What EPA's radon map says about Scioto County

EPA places Scioto County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Scioto County ranks higher in radon potential than 58% of rated counties (the 58th percentile).

Where Scioto County sits nationally

About 71,798 people live in Scioto County, Ohio, spread over 610.155 square miles. That works out to roughly 118 people per square mile. Among counties sharing Scioto County's EPA zone, it outranks 75% of them by population. Geologically, Scioto County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Zone vs. an actual test

Scioto County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. Nothing about a Zone 2 label lowers the case for testing in Scioto County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Scioto County

Mitigation cost doesn't depend on Scioto 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 Ohio's state radon program

Scioto County's test kit answers today; a Airthings radon monitor keeps answering for Scioto County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 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. Whatever zone Scioto County carries, the zone explainer covers what it does and doesn't tell you about any one house.