Is Wayne County, MI a radon risk area?

EPA places Wayne 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 Wayne County in the 33rd percentile nationally for radon potential — higher than 33% of the counties EPA has rated.

How Wayne County compares

About 1,771,063 people live in Wayne County, Michigan, spread over 611.843 square miles. Population density there runs about 2,895 people per square mile. Rank 12 by population within its EPA zone puts Wayne County at the 99th percentile among zone peers. Geologically, Wayne County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

What this actually means for a house in Wayne County

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Wayne County's Zone 3 prediction is the low end of the scale. Don't read Zone 3 as a pass for Wayne County — EPA's guidance to test every home makes no exception for counties predicted low.

Testing and mitigation in Wayne County

Nothing about Wayne County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Michigan's state radon program

Wayne County's test kit answers today; a Airthings radon monitor keeps answering for Wayne 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. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.