The Clinton River drains portions of four counties in southeast Michigan. The Clinton River Watershed drains 760 square miles and flows 83 miles from its headwaters to Lake St. Clair. Lake St. Clair connects Lake Huron to its north with Lake Erie to its south. The Michigan Department of Environmental Quality (MDEQ) began sampling intensively in the Clinton River due to the discovery of perfluorooctanesulfonic acid (PFOS) in the river at levels over the Rule 57 water quality standard of 11 ppt PFOS.
The following is a timeline of PFAS investigation activities in the Clinton River / Lake St. Clair Watershed.
- PFOS and PFOA were detected in the two surface water samples collected on 8/31/17, from the Clinton River near the city of Mt. Clemens and along the Lake St. Clair shoreline just north of the Selfridge Air National Guard Base in Harrison Charter Township.These samples were collected as part of a targeted monitoring project designed to identify surface waters that could potentially have elevated levels of PFAS.
- As a follow-up to the initial findings, fish and surface water samples were collected in November 2017.Surface water samples in Lake St. Clair and the Clinton River contained PFOS above the applicable surface water criteria. The maximum value was 610 ppt.One elevated data point in the Clinton River is upstream of Selfridge ANGB.