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EPA adds Gelman 1,4-dioxane plume to Superfund National Priorities List, Ann Arbor official says

City of Ann Arbor · March 26, 2026
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Summary

Erin Donnelly, Environmental Services Manager for the City of Ann Arbor, said the EPA added the Gelman 1,4-dioxane plume to the National Priorities List on March 12, shifting oversight from the State of Michigan to the EPA and initiating a long-term federal cleanup process. The city said drinking water testing continues and results are posted online.

Erin Donnelly, Environmental Services Manager for the City of Ann Arbor, said on a city briefing that the Environmental Protection Agency added the Gelman 1,4-dioxane plume to the National Priorities List on March 12, a formal Superfund designation that places the site under federal cleanup oversight.

"On March 12th, the EPA added the Gelman 1,4-dioxane plume to the National Priorities List, which puts the full weight of…

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