Marinette County, WI radon potential

EPA places Marinette 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. Nationally, Marinette County ranks higher in radon potential than 54% of rated counties (the 54th percentile).

How Marinette County compares

Marinette County, Wisconsin is home to about 42,343 people across 1,399.468 square miles. That works out to roughly 30 people per square mile. Within its own EPA zone, Marinette County is bigger by population than 63% of the counties that share it. Marinette County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Marinette County

Marinette County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. Marinette 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 Marinette County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Wisconsin's state radon program

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

Where Marinette County's figures come from

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