Northeast Ohio Radon Levels by County (Ohio Department of Health Data)

How common are high radon levels in Northeast Ohio? We pulled the Ohio Department of Health radon test data (county dashboard export, analytics.das.ohio.gov) for the eight counties where we do most of our work. In every one of them, a meaningful share of tested homes came in at or above the EPA action level of 4 pCi/L, from about 1 in 7 tests in Cuyahoga County to roughly 2 in 5 in Wayne and Stark counties.

What radon is, and the 4 pCi/L action level

Radon is a radioactive gas that forms naturally as uranium in soil and rock breaks down. You can’t see, smell or taste it. It seeps into homes through foundation cracks, sump pits, floor drains and gaps around pipes, and it tends to build up in basements and lower levels. The U.S. EPA identifies radon as the leading cause of lung cancer among non-smokers and recommends fixing a home when the level is 4 picocuries per liter (pCi/L) or higher. For a deeper overview, see our radon guide.

Radon test results by county

The table below shows the share of tests at or above 4 pCi/L, the number of tests reported, and the average result where the state data includes one. The last column is separate: it is the number of radon tests North Ohio Property Inspection has run in each county.

Columns 2–4: Ohio Department of Health radon test data. Averages are shown only where the state data provides them. Column 5: North Ohio Property Inspection’s own Spectora job records (aggregate counts, as of Nov 1, 2026); these are tests we ran, not part of the state data.

Percent of tests at or above 4 pCi/L, Ohio Department of Health radon test data.

What the county numbers mean

Wayne (41.1%) and Stark (39.7%) counties top this list, and they’re also the only two of these eight counties whose reported average is above 4 pCi/L (6.37 and 4.98). Medina, Lorain, Summit and Portage all fall between 27% and 30%. Lake (18.5%) and Cuyahoga (15.4%) are lower, but roughly one in six or seven tests there still reached the action level.

Also keep in mind that the state data reflects homes that chose to test, so it isn’t a random sample of every house in a county.

Local pages: Canton · Akron · Cuyahoga Falls · Medina · Parma · Lakewood · Mentor

How radon testing works during a home inspection

For a home purchase, radon testing is usually done alongside the home inspection. A typical real estate test uses a continuous radon monitor placed in the lowest livable level of the home and left running for at least 48 hours. During the test, the house should be kept under closed-house conditions: windows and exterior doors closed except for normal coming and going. The monitor records readings over the test period, and the report gives the average radon level so you can compare it with the 4 pCi/L action level.

If a home tests at or above 4 pCi/L, the EPA recommends mitigation, most often a sub-slab depressurization system with a fan that vents radon from beneath the foundation to the outside. Buyers commonly use a high result in negotiations.

North Ohio Property Inspection has run 1,560+ radon tests for clients across Northeast Ohio, most of them in Cuyahoga, Medina and Summit counties.

What a radon test costs

A radon test typically runs $149–$235, and it’s lower when added to a home inspection. Call or text 216-343-7151 for an exact quote.

Radon FAQ