Skip to content
RADON411

Locations and reports

Kentucky Radon Map and Levels by County

Kentucky's counties span all three EPA radon zones. 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

    43.7%

    8.0 pts above U.S.

    Kentucky
    43.7%
    U.S.
    35.7%

    28,793 tests across 120 counties, 2008 to 2017

  • Rank among states

    10 of 47

    Ten highest states

    Kentucky
    43.7%
    North Dakota
    59.3%

    By share, every state pooled the same way, 2008 to 2017

  • Counties in EPA Zone 1

    30 of 120

    Some at highest potential

    Zone 1
    30
    Zone 2
    82

    Most counties sit in Zone 2; Zone 1 is the highest potential

  • Highest county

    68.4%

    Meade County

    Meade
    68.4%
    Hopkins
    9.5%

    Counties with 30+ tests, 2008 to 2017

Read a result for Kentucky

Starts at EPA's action level

4.0pCi/L

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

EPA’s reading of 4.0 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. 43.7% of Kentucky's reported tests reached 4 pCi/L, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Kentucky, At a glance

Kentucky at a glance

Predicted: EPA radon zone

120 of 120 counties classified

EPA classifies counties, not states. Of the 120 counties in Kentucky with a zone, 30 are in Zone 1, 82 in Zone 2 and 8 in Zone 3.

  • Zone 1: Highest predicted potentialgreater than 4 pCi/L30 of 120 counties · 25.0%
  • Zone 2: Moderate predicted potential2 to 4 pCi/L82 of 120 counties · 68.3%
  • Zone 3: Lower predicted potentialless than 2 pCi/L8 of 120 counties · 6.7%

An EPA radon zone predicts a whole county. It is not intended to determine whether any individual home should be tested: homes with elevated levels occur in all three zones, and EPA recommends testing every home regardless of zone.

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

CDC test figures, county by county

CDC publishes Kentucky's radon test figures by county: 120 of its 120 counties have one. Each one's share is in the county list.

How to read these figures

Kentucky, Compared

Kentucky radon figures, compared

Calculated by Radon411
Kentucky, 2008 to 2017, laboratory
43.7%
of 28,793 tests at or above 4 pCi/L, pooled
Against the U.S.
+8.0points
35.7% pooled
Rank among the states
10 of 47
1 is the highest share
Counties with 30 or more tests
69
Highest
68.4%
Meade County
Lowest
9.5%
Hopkins County

Kentucky pools to 43.7%: that share of 28,793 reported tests from 120 counties over the 2008 to 2017 laboratory totals reached EPA's action level. Nationally the pooled share is 35.7%: 8.0 points lower than here.

Among 47 states pooled the same way it ranks 10th, with Wyoming (44.3%) above it and Minnesota (43.4%) below. Meade County reports the highest share (68.4% of 117 tests) and Hopkins County the lowest (9.5%); the most tests came from Jefferson County, 6,590 of them at 39.4%.

Across its 4 overlapping ten-year totals, the share went from 47.3% (2005 to 2014) to 43.7% (2008 to 2017), down 3.6 points, with 2005 to 2014 the highest at 47.3%. By band, 16 counties at 50% or more, 29 counties at 30% to 50%, 21 counties at 15% to 30%, 3 counties at 5% to 15%.

EPA's 1993 map puts 30 of its 120 classified counties in Zone 1; against that, 43.7% of the tests reported since reached 4 pCi/L.

Kentucky ranked among 47 states by pooled share of tests at or above 4 pCi/L, 2008 to 2017, laboratory
StateRankCountiesTestsAt or above 4 pCi/L
Ohio5 of 478898,84052.3%
Colorado6 of 476396,36747.0%
Wisconsin7 of 477268,10446.9%
Montana8 of 47519,89345.5%
Wyoming9 of 47237,63844.3%
Kentucky10 of 4712028,79343.7%
Minnesota11 of 4787130,91243.4%
Illinois12 of 47102108,90943.1%
Utah13 of 472828,34241.9%
Pennsylvania14 of 4767203,04541.7%
Idaho15 of 474412,96141.5%
Kentucky's highest and lowest counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/L
Meade County1 of 6911768.4%
Nelson County2 of 6930466.1%
Hart County3 of 698465.5%
Warren County4 of 691,62461.5%
Wayne County5 of 696460.9%
Pulaski County6 of 6939559.5%
Woodford County7 of 6934257.9%
Taylor County8 of 699157.1%
Jessamine County9 of 6978955.5%
Fayette County10 of 695,26354.5%
Hopkins County69 of 69429.5%
Marshall County68 of 698510.6%
Greenup County67 of 6910412.5%
Pike County66 of 698217.1%
Todd County65 of 696217.7%
Kentucky's counties with 30 or more tests, by their own share at or above 4 pCi/L, 2008 to 2017, laboratory
ShareCountiesTheir testsFor example
50% or more1610,499Meade County, Nelson County, Hart County
30% to 50%2914,053Marion County, Bullitt County, Clinton County
15% to 30%213,283Allen County, Clark County, Grayson County
5% to 15%3231Greenup County, Marshall County, Hopkins County
Under 5%00None
Kentucky ten-year laboratory totals, pooled, against the United States
PeriodCountiesTestsAt or above 4 pCi/LUnited StatesChange from the row before
2008 to 201712028,79343.7%35.7%−1.4 points
2007 to 201612026,15445.1%35.8%−1.3 points
2006 to 201512023,26246.4%36.3%−0.9 points
2005 to 201411720,40347.3%36.0%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period. CDC publishes no state or national figure.

Kentucky, Counties

Kentucky counties by EPA zone

Predicted

The map of Kentucky, then its 120 counties zone by zone, each with its reported share at or above 4 pCi/L and a report of its own.

Kentucky radon map by county: EPA radon zones. Map of Kentucky's 120 counties shaded by EPA radon zone: Zone 1 in red-orange, Zone 2 in amber, Zone 3 in pale sand. 30 in Zone 1, 82 in Zone 2, 8 in Zone 3.
Kentucky radon map by countyEPA radon zones for Kentucky's counties: 30 counties in Zone 1, 82 counties in Zone 2, 8 counties in Zone 3.A prediction for each county, not a reading of any home; elevated homes occur in all three zones.

The 12 highest in Kentucky, 2008 to 2017

Zone 1: highest predicted potential30

Local help

Kentucky, Local resources

Local resources in Kentucky

Who to ask in Kentucky: its radon program, test kits and professionals.

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

What it means

Kentucky, Questions

Questions about radon in Kentucky

Is radon a problem in Kentucky?

Kentucky has 120 counties on EPA's Map of Radon Zones: Zone 1, the highest predicted potential, for 30; Zone 2 for 82; Zone 3 for 8. Pooled from 120 counties, 43.7% of the 28,793 radon tests reported to CDC over the 2008 to 2017 laboratory totals were at or above 4 pCi/L, 10th of 47 states.

Which Kentucky counties are in EPA radon Zone 1?

30 counties are in Zone 1: Adair County, Allen County, Barren County, Bourbon County, Boyle County, Bullitt County, Casey County, Clark County, and 22 more in the county table on this page.

Who does radon mitigation in Kentucky?

Radon411's Kentucky directory lists 8 radon businesses for testing, mitigation or both, each with the licensing list it was read from.

Which Kentucky counties have the highest radon?

By the share of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory: Meade County 68.4% (117 tests), Nelson County 66.1% (304 tests), Hart County 65.5% (84 tests), Warren County 61.5% (1,624 tests), Wayne County 60.9% (64 tests).

Which EPA region is Kentucky in?

Kentucky is in EPA Region 4: Southeast.

Products

Kentucky, Products

Testing a home in Kentucky

43.7% of the 28,793 tests reported to CDC for Kentucky over the 2008 to 2017 laboratory totals reached 4 pCi/L: a short-term kit (2 to 90 days) gives a first answer in days, a long-term test the year-round average. A short-term kit (2 to 90 days) is the quick first check for a home in Kentucky; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Kentucky homes, compared

Explore

Cities in Kentucky with their own page

Radon data is published by county, not by city. Each city page sets the figures of the counties the city lies in side by side.