What EPA's radon map says about Osceola County

EPA's own radon map rates Osceola County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Osceola County in the 15th percentile nationally for radon potential — higher than 15% of the counties EPA has rated.

How Osceola County compares

About 23,484 people live in Osceola County, Michigan, spread over 566.291 square miles. Population density there runs about 41 people per square mile. Among counties sharing Osceola County's EPA zone, it outranks 46% of them by population. Osceola 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 Osceola County

Osceola County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. A Zone 3 label describes Osceola County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Osceola County tests above the action level

Mitigation cost doesn't depend on Osceola 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 Michigan's state radon program

Osceola County's test kit answers today; a Airthings radon monitor keeps answering for Osceola 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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Osceola County carries, the zone explainer covers what it does and doesn't tell you about any one house.