Radon in Summit & Cuyahoga County: Testing and Mitigation
Last reviewed Oct 29, 2026 · Sources linked in the text
Radon is an invisible, odorless gas. The U.S. EPA calls it the second leading cause of lung cancer after smoking, and a test is the only way to know your home's level (EPA).
What the data says for our two counties
| Summit County | Cuyahoga County | |
|---|---|---|
| EPA radon zone | Zone 1 (highest predicted potential) | Zone 2 (moderate) |
| Reported lab tests at or above 4 pCi/L (CDC, 2008–2017) | 38.7% of 6,486 tests | 21.7% of 10,092 tests |
| Median reported result | 3.1 pCi/L | 2.0 pCi/L |
Figures as compiled by Radon411 from the EPA Map of Radon Zones and CDC tracking data (Summit, Cuyahoga). They describe counties and the tests people chose to report, not your home.
When to fix: 4 pCi/L
EPA recommends fixing a home when radon is 4 picocuries per liter (pCi/L) or higher, and suggests considering a fix between 2 and 4 pCi/L (EPA Citizen's Guide).
Ohio requires a license
- The Ohio Department of Health (ODH) licenses radon testers, mitigation specialists and mitigation contractors (ODH). Contractor licenses start with RC, specialists with RS, testers with RT.
- ODH's "Hire a Professional" page points to its Radon Licensure map to find licensed testers and mitigation contractors (ODH).
- If the same company tests and then mitigates your home, Ohio rules require the written contract to say so and to explain the value of long-term testing and a second opinion (OAC 3701-69-05).
Questions? ODH radon staff: 614-728-0272, indoor.radon@odh.ohio.gov (ODH).