What EPA's radon map says about Gladwin County

EPA places Gladwin County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Gladwin County in the 16th percentile nationally for radon potential — higher than 16% of the counties EPA has rated.

Gladwin County by the numbers

About 25,995 people live in Gladwin County, Michigan, spread over 501.787 square miles. Averaged across its land area, Gladwin County runs about 52 people per square mile. Among counties sharing Gladwin County's EPA zone, it outranks 49% of them by population. EPA's geology-based Region 5 groups Gladwin County with 523 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Gladwin 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. Even at Zone 3, Gladwin County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Next steps for a home in Gladwin County

Mitigation cost doesn't depend on Gladwin 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

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

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