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Radon Levels in Todd County, Kentucky

EPA puts Todd County in Zone 2, its middle radon zone, and 17.7% of its 62 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

    17.7%

    26.0 pts below KY

    Todd
    17.7%
    Kentucky
    43.7%

    62 tests, 2008 to 2017

  • Median result

    1.8pCi/L

    Below action level

    Todd
    1.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    62

    48th of 69 by tests

    Todd
    62
    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

    65 of 69

    Lowest quarter

    Todd
    17.7%
    Meade
    68.4%

    By share, of 69 with 30+ tests

Read a result for Todd County

Starts at Todd County's median, 1.8 pCi/L

1.8pCi/L

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

EPA’s reading of 1.8 pCi/L

Below 2 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 below 2 pCi/L, the level at which EPA says a fix should be considered. Todd County's median reported result, 2008 to 2017.

Interpret this reading

The data

Todd County, At a glance

Todd County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Todd 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 Todd County, 2008 to 2017, laboratory

Reported results by concentration band, Todd County, 2008 to 2017, laboratory
Under 2 pCi/L: 55%2 to 4 pCi/L: 27%4 pCi/L and above: 18%

Of 62 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Todd County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L3454.8%
2 to 4 pCi/L1727.4%
4 pCi/L and above1117.7%
What these figures count

These are the 62 tests reported to CDC for Todd 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

Todd County, Compared

Todd County radon figures, compared

Calculated by Radon411

Todd County's 62 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.8 pCi/L and a maximum of 29.0 pCi/L, and 17.7% reached 4 pCi/L. Kentucky as a whole (120 Kentucky counties, pooled) comes to 43.7%: 26.0 points higher than here.

Among its state's counties it ranks 65th 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, 34 tests (54.8%) came in under 2 pCi/L, against 33.2% statewide, and 17 tests (27.4%) fell between 2 and 4, against 23.1% statewide. CDC's ten-year totals for Todd County went from 37 tests (2005 to 2014) to 62 (2008 to 2017), the share going from 21.6% to 17.7%.

EPA's 1993 zone map puts Todd 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 28.9% in Robertson County, TN to 36.1% in Christian County.

Todd County against Kentucky, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Todd County
Todd County6217.7%1.8 pCi/LThis county
Kentucky, pooled120 counties, pooled28,79343.7%Not pooled+26.0 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+18.0 points
Meade Countyhighest in the state11768.4%8.2 pCi/L+50.7 points
Hopkins Countylowest in the state429.5%1.7 pCi/L−8.2 points
Christian County, KYborders it7236.1%3.2 pCi/L+18.4 points
Montgomery County, TNborders it59733.8%2.3 pCi/L+16.1 points
Logan County, KYborders it7931.6%2.4 pCi/L+13.9 points
Robertson County, TNborders it27328.9%1.9 pCi/L+11.2 points
Muhlenberg County, KYborders it1717.6%2.3 pCi/L−0.1 points
Where Todd County's reported results fell, 2008 to 2017, laboratory, beside Kentucky and the United States
ResultTodd County testsTodd County shareKentucky shareU.S. shareAgainst Kentucky
Under 2 pCi/L3454.8%33.2%39.6%+21.6 points
2 to 4 pCi/L1727.4%23.1%24.7%+4.3 points
4 pCi/L and above1117.7%43.7%35.7%−26.0 points
Todd 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
Menifee County59 of 694122.0%1.4 pCi/L
Edmonson County60 of 696221.0%1.6 pCi/L
Daviess County61 of 6914520.0%1.8 pCi/L
Breathitt County62 of 694719.1%1.7 pCi/L
Rowan County63 of 697418.9%1.6 pCi/L
Boyd County64 of 6916817.9%2.1 pCi/L
Todd County65 of 696217.7%1.8 pCi/L
Pike County66 of 698217.1%1.1 pCi/L
Greenup County67 of 6910412.5%2.0 pCi/L
Marshall County68 of 698510.6%1.5 pCi/L
Hopkins County69 of 69429.5%1.7 pCi/L
Todd County ten-year laboratory totals, against Kentucky's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestKentucky, pooledChange from the row before
2008 to 20176217.7%1.8 pCi/L29.0 pCi/L43.7%Level
2007 to 20166217.7%1.8 pCi/L29.0 pCi/L45.1%−3.9 points
2006 to 20153721.6%2.4 pCi/L29.0 pCi/L46.4%Level
2005 to 20143721.6%2.4 pCi/L29.0 pCi/L47.3%First on file

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

Todd County, Geology

The ground under Todd County

Predicted

USGS's geologic map puts all of Todd County's mapped land in one class: moderate radon potential. The map puts 87.5% of Todd County in the area it calls Mississippian Plateau and 12.1% 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 Todd 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.Moderate912.1%

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

Todd County beside the ground around it

Across Kentucky 18.2% of the land is rated high; none of Todd County's is. Of the 5 counties that border it, 2 have more high-potential ground, Montgomery County, TN the most at 5.1%.

Share of land by USGS radon potential: Todd County, the 5 counties bordering it and Kentucky
AreaEPA zoneLow potentialModerate potentialHigh potential
Todd CountyZone 2None100%None
Christian CountyZone 2None100%None
Logan CountyZone 2None100%None
Montgomery County, TNZone 2None94.9%5.1%
Muhlenberg CountyZone 2None100%None
Robertson County, TNZone 2None96.6%3.4%
Kentucky120 counties, pooled by land areaVaries5.7%76.1%18.2%

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

Local help

Todd County, Local resources

Radon testing and mitigation in Todd County

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

What it means

Todd County, Questions

Questions about radon in Todd County

Are radon levels high in Todd County?

Over the 2008 to 2017 laboratory totals, 17.7% of the radon tests reported to CDC for Todd County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.8 pCi/L. Of 69 Kentucky counties with 30 or more tests for the same period, 64 reported a higher share; pooled, the state comes to 43.7%.

Which counties border Todd County?

Todd County borders 5 counties: Christian County, KY, Logan County, KY, Montgomery County, TN, Muhlenberg County, KY and Robertson County, TN.

Products

Todd County, Products

Testing a home in Todd County

In Todd County, 17.7% of 62 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 Todd County; a long-term test tells the year-round average.

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Best radon monitors for Todd County homes, compared

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Todd County, Bordering counties

Counties bordering Todd County

Calculated by Radon411

Todd County, Cities and towns

Cities and towns in Todd County

Todd County is growing: the Census Bureau puts it at 12,972 residents on July 1, 2025, up 5.6% from 12,283 in 2020. That works out to 35 people per square mile of land. No town dominates: Elkton, the largest, has 2,387 residents, 18.4% of the total. Together its 3 incorporated places hold 31.8% of those residents; the other 68.2% live outside any of them. CDC's 62 reported tests for 2008 to 2017 work out to 4.8 per 1,000 residents (2025 estimate), close to Kentucky's 6.3.

From Elkton to Trenton, CDC publishes no figure by town: each reads Todd County's.

The cities and towns in Todd County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Elkton2,387+15.8%18.4%
Guthrie1,395+4.3%10.8%
Trenton340+2.1%2.6%

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).

Todd County, Homes

Homes in Todd County

Todd County is a place of houses on their own lots: 77% of its 5,160 homes are detached single-family houses, against 68% across Kentucky. Half of its homes were built before 1983, close to Kentucky's 1982: 20% date from before 1960 and 25% from 2000 or later. 74% 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 Todd County, Kentucky, 2019 to 2023
HomesTodd CountyKentucky
Housing units5,1602,010,655
Detached houses77%68%
In buildings of 5 or more5%12%
Mobile homes15%11%
Built before 196020%22%
Built since 200025%24%
Middle year built19831982
Owner-occupied74%68%

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