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Radon Levels in Oldham County, Kentucky

Zone 2Moderate predicted potential195 square miles · 5 bordering counties

What this means for you

  • Your area: EPA rates Oldham County Zone 2, the middle of its three radon zones. That is a prediction for the whole county, and homes with elevated levels occur in all three zones.
  • Local tests: Of 803 radon tests reported to CDC for Oldham County (2008 to 2017), 37.1% were at or above 4 pCi/L, EPA's action level.
  • Your home: The only way to know your home’s level is to test it.

pCi/L (picocuries per liter) is the unit radon is measured in. EPA recommends fixing a home at 4 pCi/L or above, its action level.

Over the 2008 to 2017 laboratory totals, 37.1% of the radon tests reported to CDC for Oldham County, Kentucky came back at or above the EPA action level of 4 pCi/L, and the median result was 2.7 pCi/L. EPA's Map of Radon Zones places the county in Zone 2, moderate predicted potential. Radon levels vary from home to home, so only a test measures the level in yours.

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

EPA predicts an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³) across the county as a whole.

This is a county-level geologic prediction. It is not a measurement of any address, and houses with elevated radon are found in all three zones.

USGS geologic potential: Low across 51% of the county's land area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Oldham County, 2008 to 2017, laboratory

Tests reported
803
At or above 4 pCi/L
37.1%
Median result
2.7 pCi/L
Reported results by concentration band, 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. CDC publishes the share in each band, not a count per band, so the per-band counts in the table are calculated by Radon411 and rounded to add up to the published total.

Reported results by concentration band, Oldham County, 2008 to 2017, laboratory: data table
Result bandTests Calculated by Radon411Share Measured
Under 2 pCi/L33241.3%
2 to 4 pCi/L17321.5%
4 pCi/L and above29837.1%

Distribution of tested buildings, not this house. People testing before a sale, or because they suspect a problem, are over-represented in any reported testing data.

Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

Oldham County, In figures

Oldham County in figures

What the published data says about Oldham County, in words. A zone and a share of tests describe an area, never the level in any one home.

    • Predicted

      Predicted

      EPA places Oldham County in Zone 2, moderate predicted potential, as it does 81 other counties of Kentucky's 120.

      Of the 5 bordering counties, EPA places Clark County and Jefferson County in Zone 1 and Henry County, Shelby County and Trimble County in Zone 2.

  • Reported tests

    Measured

    CDC publishes no annual figure for Oldham County; its figure is a laboratory total for 2008 to 2017: 37.1% of 803 reported tests were at or above 4 pCi/L.

  • Local record

    Kentucky's radon program and its page are under Local resources.

    The county's largest incorporated places are La Grange, Crestwood and Prospect; the figures here cover them as part of the county.

Oldham County, Comparison

How Oldham County compares

Measured

Oldham County's own published CDC figures beside those of the counties that border it, for the same period.

Share of reported tests at or above 4 pCi/L

Measured

2008 to 2017, laboratory, highest first. Each county’s own published CDC figure.

  1. Clark CountyIN512 tests47.7%
  2. Trimble CountyKY24 tests45.8%
  3. Jefferson CountyKY6,590 tests39.4%
  4. Shelby CountyKY407 tests37.6%
  5. Oldham CountyThis page803 tests37.1%
  6. Henry CountyKY41 tests36.6%

Median reported result

Measured

2008 to 2017, laboratory, highest first. Each county’s own published CDC figure.

  1. Trimble CountyKY24 tests3.7 pCi/L
  2. Clark CountyIN512 tests3.6 pCi/L
  3. Henry CountyKY41 tests3.2 pCi/L
  4. Shelby CountyKY407 tests3.0 pCi/L
  5. Jefferson CountyKY6,590 tests2.7 pCi/L
  6. Oldham CountyThis page803 tests2.7 pCi/L

Each figure is that county’s own published CDC figure for 2008 to 2017, laboratory, counting radon tests reported to CDC, not homes. Oldham County is this page. Nothing is averaged or combined across counties. The test count beside each county is CDC’s published number of pre-mitigation tests behind its figures. Figures from few tests can swing widely from year to year. Every Kentucky county’s own figure is in the Kentucky county table.

CDC publishes this figure only for counties here, so there is no state or national number to compare Oldham County, Kentucky with.

Oldham County, Bordering counties

Counties bordering Oldham County

Calculated by Radon411

5 counties share a boundary with Oldham County, computed from Census county geometry. Radon potential follows geology rather than county lines, so a bordering county’s report can be worth reading alongside this one.

Oldham County, Local resources

Local resources in Kentucky

Who to ask in Kentucky: the state's radon program, test kits and professionals.

Kentucky's radon program

Kentucky Board of Radon Safety

Kentucky’s radon program answers questions about testing, mitigation and the rules where you live.

Phone
502-782-2782
Email
Radon@ky.gov
Visit the program's page(opens in a new tab)

Test kits

Ask the program whether it has free or discounted kits, or compare kits you can buy.

Radon professionals

12 professionals are listed in Kentucky.

Professionals in Kentucky

Oldham County, Cities and towns

Cities and towns in Oldham County

The radon figures on this page are for Oldham County as a whole. They do not differ by city or town.

  • La Grange
  • Crestwood
  • Prospect (part)
  • Pewee Valley
  • Orchard Grass Hills
  • Goshen
  • River Bluff

7 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county.

Oldham County, Questions

Questions about radon in Oldham County

Common questions8 questions, answered from the figures above

Are radon levels high in Oldham County?

In 2017, 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. That is a share of reported tests, not of homes. EPA places Oldham County in Zone 2, moderate predicted potential, a predicted average indoor screening level 2 to 4 pCi/L. Homes with elevated levels occur in all three zones, so the figures describe the area, not your house. Testing is the only way to know the radon level in a specific building.

What a radon level meansRadon in Kentucky

How do I get a radon test in Oldham County?

EPA says you can test your home yourself or hire a qualified radon test company, and that either approach takes only a small amount of time and effort. No certified tester listed on Radon411 names Oldham County as a service area yet. The Kentucky radon program is the place to ask about certified testers and any test kit offer it runs.

How to test a homeTest kits comparedFree and low-cost kits by stateKentucky radon program

Who does radon mitigation in Oldham County?

No listed mitigator names Oldham County as a service area yet; the Kentucky directory lists 12 companies. EPA recommends having a qualified contractor fix a home with a radon problem, because lowering high radon levels takes technical knowledge and special skills, and some states require the work to be done by a licensed or certified professional. Your state radon program is the place to check whether Kentucky requires one.

How radon mitigation worksWhat mitigation costsMitigators in Kentucky

What EPA radon zone is Oldham County in?

EPA places Oldham County, Kentucky in Zone 2, which EPA describes as moderate predicted potential for the area. A zone is a prediction for the whole county and never determines whether a particular home should be tested. EPA recommends testing every home regardless of zone.

Should I test my home in Oldham County?

Yes. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. How to test a home.

When is the best time of year to test?

EPA says short-term tests stay in the home from 2 to 90 days and that all radon tests should run a minimum of 48 hours; long-term tests stay more than 90 days. EPA's guides do not name a best season: they say radon levels tend to vary from day to day and season to season, so a long-term test is more likely than a short-term test to tell you the year-round average.

What does it cost to test?

EPA's Citizen's Guide calls testing easy and inexpensive, and EPA's Home Buyer's and Seller's Guide says passive short-term and long-term devices are generally inexpensive, while active devices may cost more. No national average price is published for this, so Radon411 does not give one. What testing costs.

Which counties border Oldham County?

Oldham County borders 5 counties, derived from Census county geometry. Radon potential follows geology rather than county lines, so a bordering county's report can be relevant.

What these figures mean if you own, buy, sell or rent

The reported-test figures on this page describe Oldham County, Kentucky in 2017. They describe tests other people carried out in other buildings, and none of them measures yours.

  • If you own your home

    Test the lowest lived-in level; a short-term kit screens in days, a long-term kit reflects the year.

    How to test a home
  • If you are buying

    Ask for past results and any system's post-mitigation test, and test during the sale.

    Buying a house: radon guide
  • If you are selling

    Testing before you list puts the timing in your hands; disclosure rules differ by state.

    Selling a house: radon guide
  • If you rent, or rent out a home

    A tenant can test; a fix is the owner's to make, and duties differ by state.

    Radon in rental homes

How long a test has to run, under what conditions, and what EPA says a result means: the testing standard, in full.

Oldham County, Products

Testing and mitigation products

Whatever the figures for Oldham County show, only a test tells you about one home.

Oldham County / Next steps

What to do next

Informational. Follow EPA guidance. EPA says all radon tests should be taken for a minimum of 48 hours, with windows and doors closed from 12 hours before a short-term test.