What EPA's radon map says about Eau Claire County

Eau Claire 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. Rank it against the rest of the country and Eau Claire County lands in the 60th percentile for radon potential.

How Eau Claire County compares

About 108,830 people live in Eau Claire County, Wisconsin, spread over 637.922 square miles. Averaged across its land area, Eau Claire County runs about 171 people per square mile. Among counties sharing Eau Claire County's EPA zone, it outranks 82% of them by population. EPA's geology-based Region 5 groups Eau Claire County with 523 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

EPA's Zone 2 rating for Eau Claire County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Eau Claire 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 Eau Claire County

Mitigation cost doesn't depend on Eau Claire County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Wisconsin's state radon program

Eau Claire County's test kit answers today; a Airthings radon monitor keeps answering for Eau Claire County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

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.