Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Oldham County, Kentucky
EPA puts Oldham County in Zone 2, its middle radon zone, and 37.1% of its 803 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
37.1%
6.6 pts below KY
- Oldham
- 37.1%
- Kentucky
- 43.7%
803 tests, 2008 to 2017
Median result
2.7pCi/L
Below action level
- Oldham
- 2.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
803
8th of 69 by tests
- Oldham
- 803
- Jefferson
- 6,590
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Kentucky
33 of 69
Middle half
- Oldham
- 37.1%
- Meade
- 68.4%
By share, of 69 with 30+ tests
Read a result for Oldham County
Starts at Oldham County's median, 2.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.7 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. Oldham County's median reported result, 2008 to 2017.
The data
Oldham County, At a glance
Oldham County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Oldham County is a
USGS geologic potential: High across 52% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Oldham County, 2008 to 2017, laboratory
Under 2 pCi/L: 41%2 to 4 pCi/L: 22%4 pCi/L and above: 37%
Of 803 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 332 | 41.3% |
| 2 to 4 pCi/L | 173 | 21.5% |
| 4 pCi/L and above | 298 | 37.1% |
What these figures count
These are the 803 tests reported to CDC for Oldham 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).
Oldham County, Compared
Oldham County radon figures, compared
Calculated by Radon411In Oldham County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (298 of 803) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 1.4 points higher. Across 120 Kentucky counties pooled together, 43.7% of tests reached that level, so Oldham County runs 6.6 points below its state.
Of 4 neighbours with a figure, 3 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 36.6% (Henry County) to 47.7% (Clark County, IN). By share, Oldham County is 33rd of 69 Kentucky counties with 30 or more tests for the same period.
Half the tests came in under 2.7 pCi/L and half over it; the single highest reached 117.1 pCi/L. Below the action level, 332 tests (41.3%) came in under 2 pCi/L, against 33.2% statewide, and 173 tests (21.5%) fell between 2 and 4, against 23.1% statewide.
Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 37.1% share point the same way here. USGS geology rates 52% of the county's land high radon potential. CDC also counts 42 tests taken after mitigation in Oldham County for the same period: tests in homes where a fix was already in.
CDC's ten-year totals for Oldham County went from 557 tests (2005 to 2014) to 803 (2008 to 2017), the share going from 41.8% to 37.1%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Oldham County, Geology
The ground under Oldham County
PredictedUSGS's geologic map splits Oldham County: 51.7% of its land is high radon potential and 48.3% moderate. The map puts 51.6% of Oldham County in the area it calls New Albany-Chattanooga Shale and 48.1% in Outer Bluegrass. USGS gives the first a radon index of 14, 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 |
|---|---|---|---|---|
| New Albany-Chattanooga Shale | Devonian/Mississippian Black shale. | High | 14 | 51.6% |
| Outer Bluegrass | Ordovician-Devonian limestone and shale. | Moderate | 11 | 48.1% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Oldham County beside the ground around it
Oldham County has more high-potential ground than Kentucky as a whole: 51.7% of its land against 18.2%. Of the 5 counties that border it, 1 has more high-potential ground, Jefferson County the most at 55.1%.
The map rates the ground, not the air in any home.
Local help
Oldham County, Local resources
Radon testing and mitigation in Oldham 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
Oldham County, Questions
Questions about radon in Oldham County
Are radon levels high in Oldham County?
Over the 2008 to 2017 laboratory totals, 37.1% of the radon tests reported to CDC for Oldham County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.7 pCi/L. Of 69 Kentucky counties with 30 or more tests for the same period, 32 reported a higher share; pooled, the state comes to 43.7%.
Which counties border Oldham County?
Oldham County borders 5 counties: Trimble County, KY, Jefferson County, KY, Clark County, IN, Henry County, KY and Shelby County, KY.
Products
Oldham County, Products
Testing a home in Oldham County
In Oldham County, 37.1% of 803 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 43.7% pooled across Kentucky. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Oldham 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
MonitorAEGTEST
HOUND-1085 palm-sized rechargeable radon detector
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Oldham County, Bordering counties
Counties bordering Oldham 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 · 10.6 points above Oldham County
- Radon levels in Trimble County, KYEPA zone 2
45.8%at or above 4 pCi/L
Median 3.7 pCi/L · 24 tests · 8.7 points above Oldham County
- Radon levels in Jefferson County, KYEPA zone 1
39.4%at or above 4 pCi/L
Median 2.7 pCi/L · 6,590 tests · 2.3 points above Oldham County
- Radon levels in Shelby County, KYEPA zone 2
37.6%at or above 4 pCi/L
Median 3.0 pCi/L · 407 tests · 0.5 points above Oldham County
- Radon levels in Henry County, KYEPA zone 2
36.6%at or above 4 pCi/L
Median 3.2 pCi/L · 41 tests · 0.5 points below Oldham County
Oldham County, Cities and towns
Cities and towns in Oldham County
The Census Bureau estimates 70,986 residents in Oldham County for July 1, 2025, 3,281 more than in 2020 (+4.8%). That works out to 379 people per square mile of land. No town dominates: La Grange, the largest, has 10,669 residents, 15.0% of the total. Testing is reported here more often than across the state: CDC's 803 reported tests for 2008 to 2017 come to 11.3 for every 1,000 residents (2025 estimate), against 6.3 for Kentucky.
From La Grange to River Bluff, CDC publishes no figure by town: each reads Oldham County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| La Grange | 10,669 | +5.8% | 15.0% |
| Crestwood | 6,582 | +5.5% | 9.3% |
| Prospectextends beyond Oldham County | 4,705 | +2.4% | Counted whole |
| Pewee Valley | 1,668 | +5.2% | 2.3% |
| Orchard Grass Hills | 1,623 | +5.5% | 2.3% |
| Goshen | 935 | +5.2% | 1.3% |
| River Bluff | 458 | +5.3% | 0.6% |
7 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 Oldham County is counted whole, so it has no share.
Oldham County, Homes
Homes in Oldham County
Oldham County is a place of houses on their own lots: 88% of its 23,512 homes are detached single-family houses, against 68% across Kentucky. Much of Oldham County is recent building: 37% of its homes have gone up since 2000 and the middle year built is 1993, against 1982 for Kentucky. Owners live in 88% of the occupied homes (Kentucky: 68%), so for most households a test and a fix are their own to order.
| Homes | Oldham County | Kentucky |
|---|---|---|
| Housing units | 23,512 | 2,010,655 |
| Detached houses | 88% | 68% |
| In buildings of 5 or more | 5% | 12% |
| Mobile homes | 1% | 11% |
| Built before 1960 | 8% | 22% |
| Built since 2000 | 37% | 24% |
| Middle year built | 1993 | 1982 |
| Owner-occupied | 88% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.