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

Chippewa 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. Chippewa County sits at the 57th percentile nationally for radon potential — above 57 of every 100 rated counties.

How Chippewa County compares

Chippewa County, Wisconsin is home to about 67,323 people across 1,008.43 square miles. Population density there runs about 67 people per square mile. By population, Chippewa County is the 275th largest of every county sharing its EPA zone — the 73rd percentile by population within that zone. Geologically, Chippewa County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

What this actually means for a house in Chippewa County

EPA's Zone 2 rating for Chippewa County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Nothing about a Zone 2 label lowers the case for testing in Chippewa County — EPA recommends it in every zone, moderate included.

If Chippewa County tests above the action level

For a Chippewa 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 Chippewa County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Chippewa 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 Chippewa County's figures come from

Chippewa County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.