What EPA's radon map says about Mecklenburg County

EPA places Mecklenburg 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. That puts Mecklenburg County in the 32nd percentile nationally for radon potential — higher than 32% of the counties EPA has rated.

Where Mecklenburg County sits nationally

About 1,206,285 people live in Mecklenburg County, North Carolina, spread over 523.602 square miles. Population density there runs about 2,304 people per square mile. Among counties sharing Mecklenburg County's EPA zone, it outranks 98% of them by population. Geologically, Mecklenburg 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 Mecklenburg County

Mecklenburg 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 Mecklenburg 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 Mecklenburg County

Mitigation cost doesn't depend on Mecklenburg 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

Mecklenburg County's test kit answers today; a Airthings radon monitor keeps answering for Mecklenburg County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Mecklenburg County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.