What EPA's radon map says about Franklin County

EPA's own radon map rates Franklin County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Franklin County sits at the 11th percentile nationally for radon potential — above 11 of every 100 rated counties.

How Franklin County compares

About 17,586 people live in Franklin County, Arkansas, spread over 608.967 square miles. That works out to roughly 29 people per square mile. Among counties sharing Franklin County's EPA zone, it outranks 35% of them by population. Franklin County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Franklin County's Zone 3 prediction is the low end of the scale. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Franklin County testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Franklin County

Mitigation cost doesn't depend on Franklin 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 Arkansas's state radon program

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

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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.