Skip to content
RADON411

Locations and reports

Radon Levels in Pendleton County, Kentucky

EPA puts Pendleton County in Zone 1, its highest radon zone, and 26.5% of its 34 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

    26.5%

    17.2 pts below KY

    Pendleton
    26.5%
    Kentucky
    43.7%

    34 tests, 2008 to 2017

  • Median result

    1.9pCi/L

    Below action level

    Pendleton
    1.9 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    34

    64th of 69 by tests

    Pendleton
    34
    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

    50 of 69

    Middle half

    Pendleton
    26.5%
    Meade
    68.4%

    By share, of 69 with 30+ tests

Read a result for Pendleton County

Starts at Pendleton County's median, 1.9 pCi/L

1.9pCi/L

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

EPA’s reading of 1.9 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. Pendleton County's median reported result, 2008 to 2017.

Interpret this reading

The data

Pendleton County, At a glance

Pendleton County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Pendleton 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: Moderate across 60% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Pendleton County, 2008 to 2017, laboratory
Under 2 pCi/L: 50%2 to 4 pCi/L: 24%4 pCi/L and above: 26%

Of 34 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Pendleton County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1750.0%
2 to 4 pCi/L823.5%
4 pCi/L and above926.5%
What these figures count

These are the 34 tests reported to CDC for Pendleton 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

Pendleton County, Compared

Pendleton County radon figures, compared

Calculated by Radon411

Pendleton County's 34 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.9 pCi/L and a maximum of 45.1 pCi/L, and 26.5% reached 4 pCi/L. Kentucky as a whole (120 Kentucky counties, pooled) comes to 43.7%: 17.2 points higher than here.

Among its state's counties it ranks 50th 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, 17 tests (50.0%) came in under 2 pCi/L, against 33.2% statewide, and 8 tests (23.5%) fell between 2 and 4, against 23.1% statewide. CDC's ten-year totals for Pendleton County went from 32 tests (2005 to 2014) to 34 (2008 to 2017), the share going from 37.5% to 26.5%.

EPA's 1993 zone map puts Pendleton County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 60% of the county's land moderate radon potential.

Next door, the shares run from 26.0% in Kenton County to 50.0% in Clermont County, OH, with Campbell County and Kenton County below Pendleton County.

Pendleton County against Kentucky, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Pendleton County
Pendleton County3426.5%1.9 pCi/LThis county
Kentucky, pooled120 counties, pooled28,79343.7%Not pooled+17.2 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+9.2 points
Meade Countyhighest in the state11768.4%8.2 pCi/L+41.9 points
Hopkins Countylowest in the state429.5%1.7 pCi/L−17.0 points
Clermont County, OHborders it1,36350.0%4.0 pCi/L+23.5 points
Harrison County, KYborders it11146.8%3.4 pCi/L+20.3 points
Grant County, KYborders it7833.3%2.5 pCi/L+6.8 points
Campbell County, KYborders it54326.2%2.3 pCi/L−0.3 points
Kenton County, KYborders it1,16726.0%2.3 pCi/L−0.5 points
Bracken County, KYborders it520.0%2.0 pCi/L−6.5 points
Where Pendleton County's reported results fell, 2008 to 2017, laboratory, beside Kentucky and the United States
ResultPendleton County testsPendleton County shareKentucky shareU.S. shareAgainst Kentucky
Under 2 pCi/L1750.0%33.2%39.6%+16.8 points
2 to 4 pCi/L823.5%23.1%24.7%+0.4 points
4 pCi/L and above926.5%43.7%35.7%−17.2 points
Pendleton 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
Breckinridge County45 of 693231.3%2.5 pCi/L
Allen County46 of 695829.3%1.9 pCi/L
Clark County47 of 6923129.0%2.4 pCi/L
Grayson County48 of 693627.8%2.2 pCi/L
Washington County49 of 694427.3%2.4 pCi/L
Pendleton County50 of 693426.5%1.9 pCi/L
Campbell County51 of 6954326.2%2.3 pCi/L
Kenton County52 of 691,16726.0%2.3 pCi/L
Anderson County53 of 6922625.2%2.2 pCi/L
Mason County54 of 693225.0%2.6 pCi/L
Russell County54 of 693225.0%2.9 pCi/L
Pendleton County ten-year laboratory totals, against Kentucky's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestKentucky, pooledChange from the row before
2008 to 20173426.5%1.9 pCi/L45.1 pCi/L43.7%−2.1 points
2007 to 20163528.6%2.0 pCi/L45.1 pCi/L45.1%−5.7 points
2006 to 20153534.3%2.7 pCi/L45.1 pCi/L46.4%−3.2 points
2005 to 20143237.5%2.9 pCi/L45.1 pCi/L47.3%First on file

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

Pendleton County, Geology

The ground under Pendleton County

Predicted

USGS's geologic map splits Pendleton County: 60.2% of its land is moderate radon potential and 39.8% high. The map puts 60.2% of Pendleton County in the area it calls Outer Bluegrass and 39.8% in Inner Bluegrass. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 13, in the high band (12 to 17).

USGS's geologic areas under Pendleton County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Outer BluegrassOrdovician-Devonian limestone and shale.Moderate1160.2%
Inner BluegrassOrdovician limestones, dolomites and shales.High1339.8%

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

Pendleton County beside the ground around it

Pendleton County has more high-potential ground than Kentucky as a whole: 39.8% of its land against 18.2%. Of the 6 counties that border it, none has as large a share of high-potential ground; Harrison County comes nearest at 34.7%.

Share of land by USGS radon potential: Pendleton County, the 6 counties bordering it and Kentucky
AreaEPA zoneLow potentialModerate potentialHigh potential
Pendleton CountyZone 1None60.2%39.8%
Grant CountyZone 2None100%None
Bracken CountyZone 2None99.1%0.9%
Harrison CountyZone 1None65.3%34.7%
Campbell CountyZone 2None86.3%13.7%
Kenton CountyZone 2None81.3%18.7%
Clermont County, OHZone 2None100%None
Kentucky120 counties, pooled by land areaVaries5.7%76.1%18.2%

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

Local help

Pendleton County, Local resources

Radon testing and mitigation in Pendleton County

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

What it means

Pendleton County, Questions

Questions about radon in Pendleton County

Are radon levels high in Pendleton County?

Over the 2008 to 2017 laboratory totals, 26.5% of the radon tests reported to CDC for Pendleton County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.9 pCi/L. Of 69 Kentucky counties with 30 or more tests for the same period, 49 reported a higher share; pooled, the state comes to 43.7%.

Which counties border Pendleton County?

Pendleton County borders 6 counties: Grant County, KY, Bracken County, KY, Harrison County, KY, Campbell County, KY, Kenton County, KY and Clermont County, OH.

Products

Pendleton County, Products

Testing a home in Pendleton County

In Pendleton County, 26.5% of 34 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 Pendleton 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

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

Explore

Pendleton County, Bordering counties

Counties bordering Pendleton County

Calculated by Radon411

Pendleton County, Cities and towns

Cities and towns in Pendleton County

The Census Bureau estimates 14,800 residents in Pendleton County for July 1, 2025, 159 more than in 2020 (+1.1%). That works out to 53 people per square mile of land. Williamstown, the largest place on its list (4,030 residents in all), extends beyond Pendleton County, so no share of the total is worked out for it. Reported testing is thin here: 34 tests over 2008 to 2017, or 2.3 for every 1,000 residents (2025 estimate), where Kentucky as a whole comes to 6.3.

From Williamstown to Butler, CDC publishes no figure by town: each reads Pendleton County's.

The cities and towns in Pendleton County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Williamstownextends beyond Pendleton County4,030+2.9%Counted whole
Falmouth2,200−0.6%14.9%
Butler633−2.3%4.3%

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 Pendleton County is counted whole, so it has no share.

Pendleton County, Homes

Homes in Pendleton County

Of Pendleton County's 6,285 homes, 68% are detached houses, against 68% across Kentucky; 21% are mobile homes. Half of its homes were built before 1981, close to Kentucky's 1982: 29% date from before 1960 and 22% 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 Pendleton County, Kentucky, 2019 to 2023
HomesPendleton CountyKentucky
Housing units6,2852,010,655
Detached houses68%68%
In buildings of 5 or more4%12%
Mobile homes21%11%
Built before 196029%22%
Built since 200022%24%
Middle year built19811982
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.