Radon Testing & Mitigation in Cincinnati

Yes. Greater Cincinnati falls within Ohio’s EPA Zone 1 designation — the highest risk category — and approximately 35% of homes in the area test at or above the EPA action level of 4.0 pCi/L. The region’s ancient Ordovician limestone bedrock is highly uranium-bearing, making it a prolific source of radon gas. The hilly topography also means many homes are built close to or directly on exposed bedrock, accelerating radon entry.

Absolutely. Radon enters based on geology and foundation design — not the age of a home. Many newer suburban developments in Warren and Butler counties, including Mason, West Chester, and Liberty Township, are built on soils with elevated radon potential. Ohio’s building code now requires radon-resistant construction in new homes in Zone 1 counties, but these measures reduce — they don’t eliminate — radon risk. Testing your new home is always the right step.

Homes with crawl spaces can still accumulate dangerously high radon levels, and mitigation approaches differ slightly from basement homes. For crawl spaces, we typically install a combination of sub-membrane depressurization (drawing radon from beneath the crawl space liner) and/or active ventilation, depending on your specific conditions. We assess each home individually and design the most effective solution.

Yes. Warren County — including Lebanon, Springboro, Mason, Maineville, and Waynesville — is squarely within our service area and is a particularly active area for radon testing. Warren County sits at the intersection of the Miami Valley and Cincinnati geological zones, and homes throughout the county can see elevated readings.

The Ohio River valley itself tends to see somewhat lower radon readings in the immediate floodplain, since radon disperses more readily in well-ventilated areas. However, the hillside and terrace communities above the valley — where most Cincinnati suburbs are built — sit directly on or near radon-producing limestone, and often see elevated readings. The further you get from the river into suburban hillside developments, the more important individual testing becomes.

Most residential mitigation systems in the Cincinnati area are installed in 3-5 hours for a standard basement application. Homes with crawl spaces or complex foundation layouts may require a full day. We always schedule a post-mitigation verification test to confirm your system is performing correctly and your radon levels are safely below the EPA limit.