Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Trimble County, Kentucky
EPA puts Trimble County in Zone 2, its middle radon zone, and only 24 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
47.7%
Clark County
- Clark
- 47.7%
- Henry
- 36.6%
4 of 5 neighbours have 30+ tests, 2008 to 2017
Nearest county
37.1%
Oldham County, 16 miles
- Oldham
- 37.1%
- Kentucky
- 43.7%
Share at 4+ pCi/L, 803 tests, 2008 to 2017
Ground above low
100.0%
5.7 pts above Kentucky
- Trimble
- 100.0%
- Kentucky
- 94.3%
Share of land USGS rates moderate or high potential
Tests reported
26
Too few for a share
- Trimble
- 26
- Needed
- 30
2007 to 2016, 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 Trimble 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
Trimble County, At a glance
Trimble County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Trimble 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 Trimble County, 2008 to 2017, laboratory
CDC holds 24 reported tests for Trimble County over the 2008 to 2017 laboratory totals, with a median of 3.7 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Trimble County beside the counties around it is how this page reads it.
What these figures count
Only 24 tests were reported to CDC for Trimble 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).
Trimble County, Compared
Trimble County radon figures, compared
Calculated by Radon411CDC's largest figure for Trimble County rests on 26 tests over the 2007 to 2016 laboratory totals, 11 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 47.6 pCi/L, with a middle value of 3.5 pCi/L.
Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Clark County, IN reported the largest share at or above 4 pCi/L, 47.7%, and Henry County the smallest, 36.6%, with Jefferson County, IN at 45.8% and Oldham County at 37.1% between. Farther out, Owen County (28 miles away) at 36.2%, Shelby County (28 miles away) at 37.6% and Jefferson County (34 miles away) at 39.4% 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 Trimble 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.
Trimble County, Geology
The ground under Trimble County
PredictedUSGS's geologic map puts all of Trimble County's mapped land in one class: moderate radon potential. 99.4% of it lies in the area the map calls Outer Bluegrass, to which USGS gives a radon index of 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Outer Bluegrass | Ordovician-Devonian limestone and shale. | Moderate | 11 | 99.4% |
| Dearborn Upland | Ordovician through Devonian limestone, dolostone, and gray shale, and pre-Wisconsinan glacial deposits. | Moderate | 10 | 0.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Trimble County beside the ground around it
Across Kentucky 18.2% of the land is rated high; none of Trimble County's is. Of the 5 counties that border it, 4 have more high-potential ground, Oldham County the most at 51.7%.
The map rates the ground, not the air in any home.
Local help
Trimble County, Local resources
Radon testing and mitigation in Trimble 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
Trimble County, Questions
Questions about radon in Trimble County
Are radon levels high in Trimble County?
Over the 2008 to 2017 laboratory totals, 45.8% of the radon tests reported to CDC for Trimble County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.7 pCi/L. Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Clark County, IN reported the largest share at or above 4 pCi/L, 47.7%, and Henry County the smallest, 36.6%, with Jefferson County, IN at 45.8% and Oldham County at 37.1% between.
Which counties border Trimble County?
Trimble County borders 5 counties: Carroll County, KY, Jefferson County, IN, Henry County, KY, Oldham County, KY and Clark County, IN.
Products
Trimble County, Products
Testing a home in Trimble County
No CDC figure names Trimble County; the nearest county with one, Oldham County (16 miles away), reported 37.1% 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 Trimble County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Monitor
Hello Radon C battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Trimble County, Bordering counties
Counties bordering Trimble County
Calculated by Radon411- Radon levels in Clark County, INEPA zone 1
47.7%at or above 4 pCi/L
Median 3.6 pCi/L · 512 tests
- Radon levels in Jefferson County, INEPA zone 2
45.8%at or above 4 pCi/L
Median 3.1 pCi/L · 72 tests
- Radon levels in Carroll County, KYEPA zone 2
38.5%at or above 4 pCi/L
Median 3.5 pCi/L · 26 tests
- Radon levels in Oldham County, KYEPA zone 2
37.1%at or above 4 pCi/L
Median 2.7 pCi/L · 803 tests
- Radon levels in Henry County, KYEPA zone 2
36.6%at or above 4 pCi/L
Median 3.2 pCi/L · 41 tests
Trimble County, Cities and towns
Cities and towns in Trimble County
The Census Bureau estimates 8,701 residents in Trimble County for July 1, 2025, 236 more than in 2020 (+2.8%). That works out to 57 people per square mile of land. No town dominates: Bedford, the largest, has 628 residents, 7.2% of the total. Together its 2 incorporated places hold 14.1% of those residents; the other 85.9% live outside any of them. Reported testing is thin here: 26 tests over 2007 to 2016, or 3.0 for every 1,000 residents (2025 estimate), where Kentucky as a whole comes to 5.7.
From Bedford to Milton, CDC publishes no figure by town: each reads Trimble County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Bedford | 628 | +0.3% | 7.2% |
| Milton | 595 | +1.4% | 6.8% |
2 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).
Trimble County, Homes
Homes in Trimble County
Of Trimble County's 3,870 homes, 68% are detached houses, against 68% across Kentucky; 29% are mobile homes. Half of its homes were built before 1988, close to Kentucky's 1982: 19% date from before 1960 and 21% from 2000 or later. Owners live in 82% of the occupied homes (Kentucky: 68%), so for most households a test and a fix are their own to order.
| Homes | Trimble County | Kentucky |
|---|---|---|
| Housing units | 3,870 | 2,010,655 |
| Detached houses | 68% | 68% |
| In buildings of 5 or more | 2% | 12% |
| Mobile homes | 29% | 11% |
| Built before 1960 | 19% | 22% |
| Built since 2000 | 21% | 24% |
| Middle year built | 1988 | 1982 |
| Owner-occupied | 82% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.