What EPA's radon map says about Ocean County

Ocean County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally that's the 32nd percentile for radon potential — Ocean County outranks 32% of every county EPA has rated.

Ocean County by the numbers

About 666,434 people live in Ocean County, New Jersey, spread over 628.291 square miles. That works out to roughly 1,061 people per square mile. Among counties sharing Ocean County's EPA zone, it outranks 96% of them by population. EPA's geology-based Region 2 groups Ocean County with 82 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Ocean County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Ocean County — EPA's guidance to test every home makes no exception for counties predicted low.

If Ocean County tests above the action level

Mitigation cost doesn't depend on Ocean 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

Ocean County's test kit answers today; a Airthings radon monitor keeps answering for Ocean County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

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