Radon mitigation cost in Ohio

What moves the price in Ohio

Columbus and central Ohio — where radon runs highest — see steady demand and competitive pricing. Standard sub-slab installs cluster around $1,000–$1,500; block-wall foundations (common in older Ohio housing) and multiple suction points push toward the top of the range. The fan adds roughly $70/year in electricity.

Price sources: FindRadonPros — Ohio cost; HomeAdvisor radon mitigation cost (2026). See our methodology on cost sourcing.

The law: what to demand from a Ohio quote

Ohio requires a state license for radon work, administered by the Ohio Department of Health (ODH) under Ohio Revised Code Chapter 3723. Anyone who installs mitigation systems, designs them, tests for radon, or runs a radon lab must be specifically licensed by ODH — and importantly, ODH is explicit that NRPP or NRSB certification is neither a substitute for the state license nor automatically sufficient. In other words, a contractor waving a national certification is not the same as an ODH-licensed installer, and Ohio law requires the latter. Ask any contractor for their ODH license number before you hire, and confirm it covers mitigation specifically.

Source: Ohio Dept. of Health — Radon Licensing.

Radon across Ohio’s metros

Ohio's metros vary widely. Central Ohio is the hot spot: Franklin County (Columbus) tests high in about 72% of homes, and neighboring Delaware County is right there at 72% as well — among the highest big-county rates in the nation. Cincinnati's Hamilton County runs about 35%, while Cleveland's Cuyahoga County is comparatively low at 22%. That spread — a Columbus home three times as likely to test high as a Cleveland home — is exactly why an Ohio state average misleads, and why the county number is the one that matters for your decision.

Why radon is high in Ohio

Ohio's radon is driven by glacial deposits and the underlying bedrock, especially across the central and western parts of the state where much of the terrain sits in EPA Radon Zone 1. Central Ohio — Franklin, Delaware, and the surrounding counties — consistently posts some of the highest indoor radon in the state, with well over half of tested homes above the action level in the worst counties. The glaciated till that covers much of Ohio concentrates radon-producing material near the surface, and the state's older housing stock, much of it built before radon-resistant construction, does little to keep the gas out.

Is it worth the cost?

Ohio's combination of low prices and high radon makes mitigation an easy call in the worst counties. Against the health stakes — radon is the leading cause of lung cancer among non-smokers and, by EPA's estimate, responsible for about 21,000 lung-cancer deaths a year — a ~$1,200 system is one of the cheaper meaningful home repairs available. And Ohio's real-estate market, especially in the high-radon Columbus corridor, routinely surfaces radon during inspection; a documented, licensed system with a passing re-test keeps it from becoming a closing-table problem.

Health figures: U.S. EPA, Health Risk of Radon.

What the price actually buys

A standard Ohio price buys an active sub-slab depressurization system: an attic- or exterior-mounted radon fan draws air continuously from under the basement slab through PVC and vents it above the roofline. Most homes need a single suction point; block-wall foundations may need the walls depressurized too. The price should include a manometer, sealing of slab penetrations and the sump, and a post-install re-test proving the level fell below 4 pCi/L. The fan uses about as much power as a lightbulb (~$70/year) and typically lasts 5–10 years.

Foundations & what they cost to fix

Ohio's housing runs from full basements (common and the cheapest to mitigate) to the block-wall foundations frequent in older homes, which are the priciest to handle. A hollow block-wall foundation can channel radon through the cores of the blocks, sometimes requiring block-wall depressurization rather than a simple sub-slab system — a premium specialty install that can run $1,500–$4,500. If your home has a block-wall or a mix of foundation types, expect a quote toward the upper end and make sure the installer has actually diagnosed the foundation, not just quoted a standard system.

Test before you pay for mitigation

Before you spend a dollar on a system, confirm you actually have a problem — and get a real number, not a guess. A short-term charcoal test kit (a few days in the lowest lived-in level of the home, then mailed to a lab) is the cheapest way to establish your level; a continuous monitor is handy for tracking trends but isn’t a certified measurement. In Ohio, ODH Radon Program is the place to start for low-cost or free kits and guidance. If your result comes back at or above 4 pCi/L, then the cost figures on this page are what to expect. If it’s borderline, re-test before committing — radon fluctuates, and one high reading in a storm week isn’t the same as a sustained problem. You can also check how your county tests up to gauge how likely a high reading is where you live.

Red flags in a Ohio quote

• ⚑No ODH license number — required by Ohio law, and NOT the same as an NRPP/NRSB certification.
• ⚑A contractor claiming national certification is 'good enough' — Ohio explicitly requires the state license.
• ⚑No post-install re-test included — no proof the system worked.
• ⚑A standard sub-slab quote on a block-wall foundation without diagnosing it — block walls often need a different, pricier system.
• ⚑No written guarantee that levels will drop below the action level.