Somerset County, MD radon potential

EPA places Somerset 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 Somerset County in the 16th percentile nationally for radon potential — higher than 16% of the counties EPA has rated.

Where Somerset County sits nationally

Somerset County, Maryland is home to about 25,241 people across 319.749 square miles. That works out to roughly 79 people per square mile. Within its own EPA zone, Somerset County is bigger by population than 47% of the counties that share it. Geologically, Somerset County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

What this actually means for a house in Somerset County

Somerset 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 Somerset 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 Somerset 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 Maryland's state radon program

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

Where Somerset 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.