This information can also be found on Michigan.gov/MiLeadSafe, under the Water Supply Lead Results page.

A building's plumbing system and water service line (pipes) can be made up of different types of materials. Each type of material can affect drinking water differently, so it is useful to conduct what is known as "sequential sampling". Sequential sampling is where all water usage in a building is stopped for several hours, known as "stagnation". Next, water is collected from the faucet in a series of bottles. This is done without wasting any water or running the water before filling the bottles. The first few bottles represent water that was in contact with the faucet or building plumbing during stagnation. The later bottles represent water that was in contact with the water service line. These sample results can help decide whether treatment is working.

Learn more at Michigan.gov/FlintWater

The second quarter for PFAS MCL compliance monitoring ran from April 1 - June 30, 2021, and included two groups of supplies:

Those supplies whose initial round monitoring returned a PFAS detection(s) for one of the analytes with an MCLs, placing them onto a quarterly monitoring schedule.
A number of those supplies which have demonstrated through sampling PFAS levels consistently and reliably below the PFAS MCLs, who are on an annual monitoring schedule. (Who opted to collect their annual sample during Quarter 1)

Visit Michigan.gov/PFASresponse for more information.

For questions on this dataset, please contact EGLE-PFAS-DrinkingWater@Michigan.gov

*Not including those Quarter 1 samples collected during the initial round of compliance monitoring (August 3, 2020 - February 3, 2021)

The full first quarter for PFAS MCL compliance monitoring ran from January 1 - March 31, 2021, and included two groups of supplies:

Those supplies whose initial round monitoring returned a PFAS detection(s) for one of the analytes with an MCLs, placing them onto a quarterly monitoring schedule.
A number of those supplies which have demonstrated through sampling PFAS levels consistently and reliably below the PFAS MCLs, who are on an annual monitoring schedule. (Who opted to collect their annual sample during Quarter 1*).

Visit Michigan.gov/PFASresponse for more information.

For questions on this dataset, please contact EGLE-PFAS-DrinkingWater@Michigan.gov

The initial compliance monitoring period ran from the date of MCL promulgation (August 3, 2020) until February 3, 2021, and included two groups of supplies:

Those supplies which had collected a sample during EGLE's statewide PFAS survey and returned a PFAS result with a detection greater than half of one of the proposed MCLs AND those supplies which had not previously collected a PFAS sample during EGLE's statewide PFAS survey, would sample during the first full quarter following promulgation (October 1, 2020 - December 31, 2020).

All remaining supplies which had collected a sample during EGLE's statewide PFAS survey would sample during the first six months following promulgation (August 3, 2020 - February 3, 2021).

Visit Michigan.gov/PFASresponse for more information.

For questions on this dataset, please contact EGLE-PFAS-DrinkingWater@Michigan.gov

This dataset was created and is maintained by the Office of the Clean Water Public Advocate, within the Michigan Department of Environment, Great Lakes, and Energy (EGLE).

For questions on this dataset, please contact EGLE-CleanWater@Michigan.gov

This dataset shows testing results from the statewide sampling initiative for Michigan public water supplies conducted in 2018. Additional results from the testing will be added as they become available.

Visit Michigan.gov/PFASresponse for more information.

For questions on this dataset, please contact EGLE-PFAS-DrinkingWater@Michigan.gov

This dataset shows testing results from the statewide sampling initiative for Michigan schools on their own private well. Additional results from the school testing will be added as they become available.

If a school is not listed, it may be serviced by municipal water. If you are not sure where a school gets its drinking water, contact a school administrator. If a school is on municipal water, EGLE tested all of Michigan's municipal supplies in 2018 as part of Phase I.

Visit Michigan.gov/PFASresponse for more information.

For questions on this dataset, please contact EGLE-PFAS-DrinkingWater@Michigan.gov

The next phase of statewide PFAS surveillance testing was slated to begin in May 2019 and run through October 2019. This effort sampled non-community public water supplies which were not part of Phase I, to assess the potential for PFAS impact in drinking water for expanded at-risk populations. Testing was conducted for non-community supplies utilizing their own well or wells.

In March 2019, the Michigan Department of Environment, Great Lakes, and Energy (EGLE) began quarterly sampling of Public Water Supplies sampled during Phase I which had Total Tested PFAS levels of at least 10 ppt but did not exceed the USEPA LHA (70 ppt PFOS+PFOA). This sampling will be done for one year (four quarters) and will help determine if there are seasonal changes in PFAS levels for these 61 supplies, to help prioritize and direct next steps.

Two systems which had Total Tested PFAS levels of at least 10 ppt but did not exceed the USEPA LHA (70 ppt PFOS+PFOA) use surface water as a source (Ann Arbor and Sims-Whitney Utilities Authority), and will be sampled as part of the Monthly PFAS Monitoring Program for Michigan’s Surface Water Supplies, including the Great Lakes.

Visit Michigan.gov/PFASresponse for more information.

For questions on this dataset, please contact EGLE-PFAS-DrinkingWater@Michigan.gov