Is Essex County, NJ a radon risk area?

Essex 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 65th percentile for radon potential — Essex County outranks 65% of every county EPA has rated.

Where Essex County sits nationally

About 881,527 people live in Essex County, New Jersey, spread over 126.082 square miles. Population density there runs about 6,992 people per square mile. Rank 24 by population within its EPA zone puts Essex County at the 98th percentile among zone peers. Essex County falls in EPA Radon Region 2, one of 83 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

EPA's Zone 2 rating for Essex County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A county-wide moderate average, like Essex County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Next steps for a home in Essex County

Nothing about Essex County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find New Jersey's state radon program

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

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Essex County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.