The U.S. EPA says a preliminary assessment of the 1,4 dioxane contamination spreading in the city of Ann Arbor's groundwater shows the site has a "good chance of being listed under the federal government's Superfund program.
Gelman Sciences was sold to the Pall Corporation in 1997, so most news coverage now calls it the “Pall Corp. clean-up” even though dioxane use was discontinued while Gelman still owned the company. Also, Pall was acquired by the Danaher Corporation in 2015 though the Pall name was retained.
This is a great summary about the history of the cleanup from the AADL: History of the Pall-Gelman Dioxane Groundwater Contamination Cleanup
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Thanks for the link. I only recently became aware of the dioxane plume, so this was a good way to get up to speed.