This dataset is meant for general information about confirmed PFAS sites in Michigan and is a collection of basic datasets related to those PFAS sites which allow users to identify, query, and filter the data.

For questions about this dataset, please contact EGLE-Maps@Michigan.gov

Public water systems sample for many different water quality indicators, also known as parameters, every day to help ensure the safety of your drinking water. The data shown in the tables below helps the City of Flint make decisions about the best way to treat the water. If more than one sample is collected per day at a particular location, the average or range of all daily samples may be shown.

This table shows water quality data for the GCDC system. The City of Flint will use this data to make treatment decisions when the GCDC is supplying water to the City of Flint. Visit Michigan.gov/FlintWater for more information.

The City of Flint purchases treated water from the Great Lakes Water Authority (GLWA) and the Genesee County Drain Commissioner (GCDC) and provides further treatment to optimize corrosion control.

• Data collected from the City's distribution system helps us know whether the treatment process is working correctly
• Some data in the table is informational only
• Some data shows whether target ranges for pH, orthophosphate, chlorine, and iron are being met.

Other testing that EGLE is doing for the City of Flint is Lead and Copper Sequential Sampling.

The four categories shown on the previous page (pH, Orthophosphate, Iron, and Chlorine) are main indicators of whether the City's corrosion control treatment is working properly. In 2017 EGLE set required ranges for pH and orthophosphate. An expanded dataset is available.

Visit Michigan.gov/FlintWater for more information.

The City of Flint purchases treated water from the Great Lakes Water Authority (GLWA) and the Genesee County Drain Commissioner (GCDC) and provides further treatment to optimize corrosion control.

• Data collected from the City's distribution system helps us know whether the treatment process is working correctly
• Some data in the table is informational only
• Some data shows whether target ranges for pH, orthophosphate, chlorine, and iron are being met.

Other testing that EGLE is doing for the City of Flint is Lead and Copper Sequential Sampling.

This expanded dataset helps the City of Flint make decisions about the best way to treat the water. If more than one sample is collected per day at a particular location, the average or range of all daily samples may be shown.

Visit Michigan.gov/FlintWater for more information.

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

Public water systems sample for many different water quality indicators, also known as parameters, every day to help ensure the safety of your drinking water. The data shown in the tables below helps the City of Flint make decisions about the best way to treat the water. If more than one sample is collected per day at a particular location, the average or range of all daily samples may be shown.

This table shows water quality data for the GLWA water system. The City will use this data to make treatment decisions when the GLWA is supplying water to the City of Flint.

For more information, visit 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