Accomack County, VA radon potential

EPA places Accomack 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. That puts Accomack County in the 19th percentile nationally for radon potential — higher than 19% of the counties EPA has rated.

Where Accomack County sits nationally

Accomack County, Virginia is home to about 33,411 people across 449.305 square miles. Averaged across its land area, Accomack County runs about 74 people per square mile. Within its own EPA zone, Accomack County is bigger by population than 56% of the counties that share it. Accomack 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

Accomack 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. Even at Zone 3, Accomack County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

If Accomack 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 Virginia's state radon program

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

Where Accomack County's figures come from

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