What EPA's radon map says about Orange County

Orange 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. Nationally that's the 50th percentile for radon potential — Orange County outranks 50% of every county EPA has rated.

How Orange County compares

About 30,050 people live in Orange County, Vermont, spread over 687.009 square miles. That works out to roughly 44 people per square mile. Among counties sharing Orange County's EPA zone, it outranks 53% of them by population. Geologically, Orange County is grouped into EPA Region 1 alongside 58 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Orange County's Zone 2 prediction. Nothing about a Zone 2 label lowers the case for testing in Orange County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Orange County

Mitigation cost doesn't depend on Orange 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 Vermont's state radon program

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

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.