Ann Arbor Municipal Water Treatment Plant

Ann Arbor Municipal Water Treatment Plant is a site which reflects known PFAS levels. Based on environmental and health concerns, further review and possible action may be necessary to best protect public health. More details about this location will be made available as soon as possible.

  • The first samples for PFAS compounds in drinking water occurred in March 2014, as required by the United States Environmental Protection Agency (US EPA) under Round 3 of the Unregulated Contaminant Monitoring Rule (UCMR3).
  • PFOS was detected in the drinking water sample collected on March 5, 2014 at 43 ppt.
  • The City of Ann Arbor informed their customers and conducted investigative sampling.
  • Sampling identified the Huron River as the source. There is currently an active investigation along the Huron River; the origin of PFOS in the river is unknown at this time.
  • The city continues to test both finished drinking water and the river source water for PFAS on a monthly basis.Regular updates are provided to the public on the low levels being reported in the drinking water.
  • The city is experimenting with methods of removing PFAS using granular activated carbon (GAC).It will be some time before results of that study are known.
  • The City of Ann Arbor was tested in mid-July 2018 as part of the MDEQ’s statewide initiative to test all public water supplies and schools with their own wells. Both the finished water and the intake for the supply were sampled. The results were available mid-August, and finished water results were 4 ppt PFOS and PFOA; intake results were 11 ppt PFOS and PFOA.
  • Additional results are available on the public water supply statewide sampling initiative page.

# 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) in ppt