Kentucky Radon Questions, Answered
The questions we get asked most often in Bowling Green. If yours is not here, call (270) 606-7712.
Is radon really that bad in Bowling Green?
Yes — this is one of the honest high-risk regions. The EPA puts Warren County in Zone 1, its highest radon-potential category; Kentucky's indoor average runs several times the U.S. average; and state studies have found elevated levels in more than a third of tested homes. The karst limestone under the county — the same rock that made Mammoth Cave and Lost River Cave — gives soil gas easy paths into basements. None of which says your house is high: it says your house is worth testing.
My neighbor's house tested fine. Doesn't that mean mine will too?
Unfortunately not — and karst is why. The fractured limestone moves soil gas unpredictably, so two similar houses a street apart routinely test wildly differently. Radon here is decided by the cracks under your specific foundation, not by the neighborhood. The only number that means anything is the one measured inside your own house.
What radon level is dangerous, and what do the numbers mean?
Radon is measured in picocuries per liter (pCi/L). The U.S. indoor average is about 1.3; the EPA action level is 4.0, above which mitigation is recommended; between 2.0 and 4.0 the EPA suggests considering it. Warren County tests come back above 4.0 constantly — and occasionally far above. The EPA attributes about 21,000 U.S. lung cancer deaths a year to radon, which is why the fix exists and why it's worth taking seriously without panicking: elevated homes are fixed here every week.
Who is allowed to do radon work in Kentucky?
Kentucky law requires anyone performing radon measurement or mitigation professionally to be certified and registered with the Kentucky Board of Radon Safety. That is a real consumer protection in a high-radon state — and every professional this site connects you with carries that state certification. If you're ever quoted by someone who can't show it, walk away.
What does radon mitigation cost here?
Most Warren County homes land between $900 and $2,500 installed for a full active system — basement sump-pit systems at the friendlier end, complex foundations and crawl space membrane work ($1,500–$3,500) at the other. Testing runs $125–$225. Fan replacement on an existing system: $300–$600. Every quote is written, and every system ends with a verification test.
We're buying a house and the radon test came back high. Should we walk away?
Almost never — this is the most fixable 'bad inspection result' in real estate. A high number converts into a concrete repair quote (usually $900–$2,500) that buyers and sellers negotiate like any other repair, and systems are routinely installed before closing. In cave country, a mitigated home with a passing verification number is arguably better understood than a never-tested one.
When is the best time to test?
Winter, if you can choose — closed windows and running furnaces concentrate radon, so a cold-season test shows the honest worst case your family breathes half the year. (January is National Radon Action Month for exactly this reason.) Real-estate tests happen whenever the contract says, and the 48-hour closed-house protocol keeps them valid year-round.
I have a radon system already. How do I know it still works?
Look at the manometer — the small U-shaped gauge on the pipe. Fluid at two different heights means the fan is pulling; level fluid means it isn't (check the breaker and switch first, then suspect the fan — most last 5 to 10 years). And gauge or no gauge, the EPA recommends retesting the air every two years; the gauge proves suction, only a test proves safety.