Shelby County, KY radon potential

Shelby 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. That puts Shelby County in the 55th percentile nationally for radon potential — higher than 55% of the counties EPA has rated.

How Shelby County compares

Shelby County, Kentucky is home to about 50,124 people across 379.795 square miles. That works out to roughly 132 people per square mile. Within its own EPA zone, Shelby County is bigger by population than 67% of the counties that share it. Geologically, Shelby County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Shelby County's Zone 2 prediction. Middle-of-the-pack doesn't mean risk-free for any one Shelby County address — a moderate county average still leaves individual homes to test either side of it.

Testing and mitigation in Shelby 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 Shelby County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Shelby 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 Shelby County's figures come from

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