Berrien County, MI radon potential

EPA places Berrien 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. Berrien County sits at the 28th percentile nationally for radon potential — above 28 of every 100 rated counties.

Where Berrien County sits nationally

Berrien County, Michigan is home to about 152,703 people across 567.845 square miles. Population density there runs about 269 people per square mile. Within its own EPA zone, Berrien County is bigger by population than 84% of the counties that share it. EPA's geology-based Region 5 groups Berrien County with 523 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Berrien County

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Berrien County's Zone 3 prediction is the low end of the scale. A Zone 3 rating means Berrien County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Testing and mitigation in Berrien County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Michigan's state radon program

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

Where Berrien County's figures come from

Berrien 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.