Michigan Appeals Court throws out cleanup order for dioxane plume under Ann Arbor

17 September, 2022
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Michigan Appeals Court throws out cleanup order for dioxane plume under Ann Arbor

The Michigan Court of Appeals rejected a Washtenaw County Circuit judge's June 2021 order forcing Gelman Sciences Inc. to step up its remediation efforts on a huge, chronic groundwater plume of cancer-causing dioxane beneath the Ann Arbor area.

The ruling reverts cleanup efforts to a 2011 Washtenaw Circuit Court consent judgment between Gelman and the state of Michigan. At that time, the "prohibition zone" restricting groundwater usage in an area of Ann Arbor and Scio and Ann Arbor townships was based on a drinking water standard of 85 parts per billion of dioxane. That standard was reduced in 2016 to 7.2 parts per billion, after the earlier standard was found to not sufficiently protect public health.

The appellate court's ruling "will put human health and our water at risk," said U.S. Rep. Debbie Dingell, D-Dearborn.


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