Cape May County, NJ radon potential

EPA places Cape May County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Cape May County ranks higher in radon potential than 26% of rated counties (the 26th percentile).

Cape May County by the numbers

Cape May County, New Jersey is home to about 93,875 people across 251.513 square miles. Population density there runs about 373 people per square mile. Within its own EPA zone, Cape May County is bigger by population than 78% of the counties that share it. Cape May County falls in EPA Radon Region 2, one of 83 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Cape May 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. A Zone 3 label describes Cape May County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Testing and mitigation in Cape May County

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

Where Cape May 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.