Common questions
Radon Questions, Answered for Greater Cincinnati
Short, straight answers on radon for homeowners across Southwest Ohio and Northern Kentucky — what it is, when to act, how a system works, and what it costs. We're a referral service, so we'll point you to the right licensed contractor when you're ready.
The basics
Radon is a radioactive gas that forms as uranium in soil and rock breaks down. It has no color, no smell, and no taste, so it moves into a house through foundation cracks, sump pits, and slab penetrations without anyone noticing. It gathers in the lowest lived-in level, which around here usually means the basement.
Greater Cincinnati sits in EPA Radon Zone 1, the highest-potential category, and Northern Kentucky counties are largely the same. The Ohio River valley geology of glacial till and fractured limestone holds and releases a lot of radon, and a large share of the older housing stock has foundations that give the gas easy paths inside. See the county-by-county radon data for the local numbers.
The EPA identifies radon as the second-leading cause of lung cancer in the United States, behind smoking, and the leading cause among people who have never smoked. The risk builds from long-term exposure, not a single afternoon in the basement. There are no short-term symptoms that warn you, which is exactly why testing matters. You can read more on the radon exposure and symptoms page.
Testing
The EPA recommends fixing your home at or above 4.0 pCi/L. There is no level considered fully safe, so many homeowners also mitigate in the 2 to 4 range. A well-built system usually pulls a home below 2.0.
A short-term test runs from about 2 to 7 days and gives you a fast snapshot, which is why it fits real-estate timelines. A long-term test runs more than 90 days and reflects how radon shifts across seasons, so it gives a truer year-round average. If a short-term test comes back near the action level, a follow-up test confirms the number before you spend anything. More on radon testing.
A DIY kit from a hardware store is a fine, low-cost way to get a first reading of your own home. For a real-estate transaction or before paying for a mitigation system, a licensed professional test carries more weight because it follows placement and chain-of-custody rules that a loose kit does not. Use a kit to screen; use a pro to decide.
Mitigation & systems
The most common design is sub-slab depressurization. A pipe is sealed into the slab or sump, and a continuously running fan pulls radon from under the foundation and vents it above the roofline, before it can enter the living space. Once it is running, the system needs little attention beyond an occasional glance at its gauge. The radon mitigation system page walks through the parts in detail.
Most single-family installs are finished in one day, often in a few hours. Larger homes, multiple foundation types, or tricky routing for the vent pipe can push it longer. The licensed contractor confirms the timeline when they quote your specific home.
Cost
Most Greater Cincinnati homes land between $800 and $2,200 for a full system. Foundation type, the number of suction points, and how far the vent has to run drive the price. The cost guide breaks the range down piece by piece.
A radon fan typically runs about 5 to 10 years before it needs replacing, and the rest of the system, the pipe and seals, lasts far longer. Swapping a worn fan is a small job, usually a few hundred dollars, and a licensed contractor can match a replacement to your existing pipe.
Real estate
It helps. A documented system with a low post-mitigation test result answers the radon question before a buyer ever asks it, which keeps a deal moving. Buyers tend to read an installed system as a home that was taken care of, not as a red flag.
There is no fixed rule; it is negotiated. Often the seller pays for or credits the mitigation once a test during the inspection period comes back high, but buyers sometimes take it on to keep an offer competitive. Because inspection windows are short, moving fast on a quote is what keeps the option open. The real-estate radon page covers the timing.
Yes. Ohio requires anyone testing or mitigating radon for a fee to hold a license from the Ohio Department of Health, so it is mandatory. Kentucky does not mandate a state license, but national certification through the NRPP is the recognized standard and worth asking for. We match Ohio homeowners with ODH-licensed contractors on that basis.
Working with us
No. Ohio Valley Radon Mitigation is a referral service. We match you with an independently licensed, Ohio ODH-credentialed radon contractor who covers your area, and that contractor performs all testing and mitigation. We do not send crews or do the install ourselves.
Nothing. Getting matched and receiving a quote is free to you. We are paid by the contractor network, not by homeowners, so there is no fee for the referral itself.
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