Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Butler County, Kentucky
EPA puts Butler County in Zone 2, its middle radon zone, and only 26 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
61.5%
Warren County
- Warren
- 61.5%
- Edmonson
- 21.0%
4 of 6 neighbours have 30+ tests, 2008 to 2017
Nearest county
61.5%
Warren County, 20 miles
- Warren
- 61.5%
- Kentucky
- 43.7%
Share at 4+ pCi/L, 1,624 tests, 2008 to 2017
Ground above low
100.0%
5.7 pts above Kentucky
- Butler
- 100.0%
- Kentucky
- 94.3%
Share of land USGS rates moderate or high potential
Tests reported
26
Too few for a share
- Butler
- 26
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Butler County
Starts at EPA's action level
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
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 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.
The data
Butler County, At a glance
Butler County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Butler County is a
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 Butler County, 2008 to 2017, laboratory
CDC holds 26 reported tests for Butler County over the 2008 to 2017 laboratory totals, with a median of 1.5 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Butler County beside the counties around it is how this page reads it.
What these figures count
Only 26 tests were reported to CDC for Butler County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Butler County, Compared
Butler County radon figures, compared
Calculated by Radon411CDC's largest figure for Butler County rests on 26 tests over the 2008 to 2017 laboratory totals, 1 of them at or above 4 pCi/L, so each test moves its share by 3.8 points and no rank or comparison is drawn from it. Results reached as high as 4.0 pCi/L, with a middle value of 1.5 pCi/L.
Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Warren County reported the largest share at or above 4 pCi/L, 61.5%, and Edmonson County the smallest, 21.0%, with Logan County at 31.6% and Grayson County at 27.8% between. Farther out, Simpson County (33 miles away) at 32.5%, Todd County (38 miles away) at 17.7% and Breckinridge County (41 miles away) at 31.3% have figures too. Pooled across 120 Kentucky counties, 43.7% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Meade County reported the highest share (68.4%) and Hopkins County the lowest (9.5%). EPA's 1993 map puts Butler County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Butler County, Geology
The ground under Butler County
PredictedUSGS's geologic map puts all of Butler County's mapped land in one class: moderate radon potential. The map puts 76.8% of Butler County in the area it calls Western Coalfield and 23.2% in Mississippian Plateau. USGS gives the first a radon index of 9 and the second 11, both in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Western Coalfield | Limestones, shale, siltstone, and coal beds. | Moderate | 9 | 76.8% |
| Mississippian Plateau | Mississippian marine limestones, dolomites, marine sandstones, siltstones, and shales. | Moderate | 11 | 23.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Butler County beside the ground around it
Across Kentucky 18.2% of the land is rated high; none of Butler County's is. Of the 6 counties that border it, 1 has more high-potential ground, Warren County the most at 0.1%.
The map rates the ground, not the air in any home.
Local help
Butler County, Local resources
Radon testing and mitigation in Butler County
- Kentucky's radon programKentucky Board of Radon SafetyKentucky's radon program answers questions about testing, mitigation and the rules in Kentucky.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Kentucky8 professionals are listed in Kentucky.
What Kentucky's program says
- Phone
- 502-782-2782
- Radon@ky.gov
What it means
Butler County, Questions
Questions about radon in Butler County
Are radon levels high in Butler County?
Over the 2008 to 2017 laboratory totals, 3.8% of the radon tests reported to CDC for Butler County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.5 pCi/L. Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Warren County reported the largest share at or above 4 pCi/L, 61.5%, and Edmonson County the smallest, 21.0%, with Logan County at 31.6% and Grayson County at 27.8% between.
Which counties border Butler County?
Butler County borders 6 counties: Ohio County, Warren County, Edmonson County, Grayson County, Logan County and Muhlenberg County.
Products
Butler County, Products
Testing a home in Butler County
No CDC figure names Butler County; the nearest county with one, Warren County (20 miles away), reported 61.5% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Butler County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
MonitorAEGTEST
HOUND-3699 radon monitor with a 2.1-inch touchscreen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
First reading: Within 1 hour
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Butler County, Bordering counties
Counties bordering Butler County
Calculated by Radon411- Radon levels in Warren CountyEPA zone 1
61.5%at or above 4 pCi/L
Median 6.3 pCi/L · 1,624 tests
- Radon levels in Logan CountyEPA zone 2
31.6%at or above 4 pCi/L
Median 2.4 pCi/L · 79 tests
- Radon levels in Grayson CountyEPA zone 2
27.8%at or above 4 pCi/L
Median 2.2 pCi/L · 36 tests
- Radon levels in Edmonson CountyEPA zone 2
21.0%at or above 4 pCi/L
Median 1.6 pCi/L · 62 tests
- Radon levels in Muhlenberg CountyEPA zone 2
17.6%at or above 4 pCi/L
Median 2.3 pCi/L · 17 tests
- Radon levels in Ohio CountyEPA zone 2
11.8%at or above 4 pCi/L
Median 1.9 pCi/L · 17 tests
Butler County, Cities and towns
Cities and towns in Butler County
The Census Bureau estimates 12,520 residents in Butler County for July 1, 2025, 199 more than in 2020 (+1.6%). That works out to 29 people per square mile of land. Its largest town, Morgantown, has 2,512 residents, 20.1% of the total. Together its 3 incorporated places hold 21.6% of those residents; the other 78.4% live outside any of them. Reported testing is thin here: 26 tests over 2008 to 2017, or 2.1 for every 1,000 residents (2025 estimate), where Kentucky as a whole comes to 6.3.
From Morgantown to Woodbury, CDC publishes no figure by town: each reads Butler County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Morgantown | 2,512 | +0.6% | 20.1% |
| Rochester | 113 | +1.8% | 0.9% |
| Woodbury | 75 | Level | 0.6% |
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).
Butler County, Homes
Homes in Butler County
Of Butler County's 5,453 homes, 65% are detached houses, against 68% across Kentucky; 27% are mobile homes. Half of its homes were built before 1986, close to Kentucky's 1982: 15% date from before 1960 and 25% from 2000 or later. 73% 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 | Butler County | Kentucky |
|---|---|---|
| Housing units | 5,453 | 2,010,655 |
| Detached houses | 65% | 68% |
| In buildings of 5 or more | 5% | 12% |
| Mobile homes | 27% | 11% |
| Built before 1960 | 15% | 22% |
| Built since 2000 | 25% | 24% |
| Middle year built | 1986 | 1982 |
| Owner-occupied | 73% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.