What EPA's radon map says about Iron County

EPA's own radon map rates Iron County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally, Iron County ranks higher in radon potential than 41% of rated counties (the 41st percentile).

Where Iron County sits nationally

About 11,709 people live in Iron County, Michigan, spread over 1,166.116 square miles. Averaged across its land area, Iron County runs about 10 people per square mile. Among counties sharing Iron County's EPA zone, it outranks 23% of them by population. EPA's geology-based Region 5 groups Iron County with 523 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Iron County's Zone 2 prediction lands in the gap between the two. Nothing about a Zone 2 label lowers the case for testing in Iron County — EPA recommends it in every zone, moderate included.

If Iron County tests above the action level

Mitigation cost doesn't depend on Iron 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

Iron County's test kit answers today; a Airthings radon monitor keeps answering for Iron County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

Iron County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.