What EPA's radon map says about Boone County

EPA's own radon map rates Boone County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Boone County sits at the 53rd percentile nationally for radon potential — above 53 of every 100 rated counties.

Where Boone County sits nationally

About 38,636 people live in Boone County, Arkansas, spread over 589.723 square miles. Population density there runs about 66 people per square mile. Among counties sharing Boone County's EPA zone, it outranks 61% of them by population. EPA's geology-based Region 6 groups Boone County with 502 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 Boone County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Boone County — testing is the only way to know an individual home's actual level.

If Boone County tests above the action level

Mitigation cost doesn't depend on Boone 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

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

Boone County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.