What EPA's radon map says about Yancey County

EPA places Yancey County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Yancey County sits at the 45th percentile nationally for radon potential — above 45 of every 100 rated counties.

Where Yancey County sits nationally

About 18,993 people live in Yancey County, North Carolina, spread over 312.592 square miles. Averaged across its land area, Yancey County runs about 61 people per square mile. Among counties sharing Yancey County's EPA zone, it outranks 38% of them by population. Geologically, Yancey 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 Yancey County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Yancey County's Zone 2 prediction lands in the gap between the two. Yancey County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Testing and mitigation in Yancey County

Mitigation cost doesn't depend on Yancey 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

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

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