What EPA's radon map says about Henderson County

EPA places Henderson 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. Henderson County sits at the 54th percentile nationally for radon potential — above 54 of every 100 rated counties.

How Henderson County compares

About 44,175 people live in Henderson County, Kentucky, spread over 436.361 square miles. Population density there runs about 101 people per square mile. Among counties sharing Henderson County's EPA zone, it outranks 64% of them by population. EPA's geology-based Region 4 groups Henderson County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

EPA's Zone 2 rating for Henderson 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 Henderson County address — a moderate county average still leaves individual homes to test either side of it.

Next steps for a home in Henderson County

Mitigation cost doesn't depend on Henderson 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

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

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Henderson County carries, the zone explainer covers what it does and doesn't tell you about any one house.