Cecil County, MD radon potential

EPA's own radon map rates Cecil County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 60th percentile for radon potential — Cecil County outranks 60% of every county EPA has rated.

Where Cecil County sits nationally

Cecil County, Maryland is home to about 106,305 people across 346.3 square miles. Averaged across its land area, Cecil County runs about 307 people per square mile. Within its own EPA zone, Cecil County is bigger by population than 82% of the counties that share it. Cecil County falls in EPA Radon Region 3, one of 245 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Cecil County

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 Cecil County's Zone 2 prediction. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Cecil County — testing is the only way to know an individual home's actual level.

Next steps for a home in Cecil 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 Cecil County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Cecil 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 Cecil 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.