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

EPA places Lapeer County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 59th percentile for radon potential — Lapeer County outranks 59% of every county EPA has rated.

Where Lapeer County sits nationally

Lapeer County, Michigan is home to about 89,168 people across 647.475 square miles. Averaged across its land area, Lapeer County runs about 138 people per square mile. By population, Lapeer County is the 222nd largest of every county sharing its EPA zone — the 79th percentile by population within that zone. Geologically, Lapeer County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Zone vs. an actual test

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 Lapeer County's Zone 2 prediction. A county-wide moderate average, like Lapeer County's, can still hide a specific house well above or below it — testing is what actually answers the question.

If Lapeer County tests above the action level

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

Where Lapeer County's figures come from

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