Where we work
Radon Mitigation Service Area — Cincinnati & Northern Kentucky
Ohio Valley Radon Mitigation connects homeowners with licensed radon contractors across 13 counties in three states — from the Cincinnati metro north through Dayton, west into Preble and Clark counties, and east into Brown County, plus Northern Kentucky and Southeast Indiana.
The nine Ohio counties and Dearborn County, Indiana sit in EPA Radon Zone 1 — the highest radon-potential category the map has, predicted above the 4.0 pCi/L action level. The three Northern Kentucky counties are Zone 2 (predicted 2–4 pCi/L), but Zone 2 does not mean safe: real-world test results across Northern Kentucky frequently exceed 4.0 pCi/L. That isn't a scare line; it comes from soil, bedrock, and years of test data along the Ohio River valley. Whether you're up in Montgomery County near Dayton or across the river in Boone County, elevated radon is common enough that every home should be tested. When yours reads high, we match you with an independently licensed contractor near you for a free quote. Here's how the matching works.
County by county
The counties we cover
Thirteen counties across three states. The nine Ohio counties and Dearborn County, Indiana are EPA Zone 1 (predicted >4 pCi/L); the three Northern Kentucky counties are Zone 2 (predicted 2–4 pCi/L), where tests still frequently exceed the 4.0 pCi/L action level. Every home should be tested.
| County | State | Radon note |
|---|---|---|
| Hamilton | Ohio | Cincinnati proper — dense pre-1940 housing stock with basements that give radon easy paths in. |
| Butler | Ohio | Fast-growing suburbs like West Chester and Fairfield; new and old foundations alike test high. |
| Warren | Ohio | Mason and Loveland sit on the glacial till that holds and releases radon into finished basements. |
| Clermont | Ohio | Rural and exurban east of the city, where well-served homes on rock still read above the action level. |
| Brown | Ohio | Rural country east of Clermont, including Georgetown — Zone 1 soils under farmhouses and newer builds alike. |
| Montgomery | Ohio | The Dayton metro — Kettering, Centerville and Miamisburg sit on glacial deposits that push radon into basements. |
| Clinton | Ohio | Wilmington and the farm country between Cincinnati and Dayton; Zone 1 potential across the county. |
| Clark | Ohio | Springfield and the northern edge of the service area, where older housing stock tests high. |
| Preble | Ohio | Eaton and the Indiana-line farm belt west of Dayton — rural Zone 1 ground throughout. |
| Boone | Kentucky | Florence and the fast-building I-71/75 corridor; fractured limestone under much of the county. |
| Kenton | Kentucky | Covington, Independence and the river bluffs — hillside foundations and old basements collect the gas. |
| Campbell | Kentucky | Newport, Alexandria and the eastern river county of Northern Kentucky — EPA Zone 2, but tests here still frequently exceed the action level. |
| Dearborn | Indiana | Lawrenceburg and Southeast Indiana just across the state line — EPA Zone 1, same elevated potential as the Ohio side. |
Find your town
Local radon pages by community
Pick your community for detail on radon in your area and to get matched with a contractor who covers it. Grouped by county across Ohio, Kentucky and Indiana.
Butler County, OH
Warren County, OH
Clermont County, OH
Brown County, OH
Montgomery County, OH
Clinton County, OH
Clark County, OH
Preble County, OH
Boone County, KY
Kenton County, KY
Campbell County, KY
Northern Kentucky
Dearborn County, IN
Two states, two rulebooks
We cover both sides of the river
Ohio and Kentucky handle radon credentials differently, and it matters for who fixes your home. Ohio requires radon contractors to hold a license through the Ohio Department of Health (ODH). Kentucky doesn't run a state license the same way, but the standard there is NRPP certification — the national credential most reputable Kentucky pros carry.
Plenty of Cincinnati providers quietly ignore the Kentucky side, treating the river like a wall. We don't. If your home is in Boone, Kenton, or Campbell County, we match you with a contractor who works there and holds the right credential for that state. See the Northern Kentucky page for how it works across the river, or read our radon mitigation overview.
Not on the list?
Don't see your town?
The pages above are the communities we get asked about most — they're not the whole map. Our contractor network reaches well beyond them across Greater Cincinnati, the Dayton area, and the tri-state region. If your town isn't listed, we very likely still cover it. Reach out with your zip code and we'll tell you straight whether we can match you, and get a licensed contractor to send a free quote. Start on our contact page or check the FAQ first.
Free, no obligation
Ready to find out your number?
Tell us your zip code and a little about your home. We'll connect you with a licensed radon contractor in your county for a free quote — no cost to you.