What EPA's radon map says about Montgomery County

Montgomery County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Montgomery County sits at the 16th percentile nationally for radon potential — above 16 of every 100 rated counties.

How Montgomery County compares

About 26,364 people live in Montgomery County, North Carolina, spread over 491.539 square miles. Population density there runs about 54 people per square mile. Among counties sharing Montgomery County's EPA zone, it outranks 49% of them by population. Geologically, Montgomery County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

What this actually means for a house in Montgomery County

Montgomery County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. A Zone 3 rating means Montgomery County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Next steps for a home 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 North Carolina'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. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Montgomery County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.