Ohio County, KY radon potential

EPA places Ohio 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. Ohio County sits at the 48th percentile nationally for radon potential — above 48 of every 100 rated counties.

Ohio County by the numbers

Ohio County, Kentucky is home to about 23,933 people across 587.096 square miles. Averaged across its land area, Ohio County runs about 41 people per square mile. Within its own EPA zone, Ohio County is bigger by population than 45% of the counties that share it. Geologically, Ohio County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

What this actually means for a house in Ohio County

Ohio County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Nothing about a Zone 2 label lowers the case for testing in Ohio County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Ohio County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Kentucky's state radon program

For Ohio County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Ohio County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Ohio County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.