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The Michigan Department of Environment, Great Lakes and Energy, or EGLE, tests groundwater at airports across Michigan.
They’re looking for residue of a firefighting foam that airports use to train with in case there’s an accident.
That foam contains PFAS, which can be dangerous to human health if they end up in drinking water.
In November, EGLE found evidence of PFAS at levels higher than quality standards at the Gogebic-Iron County airport.
“Because of testing at Gogebic airport, we want to make sure that there was no problem with either soil or groundwater at the airport,” Mike Jury, the EGLE site lead, said.