What EPA's radon map says about Davie County

EPA places Davie County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 21st percentile for radon potential — Davie County outranks 21% of every county EPA has rated.

How Davie County compares

About 45,383 people live in Davie County, North Carolina, spread over 263.699 square miles. That works out to roughly 172 people per square mile. Among counties sharing Davie County's EPA zone, it outranks 64% of them by population. Davie County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

At Zone 3, Davie County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Don't read Zone 3 as a pass for Davie County — EPA's guidance to test every home makes no exception for counties predicted low.

If Davie County tests above the action level

Mitigation cost doesn't depend on Davie 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

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