Dioxane test results reported by MDEQ for Ann Arbor neighborhood

LANSING, MI – The Michigan Department of Environmental Quality (MDEQ) today released test results for shallow groundwater in Ann Arbor, near the area of contaminated groundwater known as the Gelman Sciences plume. DEQ

The results show the concentrations of 1,4-Dioxane in 16 temporary test wells in the neighborhoods west and southwest of West Park in the City of Ann Arbor (City) do not exceed MDEQ screening levels protective of indoor air.

“Our initial testing shows concentrations of 1,4-Dioxane detected in shallow groundwater in a limited area of the city do not exceed proposed screening levels protective of indoor air,” said Mitch Adelman, MDEQ District Supervisor.

The testing was conducted in response to public concerns regarding the presence of contamination in shallow groundwater in close proximity to homes and business. City residents communicated their concerns earlier this year to MDEQ officials at an April 18 town hall meeting organized by Representative Jeff Irwin.

Migration of contaminants from groundwater into indoor air is a new pathway of exposure in connection with the Gelman Sciences plume that the MDEQ is looking at very closely.

The chemical 1,4-Dioxane is an industrial solvent that has been linked to human health concerns at certain concentrations given long-term exposure.  The MDEQ and the citizens of the City have been focused on the drinking water standard as it pertains to the Gelman contaminant plume.  The Gelman 1,4-Dioxane plume encompasses approximately three square miles of groundwater beneath the City and parts of Ann Arbor and Scio Townships.

“The MDEQ’s first priority is to protect public health,” Adelman said. “We are committed to open communications and transparency of our actions in affected communities. We will work with local stakeholders to ensure residents are informed and supported as this process moves forward.”

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