New Hanover County, NC radon potential

EPA places New Hanover 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 30th percentile for radon potential — New Hanover County outranks 30% of every county EPA has rated.

How New Hanover County compares

New Hanover County, North Carolina is home to about 243,333 people across 192.27 square miles. Population density there runs about 1,266 people per square mile. Within its own EPA zone, New Hanover County is bigger by population than 90% of the counties that share it. EPA's geology-based Region 4 groups New Hanover County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

At Zone 3, New Hanover 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. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like New Hanover County testing above the action level often enough that skipping a test isn't the safe assumption.

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

Where New Hanover County's figures come from

New Hanover County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone New Hanover County carries, the zone explainer covers what it does and doesn't tell you about any one house.