Is Allegany County, NY a radon risk area?

EPA places Allegany County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Allegany County lands in the 89th percentile for radon potential.

How Allegany County compares

About 47,299 people live in Allegany County, New York, spread over 1,029.507 square miles. That works out to roughly 46 people per square mile. Rank 330 by population within its EPA zone puts Allegany County at the 69th percentile among zone peers. Geologically, Allegany County is grouped into EPA Region 2 alongside 82 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Allegany County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. Being in Zone 1 raises the odds Allegany County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

If Allegany County tests above the action level

Nothing about Allegany County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find New York's state radon program

Allegany County's test kit answers today; a Airthings radon monitor keeps answering for Allegany County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.