Oswego County, NY: EPA's radon zone, explained

EPA's own radon map rates Oswego County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 61st percentile for radon potential — Oswego County outranks 61% of every county EPA has rated.

Where Oswego County sits nationally

Oswego County, New York is home to about 118,305 people across 951.62 square miles. That works out to roughly 124 people per square mile. By population, Oswego County is the 171st largest of every county sharing its EPA zone — the 84th percentile by population within that zone. EPA's geology-based Region 2 groups Oswego County with 82 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Oswego County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Oswego County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Next steps for a home in Oswego County

For a Oswego County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find New York's state radon program

For Oswego County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Oswego 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 Oswego County's figures come from

Oswego County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.