What EPA's radon map says about Chemung County

EPA places Chemung 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. Chemung County sits at the 93rd percentile nationally for radon potential — above 93 of every 100 rated counties.

Where Chemung County sits nationally

About 81,115 people live in Chemung County, New York, spread over 407.334 square miles. Population density there runs about 199 people per square mile. Among counties sharing Chemung County's EPA zone, it outranks 79% of them by population. Geologically, Chemung 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

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Chemung County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Chemung County specifically.

Testing and mitigation in Chemung County

Mitigation cost doesn't depend on Chemung 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 New York's state radon program

Chemung County's test kit answers today; a Airthings radon monitor keeps answering for Chemung 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.