Chautauqua County, NY radon potential

EPA places Chautauqua 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. Nationally that's the 95th percentile for radon potential — Chautauqua County outranks 95% of every county EPA has rated.

How Chautauqua County compares

Chautauqua County, New York is home to about 124,105 people across 1,060.41 square miles. Population density there runs about 117 people per square mile. Within its own EPA zone, Chautauqua County is bigger by population than 85% of the counties that share it. Geologically, Chautauqua 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

Chautauqua County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. Being in Zone 1 raises the odds Chautauqua 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.

Next steps for a home in Chautauqua 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 New York's state radon program

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

Where Chautauqua County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Chautauqua County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.