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chloroform

Chloroform was detected in the groundwater at about 5 parts per billion in some tests in Waterworks Park in Ann Arbor.
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State officials have a new water contamination investigation on their hands: what is the source of newly-discovered contaminants found in the groundwater near Slauson Middle School in Ann Arbor?

The Michigan Department of Environmental Quality discovered the chemicals trichloroethane and chloroform there after conducting tests for a different chemical - 1,4 dioxane. 

The 1,4 dioxane is a known contaminant from the chemical company Pall-Gelman. The plume of 1,4 dioxane is slowly moving underneath Ann Arbor towards the Huron River.