Fayette County, PA radon potential

EPA places Fayette 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, Fayette County ranks higher in radon potential than 61% of rated counties (the 61st percentile).

Where Fayette County sits nationally

Fayette County, Pennsylvania is home to about 123,941 people across 790.758 square miles. That works out to roughly 157 people per square mile. Within its own EPA zone, Fayette County is bigger by population than 84% of the counties that share it. Fayette County falls in EPA Radon Region 3, one of 245 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Fayette County's Zone 2 prediction lands in the gap between the two. Nothing about a Zone 2 label lowers the case for testing in Fayette County — EPA recommends it in every zone, moderate included.

If Fayette County tests above the action level

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

Where Fayette County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Fayette County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.