The locations that have been sampled in this effort include Community Water Supplies (including regional and municipal water supplies, manufactured housing communities, residential apartment buildings, etc.), and Nontransient Noncommunity Water Supplies (including schools, businesses, childcare providers, Michigan Head Start locations, etc.)

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.

Definitions of the information provided in the sampling results table:

• SystemName: Water supply system name

• WSSN: Water Supply Serial Number; unique identifier for each public water supply.

• SampleDate: The date samples were taken at the water supply.

• PFAS analytes are listed in individual columns (ppt). These include the 18 PFAS compounds tested under EPA method 537.1. If the result listed is "ND" the lab did not detect, or find, that PFAS was in the water sample above the method reporting limit.

  • HFPO-DA (Hexafluoropropylene oxide-dimer acid, also referred to as "GenX") is a regulated analyte in Michigan with an MCL = 370 ppt

  • PFBS (Perfluorobutane sulfonic acid) is a regulated analyte in Michigan with an MCL = 420 ppt

  • PFHxA (perfluorohexanoic acid) is a regulated analyte in Michigan with an MCL = 400,000 ppt

  • PFHxS (perfluorohexane sulfonic acid) is a regulated analyte in Michigan with an MCL = 51 ppt

  • PFNA (perfluorononanoic acid) is a regulated analyte in Michigan with an MCL = 6 ppt

  • PFOA (perfluorooctanoic acid) is a regulated analyte in Michigan with an MCL = 8 ppt

  • PFOS (perfluorooctane sulfonic acid) is a regulated analyte in Michigan with an MCL = 16 ppt

  • 11Cl-PF3OUdS (11-chloroeicosafluoro-3-oxaundecane-1-sulfonic Acid) is currently a non-regulated analyte in Michigan

  • 9Cl-PF3ONS (9-chlorohexadecafluoro-3-oxanone-1-sulfonic acid) is currently a non-regulated analyte in Michigan

  • ADONA (4,8-dioxa-3H-perfluorononanoic acid) is currently a non-regulated analyte in Michigan

  • FOSA (Perfluorooctanesulfonamide acid) is currently a non-regulated analyte in Michigan

  • 4:2FTS (4:2 Fluorotelomer sulfonic acid) is currently a non-regulated analyte in Michigan

  • 6:2FTS (6:2 Fluorotelomer sulfonic acid) is currently a non-regulated analyte in Michigan

  • 8:2FTS (8:2 Fluorotelomer sulfonic acid) is currently a non-regulated analyte in Michigan

  • NEtFOSAA (2-(N-ethylperfluorooctanesulfonamido) acetic acid) is currently a non-regulated analyte in Michigan

  • NMeFOSAA (2-(N-methylperfluorooctanesulfonamido) acetic acid) is currently a non-regulated analyte in Michigan

  • PFBA (Perfluorobutanoic acid) is currently a non-regulated analyte in Michigan

  • PFDA (perfluorodecanoic acid) is currently a non-regulated analyte in Michigan

  • PFDoA (perfluorododecanoic acid) is currently a non-regulated analyte in Michigan

  • PFDS (Perfluorodecanesulfonic acid) is currently a non-regulated analyte in Michigan

  • PFHpA (perfluoroheptanoic acid) is currently a non-regulated analyte in Michigan

  • PFHpS (Perfluoroheptanesulfonic acid) is currently a non-regulated analyte in Michigan

  • PFNS (Perfluorononanesulfonic acid) is currently a non-regulated analyte in Michigan

  • PFPeA (Perfluoropentanoic acid) is currently a non-regulated analyte in Michigan

  • PFPeS (Perfluoropentanesulfonic acid) is currently a non-regulated analyte in Michigan

  • PFTeDA (perfluorotetradecanoic acid) is currently a non-regulated analyte in Michigan

  • PFTrDA (perfluorotridecanoic acid) is currently a non-regulated analyte in Michigan

  • PFUnA (perfluoroundecanoic acid) is currently a non-regulated analyte in Michigan

• SysSampleCode: The identification number that corresponds to the sample taken.

• LabName: Laboratory providing PFAS analysis via EPA method 537.1.

• LocName: Specific sample location, when applicable

• LabNumber: The certified lab code number. Note: LabName indicated values may vary for the same lab (issue with data coming from two different databases). LabNumber will help clarify these cases.

The data represents the PFAS sample locations, with each location having multiple samples taken, dates for each sample, and the analytical results for each sample. These analytical results include detections for 14 – 28 PFAS analytes, depending on the analytical method used.

Questions regarding the drinking water sampling PFAS data can be directed to EGLE-PFAS-DrinkingWater@michigan.gov.