What EPA's radon map says about Montgomery County

Montgomery County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. That puts Montgomery County in the 39th percentile nationally for radon potential — higher than 39% of the counties EPA has rated.

Montgomery County by the numbers

About 8,510 people live in Montgomery County, Arkansas, spread over 780.453 square miles. Averaged across its land area, Montgomery County runs about 11 people per square mile. Among counties sharing Montgomery County's EPA zone, it outranks 17% of them by population. Geologically, Montgomery County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

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

Testing and mitigation in Montgomery County

Mitigation cost doesn't depend on Montgomery 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

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

Montgomery 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.