What EPA's radon map says about Crawford County

EPA's own radon map rates Crawford County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Rank it against the rest of the country and Crawford County lands in the 80th percentile for radon potential.

Crawford County by the numbers

About 16,008 people live in Crawford County, Wisconsin, spread over 570.805 square miles. Population density there runs about 28 people per square mile. Among counties sharing Crawford County's EPA zone, it outranks 40% of them by population. EPA's geology-based Region 5 groups Crawford County with 523 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Crawford County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Crawford County specifically.

Next steps for a home in Crawford County

Mitigation cost doesn't depend on Crawford 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

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

More on how this number was built

Crawford County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.