What EPA's radon map says about Ohio County

Ohio County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Ohio County sits at the 37th percentile nationally for radon potential — above 37 of every 100 rated counties.

Ohio County by the numbers

About 5,996 people live in Ohio County, Indiana, spread over 86.15 square miles. Averaged across its land area, Ohio County runs about 70 people per square mile. Among counties sharing Ohio County's EPA zone, it outranks 11% of them by population. Ohio County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

EPA's Zone 2 rating for Ohio County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Ohio County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Testing and mitigation in Ohio County

Mitigation cost doesn't depend on Ohio County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Indiana's state radon program

Ohio County's test kit answers today; a Airthings radon monitor keeps answering for Ohio County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.