Ashland County, WI radon potential

EPA places Ashland 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. That puts Ashland County in the 44th percentile nationally for radon potential — higher than 44% of the counties EPA has rated.

Where Ashland County sits nationally

Ashland County, Wisconsin is home to about 16,196 people across 1,044.97 square miles. That works out to roughly 15 people per square mile. Within its own EPA zone, Ashland County is bigger by population than 33% of the counties that share it. Ashland 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 Ashland County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Ashland County's Zone 2 prediction lands in the gap between the two. Nothing about a Zone 2 label lowers the case for testing in Ashland County — EPA recommends it in every zone, moderate included.

Next steps for a home in Ashland 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 Ashland County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Ashland 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 Ashland County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Ashland County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.