Kenosha County, WI: EPA's radon zone, explained

EPA places Kenosha County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Kenosha County sits at the 62nd percentile nationally for radon potential — above 62 of every 100 rated counties.

How Kenosha County compares

Kenosha County, Wisconsin is home to about 168,754 people across 271.833 square miles. Averaged across its land area, Kenosha County runs about 621 people per square mile. By population, Kenosha County is the 139th largest of every county sharing its EPA zone — the 87th percentile by population within that zone. Kenosha 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 Kenosha 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 Kenosha County — testing is the only way to know an individual home's actual level.

If Kenosha County tests above the action level

For a Kenosha County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Wisconsin's state radon program

For Kenosha County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Kenosha County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Kenosha County's figures come from

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