What EPA's radon map says about Genesee County

Genesee 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. That puts Genesee County in the 64th percentile nationally for radon potential — higher than 64% of the counties EPA has rated.

How Genesee County compares

About 402,279 people live in Genesee County, Michigan, spread over 636.946 square miles. Averaged across its land area, Genesee County runs about 632 people per square mile. Among counties sharing Genesee County's EPA zone, it outranks 94% of them by population. Genesee County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Genesee County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Genesee County — testing is the only way to know an individual home's actual level.

If Genesee County tests above the action level

Mitigation cost doesn't depend on Genesee 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

Genesee County's test kit answers today; a Airthings radon monitor keeps answering for Genesee 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 Genesee County's numbers. Whatever zone Genesee County carries, the zone explainer covers what it does and doesn't tell you about any one house.