Grayson County, KY radon potential

Grayson County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Grayson County sits at the 49th percentile nationally for radon potential — above 49 of every 100 rated counties.

Where Grayson County sits nationally

Grayson County, Kentucky is home to about 27,070 people across 499.536 square miles. That works out to roughly 54 people per square mile. Within its own EPA zone, Grayson County is bigger by population than 49% of the counties that share it. EPA's geology-based Region 4 groups Grayson County with 735 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

EPA's Zone 2 rating for Grayson County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Middle-of-the-pack doesn't mean risk-free for any one Grayson County address — a moderate county average still leaves individual homes to test either side of it.

Next steps for a home in Grayson 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 Grayson County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Grayson 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 Grayson County's figures come from

Grayson County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.