Anne Arundel County, MD radon potential

Anne Arundel 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 — Anne Arundel County outranks 65% of every county EPA has rated.

Where Anne Arundel County sits nationally

Anne Arundel County, Maryland is home to about 602,350 people across 414.808 square miles. Averaged across its land area, Anne Arundel County runs about 1,452 people per square mile. Within its own EPA zone, Anne Arundel County is bigger by population than 96% of the counties that share it. Anne Arundel County falls in EPA Radon Region 3, one of 245 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Anne Arundel County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Anne Arundel 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 Anne Arundel 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 Maryland's state radon program

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

Where Anne Arundel County's figures come from

Anne Arundel County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.