.3%2.4 pCi/L−26.6 points
Where Boyle County's reported results fell, 2008 to 2017, laboratory, beside Kentucky and the United States
ResultBoyle County testsBoyle County shareKentucky shareU.S. shareAgainst Kentucky
Under 2 pCi/L11523.4%33.2%39.6%−9.8 points
2 to 4 pCi/L11222.8%23.1%24.7%−0.3 points
4 pCi/L and above26553.9%43.7%35.7%+10.2 points
Boyle 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
Pulaski County6 of 6939559.5%5.1 pCi/L
Woodford County7 of 6934257.9%4.9 pCi/L
Taylor County8 of 699157.1%4.4 pCi/L
Jessamine County9 of 6978955.5%4.7 pCi/L
Fayette County10 of 695,26354.5%4.5 pCi/L
Boyle County11 of 6949253.9%4.4 pCi/L
Bourbon County12 of 6912753.5%4.8 pCi/L
Monroe County13 of 698752.9%4.6 pCi/L
Barren County14 of 6918651.6%4.0 pCi/L
Montgomery County15 of 6910551.4%4.1 pCi/L
Hardin County16 of 6942950.3%4.0 pCi/L
Boyle County ten-year laboratory totals, against Kentucky's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestKentucky, pooledChange from the row before
2008 to 201749253.9%4.4 pCi/L94.8 pCi/L43.7%+1.1 points
2007 to 201647952.8%4.3 pCi/L94.8 pCi/L45.1%−2.1 points
2006 to 201544354.9%4.4 pCi/L94.8 pCi/L46.4%+0.1 points
2005 to 201441654.8%4.4 pCi/L94.8 pCi/L47.3%First on file

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

Boyle County, Geology

The ground under Boyle County

Predicted

USGS's geologic map splits Boyle County: 54.2% of its land is high radon potential and 45.8% moderate. The map puts 45.8% of Boyle County in the area it calls Outer Bluegrass and 42.3% in New Albany-Chattanooga Shale, with one smaller area beside them. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 14, in the high band (12 to 17).

USGS's geologic areas under Boyle County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Outer BluegrassOrdovician-Devonian limestone and shale.Moderate1145.8%
New Albany-Chattanooga ShaleDevonian/Mississippian Black shale.High1442.3%
Inner BluegrassOrdovician limestones, dolomites and shales.High1311.9%

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

Boyle County beside the ground around it

Boyle County has more high-potential ground than Kentucky as a whole: 54.2% of its land against 18.2%. Of the 6 counties that border it, 4 have more high-potential ground, Casey County the most at 100%.

Share of land by USGS radon potential: Boyle County, the 6 counties bordering it and Kentucky
AreaEPA zoneLow potentialModerate potentialHigh potential
Boyle CountyZone 1None45.8%54.2%
Mercer CountyZone 1None39.8%60.2%
Garrard CountyZone 2None50.3%49.7%
Lincoln CountyZone 1None23.3%76.7%
Casey CountyZone 1NoneNone100%
Washington CountyZone 2None100%None
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

Boyle County, Local resources

Radon testing and mitigation in Boyle County

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

What it means

Boyle County, Questions

Questions about radon in Boyle County

Are radon levels high in Boyle County?

Over the 2008 to 2017 laboratory totals, 53.9% of the radon tests reported to CDC for Boyle County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.4 pCi/L. Of 69 Kentucky counties with 30 or more tests for the same period, 10 reported a higher share; pooled, the state comes to 43.7%.

Which counties border Boyle County?

Boyle County borders 6 counties: Mercer County, Garrard County, Lincoln County, Casey County, Washington County and Marion County.

Products

Boyle County, Products

Testing a home in Boyle County

In Boyle County, 53.9% of 492 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 Boyle 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

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

Explore

Boyle County, Bordering counties

Counties bordering Boyle County

Calculated by Radon411

Boyle County, Cities and towns

Cities and towns in Boyle County

The Census Bureau estimates 31,632 residents in Boyle County for July 1, 2025, 878 more than in 2020 (+2.9%). That works out to 175 people per square mile of land. Danville alone is home to 17,736 of them, 56.1% of the total. Testing is reported here more often than across the state: CDC's 492 reported tests for 2008 to 2017 come to 15.6 for every 1,000 residents (2025 estimate), against 6.3 for Kentucky.

From Danville to Perryville, CDC publishes no figure by town: each reads Boyle County's.

The cities and towns in Boyle County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Danville17,736+2.4%56.1%
Junction Cityextends beyond Boyle County2,346+3.1%Counted whole
Perryville806+2.4%2.5%

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). A place that extends beyond Boyle County is counted whole, so it has no share.

Boyle County, Homes

Homes in Boyle County

Boyle County is a place of houses on their own lots: 76% of its 12,969 homes are detached single-family houses, against 68% across Kentucky. Half of its homes were built before 1977, close to Kentucky's 1982: 24% date from before 1960 and 19% from 2000 or later. 69% 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 Boyle County, Kentucky, 2019 to 2023
HomesBoyle CountyKentucky
Housing units12,9692,010,655
Detached houses76%68%
In buildings of 5 or more6%12%
Mobile homes5%11%
Built before 196024%22%
Built since 200019%24%
Middle year built19771982
Owner-occupied69%68%

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