Perry County, PA radon potential

EPA places Perry County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 89th percentile for radon potential — Perry County outranks 89% of every county EPA has rated.

How Perry County compares

Perry County, Pennsylvania is home to about 46,816 people across 551.45 square miles. Averaged across its land area, Perry County runs about 85 people per square mile. Within its own EPA zone, Perry County is bigger by population than 69% of the counties that share it. EPA's geology-based Region 3 groups Perry County with 244 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Perry County

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Perry County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Perry County will test well under the action level, and EPA's guidance is to test regardless of zone.

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 Pennsylvania'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

Perry County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.