Perry County, IN radon potential

EPA places Perry 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. That puts Perry County in the 46th percentile nationally for radon potential — higher than 46% of the counties EPA has rated.

Perry County by the numbers

Perry County, Indiana is home to about 19,320 people across 381.74 square miles. Averaged across its land area, Perry County runs about 51 people per square mile. Within its own EPA zone, Perry County is bigger by population than 38% of the counties that share it. Perry County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Perry 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 Perry County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Perry 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 Indiana's state radon program

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

Where Perry County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Perry County's numbers. Whatever zone Perry County carries, the zone explainer covers what it does and doesn't tell you about any one house.