What EPA's radon map says about Atlantic County

EPA's own radon map rates Atlantic County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 30th percentile for radon potential — Atlantic County outranks 30% of every county EPA has rated.

How Atlantic County compares

About 279,114 people live in Atlantic County, New Jersey, spread over 555.583 square miles. Population density there runs about 502 people per square mile. Among counties sharing Atlantic County's EPA zone, it outranks 91% of them by population. EPA's geology-based Region 2 groups Atlantic County with 82 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

A Zone 3 county like Atlantic County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Atlantic County — EPA's guidance to test every home makes no exception for counties predicted low.

Next steps for a home in Atlantic County

Mitigation cost doesn't depend on Atlantic 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 New Jersey's state radon program

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

Atlantic 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.