A brief history: 1,4 dioxane is an industrial solvent that was used by Gelman Sciences in the manufacture of medical filters. According to the EPA, dioxane is a carcinogen. Gelman disposed of the solvent by spraying it on the ground, storing it in lagoons, and injecting it into the ground. This has led to the contamination of many people’s wells and concerns about the long-term risk to Ann Arbor’s drinking water.
There is currently no 1,4 dioxane in Ann Arbor Water. We regularly test for dioxane in our water supply using highly-sensitive tests. It has not shown up. Several years ago one of our supply wells was contaminated with 1,4 dioxane, and the City took that well out of service, even though the level of dioxane was below the state and federal standards. Continue reading