Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Green County, Kentucky
EPA puts Green County in Zone 1, its highest radon zone, and 32.3% of its 31 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
Share at 4+ pCi/L
32.3%
11.4 pts below KY
- Green
- 32.3%
- Kentucky
- 43.7%
31 tests, 2008 to 2017
Median result
2.5pCi/L
Below action level
- Green
- 2.5 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
31
69th of 69 by tests
- Green
- 31
- Jefferson
- 6,590
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Kentucky
41 of 69
Middle half
- Green
- 32.3%
- Meade
- 68.4%
By share, of 69 with 30+ tests
Read a result for Green County
Starts at Green County's median, 2.5 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.5 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Green County's median reported result, 2008 to 2017.
The data
Green County, At a glance
Green County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Green County in
USGS geologic potential: High across 67% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Green County, 2008 to 2017, laboratory
Under 2 pCi/L: 42%2 to 4 pCi/L: 26%4 pCi/L and above: 32%
Of 31 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 13 | 41.9% |
| 2 to 4 pCi/L | 8 | 25.8% |
| 4 pCi/L and above | 10 | 32.3% |
What these figures count
These are the 31 tests reported to CDC for Green 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).
Green County, Compared
Green County radon figures, compared
Calculated by Radon411In Green County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (10 of 31) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 3.4 points lower. Across 120 Kentucky counties pooled together, 43.7% of tests reached that level, so Green County runs 11.4 points below its state.
Of 5 neighbours with a figure, all 5 reported a larger share at or above 4 pCi/L; the spread is 43.4% (Adair County) to 65.5% (Hart County). By share, Green County is 41st of 69 Kentucky counties with 30 or more tests for the same period.
Half the tests came in under 2.5 pCi/L and half over it; the single highest reached 27.9 pCi/L. Below the action level, 13 tests (41.9%) came in under 2 pCi/L, against 33.2% statewide, and 8 tests (25.8%) fell between 2 and 4, against 23.1% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 32.3% share point the same way here. USGS geology rates 67% of the county's land high radon potential.
CDC's ten-year totals for Green County went from 39 tests (2005 to 2014) to 31 (2008 to 2017), the share going from 41.0% to 32.3%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Green County, Geology
The ground under Green County
PredictedUSGS's geologic map splits Green County: 66.5% of its land is high radon potential and 33.4% moderate. The map puts 66.5% of Green County in the area it calls Eastern Pennyroyal and 33.4% in Mississippian Plateau. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Eastern Pennyroyal | Marine shale, sandstone and limestone. | High | 12 | 66.5% |
| Mississippian Plateau | Mississippian marine limestones, dolomites, marine sandstones, siltstones, and shales. | Moderate | 11 | 33.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Green County beside the ground around it
Green County has more high-potential ground than Kentucky as a whole: 66.5% of its land against 18.2%. Of the 5 counties that border it, 3 have more high-potential ground, Adair County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Green County, Local resources
Radon testing and mitigation in Green 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
Green County, Questions
Questions about radon in Green County
Are radon levels high in Green County?
Over the 2008 to 2017 laboratory totals, 32.3% of the radon tests reported to CDC for Green County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.5 pCi/L. Of 69 Kentucky counties with 30 or more tests for the same period, 40 reported a higher share; pooled, the state comes to 43.7%.
Which counties border Green County?
Green County borders 5 counties: Taylor County, Adair County, Hart County, Metcalfe County and Larue County.
Products
Green County, Products
Testing a home in Green County
In Green County, 32.3% of 31 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 Green 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
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
Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Green County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Green County
Explore
Green County, Bordering counties
Counties bordering Green County
Calculated by Radon411- Radon levels in Hart CountyEPA zone 1
65.5%at or above 4 pCi/L
Median 8.0 pCi/L · 84 tests · 33.2 points above Green County
- Radon levels in Taylor CountyEPA zone 1
57.1%at or above 4 pCi/L
Median 4.4 pCi/L · 91 tests · 24.8 points above Green County
- Radon levels in Larue CountyEPA zone 2
47.1%at or above 4 pCi/L
Median 3.7 pCi/L · 34 tests · 14.8 points above Green County
- Radon levels in Metcalfe CountyEPA zone 1
45.5%at or above 4 pCi/L
Median 3.5 pCi/L · 33 tests · 13.2 points above Green County
- Radon levels in Adair CountyEPA zone 1
43.4%at or above 4 pCi/L
Median 3.8 pCi/L · 53 tests · 11.1 points above Green County
Green County, Cities and towns
Cities and towns in Green County
The Census Bureau estimates 11,644 residents in Green County for July 1, 2025, 515 more than in 2020 (+4.6%). That works out to 41 people per square mile of land. Greensburg, its one incorporated place, has 2,248 residents, 19.3% of the total. Reported testing is thin here: 31 tests over 2008 to 2017, or 2.7 for every 1,000 residents (2025 estimate), where Kentucky as a whole comes to 6.3.
Greensburg is the one incorporated place here; CDC publishes no figure by town, so it reads Green County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Greensburg | 2,248 | +3.3% | 19.3% |
One incorporated place, 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).
Green County, Homes
Homes in Green County
Green County is a place of houses on their own lots: 77% of its 5,292 homes are detached single-family houses, against 68% across Kentucky. Half of its homes were built before 1977, close to Kentucky's 1982: 29% date from before 1960 and 17% from 2000 or later. Owners live in 77% of the occupied homes (Kentucky: 68%), so for most households a test and a fix are their own to order.
| Homes | Green County | Kentucky |
|---|---|---|
| Housing units | 5,292 | 2,010,655 |
| Detached houses | 77% | 68% |
| In buildings of 5 or more | 3% | 12% |
| Mobile homes | 18% | 11% |
| Built before 1960 | 29% | 22% |
| Built since 2000 | 17% | 24% |
| Middle year built | 1977 | 1982 |
| Owner-occupied | 77% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.