What to Do If Your Bowling Green Home Fails a Radon Test

You tested your home. The number came back above 4.0 pCi/L. Maybe well above — in Warren County, readings in the teens are not unusual. Now you’re staring at a result you don’t fully understand, wondering how worried to be and what it’s going to cost.

Here’s the short version: this is a common, solvable problem, you are not in immediate danger, and the fix is a one-day job with a known price range. The longer version is below, in the order the questions usually come.

First, understand what the number means

Radon is measured in picocuries per liter — pCi/L. The EPA’s action level is 4.0 pCi/L, meaning at or above that number, the EPA recommends fixing the home. That threshold isn’t a cliff where danger suddenly begins; it’s the point where the agency judged the risk high enough and the fix cheap enough to recommend action.

A few reference points to place your result:

Below 2.0 pCi/L — roughly the average indoor level nationally. No action recommended.
2.0 to 3.9 pCi/L — below the action level, but the EPA notes there is no truly “safe” amount of radon and suggests considering mitigation. The World Health Organization uses a lower threshold than the EPA.
4.0 to 10 pCi/L — above the action level. Mitigation recommended.
Above 10 pCi/L — well above the action level, and common in this part of Kentucky. Mitigation strongly recommended, and worth doing promptly.
Above 20 pCi/L — high enough that most professionals would treat it as a priority rather than a project for next spring.

Warren County’s average indoor reading is around 14.0 pCi/L — among the highest county averages in Kentucky, and more than three times the action level. If your test came back high here, you are firmly in the majority, not the unlucky exception.

Second, don’t panic — but don’t file it away either

Radon risk is cumulative. It’s about exposure over years, not hours. Nobody has ever needed to evacuate a house over a radon reading, and you don’t need to make decisions tonight.

What you shouldn’t do is let it drift. The reason radon matters is that long-term exposure is the second-leading cause of lung cancer in the United States, and the leading cause among people who have never smoked — the EPA attributes roughly 21,000 deaths a year to it. That risk accrues quietly, over the decade or two you live in the house. The gap between “I’ll deal with it eventually” and “I dealt with it” is the whole ballgame.

Third, confirm the result — sometimes

Whether you should retest depends on how you tested.

If you used a mail-in charcoal kit, the result is a reasonable screening but not a precision instrument. Kits can be affected by humidity, placement, and shipping delays. A professional short-term test with a continuous monitor gives you an hourly picture and a certified report.

If a professional ran a continuous monitor for 48 hours under closed-building conditions, your number is solid. No need to retest before acting.

If you’re mid-real-estate-transaction, the test that matters is the professional one, and the clock is your constraint — see our real estate radon testing page for how that timeline usually works.

One thing that does not invalidate a high result: your neighbor testing low. Radon entry depends on the specific cracks, voids, and pressure differences beneath your particular foundation. Over karst geology like Bowling Green’s, two houses on the same street routinely return very different numbers.

Fourth, understand what the fix actually is

Radon mitigation is not a remodel. The standard fix — active sub-slab depressurization — is a length of sealed PVC pipe, a suction point beneath your foundation, and a quiet inline fan that runs continuously and vents the gas above your roofline before it can enter the house.

What that looks like in practice:

One day. Most residential installations are completed start to finish in a single day.
$800 to $2,500 installed for most Kentucky homes, with a straightforward single-suction-point system on an accessible basement landing near the lower-middle of that range. Crawl spaces, combination foundations, and homes needing multiple suction points cost more.
A few dollars a month to run the fan, which is the only moving part.
A verification test afterward, in writing, confirming your levels are below 4.0 pCi/L. A system that runs is not the goal; a verified number is.

The details of how systems are designed for different foundation types are on our radon mitigation systems page.

Fifth, if you’re buying or selling, know your options

A high radon result during a transaction is a negotiation item, not a dealbreaker. It gets handled the same way as any other inspection finding: a seller credit, a pre-closing installation, or a price adjustment. Kentucky’s seller disclosure form asks directly whether the home has been tested and what the results were, so this is a question that surfaces sooner or later in most sales.

For sellers, there’s a quiet advantage in fixing it: an installed, verified system converts an awkward disclosure line into a documented improvement, and it removes the one variable most likely to slow your closing.

What to do this week

Locate your test result and note the number and the testing method.
If it came from a mail-in kit and the number is borderline (4 to 6 pCi/L), consider a professional confirmation test.
If the number is clearly high — say, 8 pCi/L or above — skip the retest and get quotes for mitigation.
Get the quote in writing, itemized, including the post-installation verification test.
If you’re under contract, move now. Inspection windows are measured in days.

A high radon test is one of the more fixable problems a house can hand you. It has a known cause, a known solution, a predictable price, and a verifiable result — which is more than can be said for most things that turn up in a home inspection.

Questions about your test result? Call (859) 327-0684 and we’ll walk through what your number means and what it would take to bring it down.

📞 Call (859) 327-0684