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A large plume of contamination in Ann Arbor, Michigan's, water supply is continuing to spread. The groundwater contains dixoane which was released in the 1980s by Gelman Sciences on Wagner Road in Scio Township. Gelman Sciences, a former manufacturer of medical filters, still exists on the same site with an unmarked building. The building's only purpose is for the company to treat contaminated water, per a court order. The toxic chemicals were found in surface waters and groundwater and, residential wells.
The "Gelman plume" is estimated to be about four miles long and about a mile wide. The plume is moving at a rate of about a foot a day, according to Dan Hamel of the Michigan Department of Environment, Great Lakes, and Energy (EGLE). It's now in areas of Scio Township and the west side of Ann Arbor. The plume appears to be heading north to Barton Pond and east to the Huron River, Ann Arbor's largest sources of drinking water.