Phase I -


On August 16, 2019, EGLE released the report describing the findings from the 2018 PFAS Sampling of Drinking Water Supplies in Michigan. The report consists of the main body and four appendices. 


The initial phase of statewide PFAS surveillance testing began in April 2018, and was originally conceived as a multi-year project covering drinking water for approximately 75% of Michigan’s residents. This effort initially included community water supplies, schools on their own well(s), and water supplies for Michigan’s federally-recognized tribes who chose to participate in this survey. In November 2018, sampling was expanded to also include child care providers and Michigan Head Start programs on their own well(s). Testing was ultimately done for the following supplies:pws

  • 1,112 Community Water Supplies (CWS)
  • 459 Schools on their own wells
  • 152 Daycares and MI Head Starts
  • 17 Tribal water systems

This sampling was completed in December 2018. Therefore, approximately 7.7 million of Michigan's 10 million residents have now had their drinking water tested for PFAS. The results of this testing are detailed in the interactive tables below. A summary report of the overall results is available to the right. 

View details on test methods used (pdf).

The Michigan Department of Environment, Great Lakes, and Energy (EGLE) has provided recommendations based on PFAS levels. View this notification protocol (pdf).

Beyond Phase I:

Understanding the Sample Results

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

Definitions of the information provided in the sampling results tables:

  • Population Served: The number of individuals served by the water supply.
  • 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 PFAS Questions Page.

For support in communicating results to your customers, please visit our Toolkit for documents to assist in your outreach.

Statewide Sampling Initiatve Testing Results

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

Public Water Supplies 
Public Water Supplies screen shot

Schools, Child Care Providers, and Michigan Head Start Programs
Schools on Their Own Well dataset screen shot

Public Water Supply Testing Results Prior to Statewide Sampling Initiative
Public Water Supply Testing Results screenshot