What EPA's radon map says about Florence County

Florence 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. Nationally, Florence County ranks higher in radon potential than 36% of rated counties (the 36th percentile).

Florence County by the numbers

About 4,673 people live in Florence County, Wisconsin, spread over 488.029 square miles. Population density there runs about 10 people per square mile. Among counties sharing Florence County's EPA zone, it outranks 8% of them by population. EPA's geology-based Region 5 groups Florence County with 523 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Florence County

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Florence County's Zone 2 prediction. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Florence County — testing is the only way to know an individual home's actual level.

Next steps for a home in Florence County

Mitigation cost doesn't depend on Florence 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

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