• a map showing the huron river and the outline of the huron river watershedUpdated: May 21, 2020
    The Huron River drains portions of seven counties in Southeast Michigan. The Huron River Watershed is more than 900 square miles and consists of hundreds of tributary creeks, lakes, and the Huron River proper. The Michigan Department of Environment, Great Lakes, and Energy (EGLE) began sampling intensively on the Huron River due to the city of Ann Arbor detecting per- and polyfluoroalkyl substances (PFAS) in the Huron River, which is the main source of the city of Ann Arbor’s drinking water, and the discovery of perfluorooctanesulfonic acid (PFOS) in the river at levels over the Rule 57 Water Quality Standard (WQS) of 11 ppt PFOS. The following is a timeline of PFAS investigation activities in the Huron River Watershed.
    These investigations have also led to fish consumption advisories to protect the public, which are available on the Michigan Department of Health and Human Services' (MDHHS) Michigan Eat Safe Fish website and the Michigan PFAS Action Response website. PFAS is the family of per- and polyfluoroalkyl substances. One of the most commonly detected substances in fish tissue is perfluorooctanesulfonic acid (PFOS), in part because it bioaccumulates, or builds up, in the food web.