What EPA's radon map says about Grant County

EPA's own radon map rates Grant County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Grant County sits at the 49th percentile nationally for radon potential — above 49 of every 100 rated counties.

Where Grant County sits nationally

About 25,722 people live in Grant County, Kentucky, spread over 257.976 square miles. Averaged across its land area, Grant County runs about 100 people per square mile. Among counties sharing Grant County's EPA zone, it outranks 47% of them by population. Grant County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Grant County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Grant County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Testing and mitigation in Grant County

Mitigation cost doesn't depend on Grant County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Kentucky's state radon program

Grant County's test kit answers today; a Airthings radon monitor keeps answering for Grant County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

Grant County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Grant County carries, the zone explainer covers what it does and doesn't tell you about any one house.