Is Arenac County, MI a radon risk area?

EPA places Arenac 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. Nationally, Arenac County ranks higher in radon potential than 10% of rated counties (the 10th percentile).

Where Arenac County sits nationally

About 15,087 people live in Arenac County, Michigan, spread over 363.178 square miles. Averaged across its land area, Arenac County runs about 42 people per square mile. Rank 710 by population within its EPA zone puts Arenac County at the 31st percentile among zone peers. Geologically, Arenac County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Zone vs. an actual test

A Zone 3 county like Arenac County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Arenac County testing above the action level often enough that skipping a test isn't the safe assumption.

If Arenac County tests above the action level

Nothing about Arenac 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

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

Arenac County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Arenac County carries, the zone explainer covers what it does and doesn't tell you about any one house.