Radon Testing in Ohio Homes: What Buyers and Sellers Need to Know

When it comes to buying or selling a home in Ohio, one of the most important health and safety concerns is radon. At Mook Home Inspections LLC, we help homeowners and buyers understand the risks of radon, the importance of testing, and what happens if a home requires mitigation.

What is Radon?

Radon is a colorless, odorless, radioactive gas that forms naturally when uranium in soil and rock breaks down. It seeps into homes through cracks in foundations, sump pumps, crawl spaces, and other openings.

The danger with radon is long-term exposure. According to the U.S. Environmental Protection Agency (EPA), radon is the second leading cause of lung cancer in the United States after smoking.

Why Radon Testing is Important in Ohio

Ohio is considered a Zone 1 state by the EPA, meaning much of the state has higher potential for elevated radon levels. The Ohio Department of Health (ODH) reports that about 50% of Ohio homes test at or above the EPA’s action level of 4.0 pCi/L (picocuries per liter).

• For Home Buyers: Testing ensures you know the radon levels before committing to a purchase. High levels can affect your health and future resale value.

• For Home Sellers: A radon test provides transparency and avoids delays during the sales process. Homes with tested and mitigated radon systems are often more attractive to buyers.

The Radon Mitigation Process in Ohio

If testing shows radon levels at or above 4.0 pCi/L, mitigation is recommended. In Ohio, mitigation should be performed by a licensed radon mitigation professional certified through the Ohio Department of Health.

A typical mitigation system includes:

• Sub-slab Depressurization: The most common method, which involves installing PVC piping and a fan system to pull radon from beneath the foundation and vent it safely above the roofline.

• Sealing Entry Points: Cracks and openings in the foundation are sealed to limit radon entry.

• System Monitoring: Most systems include a warning device to show the fan is working properly.

Once installed, the system can reduce radon levels by up to 99%, bringing the concentration well below the EPA action level.

When is Mitigation Required?

According to the Ohio Department of Health and EPA guidelines:

• At or above 4.0 pCi/L: Mitigation is recommended.

• Between 2.0 and 4.0 pCi/L: Consider mitigation, especially if the home has long-term occupants, children, or smokers.

• Below 2.0 pCi/L: No mitigation is required, but retesting is encouraged every 2–5 years or after major renovations.

Protecting Your Family and Your Investment

Radon testing is a simple, affordable step that can protect your family’s health and safeguard your real estate investment. In a state like Ohio—where high radon levels are common—it’s especially important for both buyers and sellers to make testing a priority.

At Mook Home Inspections LLC, we offer radon testing as part of our comprehensive home inspection services. If elevated levels are found, we’ll guide you on the next steps, including licensed mitigation options.

Have Mook Take a Look—and breathe easier knowing your home is safe.