Mt. Clemens (Clinton River/Lake St. Clair)

There are two sites in the Mt. Clemens area: the Clinton River and Lake St. Clair.           

  • PFOS and PFOA were detected in the two surface water samples collected on August 31, 2017, 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.
  • DHHS has issued fish advisories for bluegill and sunfish as a result of PFOS concentrations.
  • Downstream drinking water systems in the Detroit River and lower Lake St. Clair were sampled in November 2017.All results were non-detect, with reporting limits ranging from 1.93 to 2.43 ppt.These samples are not included in the table because they are not immediately in the area of the site.
  • Effluent from area waste water treatment plants has been sampled for PFOS and PFOA.The results ranged from 5.6 to 14 ppt.
  • AECOM has conducted sampling of the soil, groundwater, and surface water at Selfridge under contract with the National Guard Bureau.Validated results from this sampling are expected in July 2018.
  • Validated outfall data has been received from Selfridge.Elevated levels of both PFOS and PFOA were detected in the outfalls.The highest concentrations are 2,400 ppt and 290 ppt, respectively.
  • AECOM sampled the raw and finished drinking water from the Ira Township, New Baltimore, and Mount Clemens drinking water plants in January 2018.While PFAS were detected, the combined levels of PFOS and PFOA were well below the LHA of 70 ppt.These samples are included in the table below.
  • Another round of surface water samples were collected in the Clinton River in February 2018.PFOS and PFOA concentrations were detected above the reporting limits. One sample exceeded the Rule 57 Value for PFOS at 43 ppt.
  • AECOM sampled residential wells near Selfridge and a Type II water supplier near Lake St. Clair on May 2, 2018.This sampling project is to determine PFAS levels in groundwater.We intend to sample more wells in the future.
  • Samples from the public water supply sampling is included in the table below.

# Public Water Supply Samples

# Public Water Supply Results Received

# Non-Detect (PFOS + PFOA)

#ND – 70 ppt (PFOS + PFOA)

#> 70 ppt (PFOS + PFOA)

Highest Public Water Supply value in ppt (PFOS + PFOA)

6

6

0

6

0

3.28