Is Oconto County, WI a radon risk area?

EPA's own radon map rates Oconto County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Rank it against the rest of the country and Oconto County lands in the 53rd percentile for radon potential.

Oconto County by the numbers

About 40,037 people live in Oconto County, Wisconsin, spread over 997.48 square miles. Averaged across its land area, Oconto County runs about 40 people per square mile. Rank 400 by population within its EPA zone puts Oconto County at the 61st percentile among zone peers. EPA's geology-based Region 5 groups Oconto County with 523 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Oconto County

EPA's Zone 2 rating for Oconto County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Oconto County — testing is the only way to know an individual home's actual level.

If Oconto County tests above the action level

Nothing about Oconto 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 Wisconsin's state radon program

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

Oconto County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Oconto County carries, the zone explainer covers what it does and doesn't tell you about any one house.