What EPA's radon map says about Sheboygan County

EPA's own radon map rates Sheboygan 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 Sheboygan County lands in the 61st percentile for radon potential.

Where Sheboygan County sits nationally

About 118,331 people live in Sheboygan County, Wisconsin, spread over 511.519 square miles. Averaged across its land area, Sheboygan County runs about 231 people per square mile. Among counties sharing Sheboygan County's EPA zone, it outranks 84% of them by population. EPA's geology-based Region 5 groups Sheboygan County with 523 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Sheboygan County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Sheboygan County — testing is the only way to know an individual home's actual level.

Testing and mitigation in Sheboygan County

Mitigation cost doesn't depend on Sheboygan 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

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

The methodology guide shows exactly which EPA and Census sources feed Sheboygan County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.