Florence sits in Boone County near the Ohio River, Henderson sits along the Ohio further west, and Bowling Green anchors Warren County in south-central Kentucky. Three very different parts of the state — but homeowners in all three keep asking the same handful of questions once a radon test comes back elevated. Here's what's verifiable, and what actually happens next.
Does Florence, Kentucky have a radon problem?
Yes. Florence, in Boone County, falls within the Northern Kentucky counties the EPA classifies as having elevated radon potential in its Map of Radon Zones. That designation means predicted indoor screening levels above the EPA action level of 4 picocuries per liter (pCi/L) are more common in this region than the national average — not that every home is affected.
Zone classification is a planning tool, not a home-specific result. Two houses on the same Florence street can test differently depending on foundation type, sump design, and how much of the home sits below grade. For a deeper breakdown of what the zone designation means for Boone, Kenton, and Campbell County homeowners, see our guide on the Northern Kentucky EPA radon zone.
Why does Henderson, Kentucky see elevated radon readings?
Henderson County homes can have elevated radon regardless of broader regional trends, because radon enters through soil gas beneath a foundation and depends on site-specific conditions — soil permeability, foundation cracks, sump pit design, and even how tightly a home is sealed — not just which part of the state it's in.
That's why a Henderson North End home built on a crawlspace can test very differently from a slab-on-grade home a few blocks away in Henderson East End. County-level radon data, including how Henderson County compares statewide, is covered in our article on Kentucky counties with the highest radon. The only way to know a specific home's number is a test performed inside that home.
What does a radon mitigation system look like for a home in Bowling Green, KY?
Most Kentucky radon mitigation systems use active soil depressurization (ASD): a suction point is cut through the slab or into the sub-membrane below a crawlspace, a sealed PVC pipe runs from that point up through the house or along an exterior wall, and an in-line fan continuously pulls soil gas out and vents it above the roofline before it can enter living space.
Per EPA's Consumer's Guide to Radon Reduction, the vent pipe must discharge above the roof edge and stay well clear of windows, doors, and other openings so exhausted soil gas can't re-enter the home or drift toward a neighbor's. A small U-tube manometer is typically mounted on the pipe so the homeowner can visually confirm the fan is still running — that gauge should be checked periodically, similar to a smoke detector battery.
What about homes with crawlspaces in Warren County?
Homes without a poured basement slab — common in parts of Bowling Green and the surrounding Barren River area — often use a sub-membrane depressurization approach instead: a heavy plastic vapor barrier is sealed over the crawlspace floor and a suction point draws soil gas from beneath that membrane rather than through concrete. The installation detail should be specified in writing before work begins, whichever method the site requires.
How do I verify a radon mitigation contractor is certified in Kentucky?
Kentucky's radon program, run through the Kentucky Department for Public Health's Radon Program, tracks measurement and mitigation professionals who hold national certification through NRPP (National Radon Proficiency Program) or NRSB (National Radon Safety Board). Before hiring, ask for that certification number directly and confirm it's current — don't rely on a company's own website claim.
- Ask for the individual technician's NRPP or NRSB ID, not just a company name.
- Confirm the certification covers mitigation, since testing and mitigation are separate credentials.
- Get the post-mitigation retest commitment in writing before the fan is installed.
Steps for verifying a testing-specific credential (as opposed to mitigation) are covered in our guide to certified radon testing near me in Kentucky.
What should I expect after a radon mitigation system is installed in a Kentucky home?
EPA guidance calls for a follow-up radon test no sooner than 24 hours and no later than 30 days after system activation, using closed-house conditions similar to the original test. This confirms the system actually pulled the reading below 4 pCi/L rather than assuming it worked because the fan is audible.
Seasonal timing matters here too: radon tests are most reliable when windows and doors have been kept closed for at least 12 hours beforehand, which is naturally easier to maintain during Kentucky's colder months than during a Bowling Green or Florence summer when windows tend to stay open. If a retest is scheduled for late spring or summer, ask the operator how they're controlling for that before trusting the number.
This article is general education, not a legal, medical, or engineering opinion for any specific property. Kentucky Radon Experts is an advertising and referral service; all testing and mitigation work referenced here is performed by independent, licensed operators in our network, not by this website. Confirm current certification status, permit requirements, and local code details directly with the assigned operator before work begins.