What EPA's radon map says about Kent County

EPA places Kent 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 65th percentile for radon potential — Kent County outranks 65% of every county EPA has rated.

Where Kent County sits nationally

About 673,002 people live in Kent County, Michigan, spread over 849.545 square miles. Averaged across its land area, Kent County runs about 792 people per square mile. Among counties sharing Kent County's EPA zone, it outranks 97% of them by population. Kent County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

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 Kent County's Zone 2 prediction. Nothing about a Zone 2 label lowers the case for testing in Kent County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Kent County

Mitigation cost doesn't depend on Kent 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

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

More on how this number was built

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