What EPA's radon map says about Herkimer County

EPA places Herkimer County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 23rd percentile for radon potential — Herkimer County outranks 23% of every county EPA has rated.

Herkimer County by the numbers

About 59,585 people live in Herkimer County, New York, spread over 1,410.587 square miles. That works out to roughly 42 people per square mile. Among counties sharing Herkimer County's EPA zone, it outranks 71% of them by population. EPA's geology-based Region 2 groups Herkimer County with 82 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Herkimer County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Herkimer County testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Herkimer County

Mitigation cost doesn't depend on Herkimer 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

Herkimer County's test kit answers today; a Airthings radon monitor keeps answering for Herkimer County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 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. Whatever zone Herkimer County carries, the zone explainer covers what it does and doesn't tell you about any one house.