Duplin County, NC radon potential

Duplin County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Rank it against the rest of the country and Duplin County lands in the 22nd percentile for radon potential.

How Duplin County compares

Duplin County, North Carolina is home to about 50,539 people across 814.72 square miles. Averaged across its land area, Duplin County runs about 62 people per square mile. Within its own EPA zone, Duplin County is bigger by population than 67% of the counties that share it. EPA's geology-based Region 4 groups Duplin County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

A Zone 3 county like Duplin County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. A Zone 3 label describes Duplin County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Testing and mitigation in Duplin County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find North Carolina's state radon program

For Duplin County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Duplin County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Duplin County's figures come from

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