Carroll County, KY radon potential

Carroll 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. Carroll County sits at the 40th percentile nationally for radon potential — above 40 of every 100 rated counties.

Carroll County by the numbers

Carroll County, Kentucky is home to about 11,111 people across 128.7 square miles. That works out to roughly 86 people per square mile. Within its own EPA zone, Carroll County is bigger by population than 23% of the counties that share it. EPA's geology-based Region 4 groups Carroll County with 735 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

EPA's Zone 2 rating for Carroll County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A county-wide moderate average, like Carroll County's, can still hide a specific house well above or below it — testing is what actually answers the question.

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

Where Carroll County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Carroll County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.