Antrim County, MI: EPA's radon zone, explained

Antrim 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. Nationally that's the 48th percentile for radon potential — Antrim County outranks 48% of every county EPA has rated.

Antrim County by the numbers

Antrim County, Michigan is home to about 24,536 people across 475.69 square miles. Population density there runs about 52 people per square mile. By population, Antrim County is the 559th largest of every county sharing its EPA zone — the 46th percentile by population within that zone. Geologically, Antrim County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Zone vs. an actual test

Antrim 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. Antrim County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Testing and mitigation in Antrim County

For a Antrim County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Michigan's state radon program

For Antrim County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Antrim County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Antrim County's figures come from

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.