Monthly Surface Water System Monitoring

In April 2019, EGLE began monthly sampling of Public Water Supplies sampled during Phase I of the Statewide PFAS Sampling Survey which utilize surface water as a source. This sampling will be done for six months and will help determine if there are changes in PFAS levels for these 65 supplies over time, due to their use of surface water as a source.

In addition to PFAS testing for these 65 supplies, EGLE will collect and analyze samples for select cyanotoxins related to harmful algal blooms (HABs), to investigate whether these surface water sources are being affected. This testing program is being conducted by the EGLE Drinking Water and Environmental Health Division Community Water Supply Section. The results of this initiative will be provided by that group, once results become available.

Sampling results will be provided on this page, once they are available. 

Other PFAS testing initiatives for drinking water:

Understanding the Sample Results

NOTE: The population of the Saginaw-Midland
Water Supply (WSSN 05880) includes those
populations served by Au Gres, Linwood
Metropolitan District, Omer, Sims-Whitney Utilities
Authority, Standish, Bay Area Water System,
Midland, and Saginaw. 

Definitions of the information provided in the sampling results tables:

  • Population Served: The number of individuals served by the water supply.
  • Round Sample was Taken: The round of sampling in which the sample was taken.
  • Sample Date: The date samples were taken at the water supply.
  • Sample Number: The identification number that corresponds to the sample taken.
  • Raw Water or Treated Drinking Water: The location where the water sample was collected. If the table shows “Raw Water” the sample was taken directly from the well or water source. If the table shows “Treated Drinking Water” the sample was taken after the water passed through treatment system(s) the water supply has in place.
  • PFOA + PFOS (ppt): The amount of PFOA and PFOS added together.
    • If the results listed is “ND” the lab did not detect, or find, that PFAS was in the water sample.
  • Total Tested PFAS (ppt): The amount of all PFAS chemicals that were tested added together.
    • If the results listed is “ND” the lab did not detect, or find, that PFAS was in the water sample.
  • Method: The laboratory method used for analyzing the samples. For more information, please visit the Frequently Asked Questions.

*Results are provided in parts per trillion. A part per trillion (ppt) is the equivalent of 1 drop of water in 20 Olympic-size swimming pools

For support in communicating results to your customers, please visit our Toolkit for Public Water Supplies or Toolkit for Schools for documents to help in your outreach.

The table below shows testing results from the statewide sampling initiative for Michigan public water supplies. Additional results from the testing will be added as they become available.

The Public Water Supplies dataset is available for download on the data.Michigan.gov open data portal.