Gloucester County, NJ radon potential

Gloucester County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Nationally that's the 64th percentile for radon potential — Gloucester County outranks 64% of every county EPA has rated.

Where Gloucester County sits nationally

Gloucester County, New Jersey is home to about 311,783 people across 322.009 square miles. Averaged across its land area, Gloucester County runs about 968 people per square mile. Within its own EPA zone, Gloucester County is bigger by population than 93% of the counties that share it. Geologically, Gloucester County is grouped into EPA Region 2 alongside 82 other counties that share its rock and soil setting.

What this actually means for a house in Gloucester County

EPA's Zone 2 rating for Gloucester County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Gloucester County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

If Gloucester 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 New Jersey's state radon program

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

Where Gloucester County's figures come from

Gloucester 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.