What EPA's radon map says about Garrett County

EPA's own radon map rates Garrett County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. That puts Garrett County in the 50th percentile nationally for radon potential — higher than 50% of the counties EPA has rated.

How Garrett County compares

About 28,393 people live in Garrett County, Maryland, spread over 649.077 square miles. That works out to roughly 44 people per square mile. Among counties sharing Garrett County's EPA zone, it outranks 51% of them by population. Garrett County falls in EPA Radon Region 3, one of 245 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Garrett County's Zone 2 prediction. Nothing about a Zone 2 label lowers the case for testing in Garrett County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Garrett County

Mitigation cost doesn't depend on Garrett County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Maryland's state radon program

Garrett County's test kit answers today; a Airthings radon monitor keeps answering for Garrett County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

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.