What EPA's radon map says about Ingham County

EPA's own radon map rates Ingham County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Ingham County sits at the 63rd percentile nationally for radon potential — above 63 of every 100 rated counties.

Where Ingham County sits nationally

About 290,427 people live in Ingham County, Michigan, spread over 556.081 square miles. Population density there runs about 522 people per square mile. Among counties sharing Ingham County's EPA zone, it outranks 92% of them by population. EPA's geology-based Region 5 groups Ingham County with 523 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Ingham County's Zone 2 prediction. Nothing about a Zone 2 label lowers the case for testing in Ingham County — EPA recommends it in every zone, moderate included.

If Ingham County tests above the action level

Mitigation cost doesn't depend on Ingham 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

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

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