What EPA's radon map says about Ballard County

Ballard County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally that's the 5th percentile for radon potential — Ballard County outranks 5% of every county EPA has rated.

Where Ballard County sits nationally

About 7,626 people live in Ballard County, Kentucky, spread over 247.095 square miles. Population density there runs about 31 people per square mile. Among counties sharing Ballard County's EPA zone, it outranks 14% of them by population. EPA's geology-based Region 4 groups Ballard County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

A Zone 3 county like Ballard County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Ballard County — EPA's guidance to test every home makes no exception for counties predicted low.

Testing and mitigation in Ballard County

Mitigation cost doesn't depend on Ballard 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

Ballard County's test kit answers today; a Airthings radon monitor keeps answering for Ballard 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

Ballard 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.