Is Adams County, WI a radon risk area?

Adams County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Nationally that's the 47th percentile for radon potential — Adams County outranks 47% of every county EPA has rated.

Where Adams County sits nationally

About 21,352 people live in Adams County, Wisconsin, spread over 645.646 square miles. Population density there runs about 33 people per square mile. Rank 602 by population within its EPA zone puts Adams County at the 42nd percentile among zone peers. Adams County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

EPA's Zone 2 rating for Adams County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A county-wide moderate average, like Adams County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Next steps for a home in Adams County

Nothing about Adams 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

Adams County's test kit answers today; a Airthings radon monitor keeps answering for Adams 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. Whatever zone Adams County carries, the zone explainer covers what it does and doesn't tell you about any one house.