Wicomico County, MD radon potential

Wicomico County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Wicomico County sits at the 26th percentile nationally for radon potential — above 26 of every 100 rated counties.

Wicomico County by the numbers

Wicomico County, Maryland is home to about 106,329 people across 374.423 square miles. Population density there runs about 284 people per square mile. Within its own EPA zone, Wicomico County is bigger by population than 80% of the counties that share it. EPA's geology-based Region 3 groups Wicomico County with 244 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Wicomico County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. A Zone 3 label describes Wicomico County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Wicomico 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 Wicomico County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Wicomico 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 Wicomico 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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.