Harnett County, NC radon potential

EPA's own radon map rates Harnett County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 27th percentile for radon potential — Harnett County outranks 27% of every county EPA has rated.

How Harnett County compares

Harnett County, North Carolina is home to about 146,096 people across 595.099 square miles. That works out to roughly 245 people per square mile. Within its own EPA zone, Harnett County is bigger by population than 83% of the counties that share it. Geologically, Harnett 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 Harnett County

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Harnett County's Zone 3 prediction is the low end of the scale. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Harnett County testing above the action level often enough that skipping a test isn't the safe assumption.

If Harnett County tests above the action level

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

Where Harnett County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.