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

Forest 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. Forest County sits at the 39th percentile nationally for radon potential — above 39 of every 100 rated counties.

Where Forest County sits nationally

Forest County, Wisconsin is home to about 9,506 people across 1,014.265 square miles. That works out to roughly 9 people per square mile. By population, Forest County is the 830th largest of every county sharing its EPA zone — the 20th percentile by population within that zone. Geologically, Forest County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Zone vs. an actual test

EPA's Zone 2 rating for Forest County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Forest County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Testing and mitigation in Forest County

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

Where Forest County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.