What EPA's radon map says about Oneida County

EPA's own radon map rates Oneida County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally, Oneida County ranks higher in radon potential than 53% of rated counties (the 53rd percentile).

Where Oneida County sits nationally

About 38,175 people live in Oneida County, Wisconsin, spread over 1,113.946 square miles. That works out to roughly 34 people per square mile. Among counties sharing Oneida County's EPA zone, it outranks 60% of them by population. EPA's geology-based Region 5 groups Oneida County with 523 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Oneida County's Zone 2 prediction. Middle-of-the-pack doesn't mean risk-free for any one Oneida County address — a moderate county average still leaves individual homes to test either side of it.

If Oneida County tests above the action level

Mitigation cost doesn't depend on Oneida 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 Wisconsin's state radon program

Oneida County's test kit answers today; a Airthings radon monitor keeps answering for Oneida County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

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 Oneida County carries, the zone explainer covers what it does and doesn't tell you about any one house.