What EPA's radon map says about Stanly County

Stanly County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Stanly County sits at the 24th percentile nationally for radon potential — above 24 of every 100 rated counties.

Where Stanly County sits nationally

About 67,326 people live in Stanly County, North Carolina, spread over 395.08 square miles. That works out to roughly 170 people per square mile. Among counties sharing Stanly County's EPA zone, it outranks 73% of them by population. Stanly County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Stanly County's Zone 3 prediction is the low end of the scale. A Zone 3 rating means Stanly 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 Stanly County

Mitigation cost doesn't depend on Stanly 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

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

Stanly County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.