The Flint River drains portions of seven counties in mid-Michigan. The watershed is more than 1,300 square miles and consists of hundreds of tributary creeks, lakes, and the Flint River proper. In 2013 the Department of Environmental Quality (DEQ, now EGLE) detected PFAS in samples from the Flint River. The discovery of the elevated concentrations of PFAS in the Flint River has led to numerous investigations of potential sources and mitigation efforts, including Gilkey Creek and Lapeer Plating and Plastics.
The city of Flint currently obtains its drinking water from the Great Lakes Water Authority, which was tested in November 2017 and found not to have detectable levels of PFAS. For latest test results, contact the Great Lakes Water Authority directly.
- Water samples from selected rivers, including the Flint River, were analyzed for PFOS (perfluorooctane sulfonate) and PFOA (perfluorooctanoic acid). Flint River concentrations were below human health screening levels. Additional monitoring was not conducted at that time.
- The DEQ collected samples from the Flint River. Levels of PFOS in the Flint River at both M-13 (39-42 parts per trillion [ppt]) and near Montrose (50-51 ppt) were higher than those initially measured in 2001 and exceeded the Rule 57 value of 12 ppt PFOS for surface water quality. The samples collected were downstream of Flint’s drinking water intakes, and the results were below the 70 ppt combined PFOS and PFOA advisory level for drinking water.