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PFAS DRINKING WATER GENERIC CLEANUP CRITERIA REVISION
The Michigan Department of Environment, Great Lakes, and Energy (EGLE) promulgated state drinking water standards for the following per- and polyfluoroalkyl substances (PFAS) that are effective August 3, 2020. State drinking water standards are also commonly referenced as maximum contaminant levels and developed under section 5 of the State Drinking Water Act, 1976 PA 299 [MCL 325.1005].
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PFAS
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CAS Registry Number
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State Drinking
Water Standard
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ng/L
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µg/L
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Perfluorooctanoic acid (PFOA)
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335-67-1
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8
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0.008
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Perfluorooctanesulfonic acid (PFOS)
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1763-23-1
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16
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0.016
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Perfluorononanoic acid (PFNA)
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375-95-1
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6
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0.006
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Perfluorohexane sulfonic acid (PFHxS)
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355-46-4
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51
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0.051
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Perfluorohexanoic acid (PFHxA)
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307-24-4
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400,000
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400
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Perfluorobutane sulfonic acid (PFBS)
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375-73-5
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420
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0.420
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Hexafluoropropylene oxide dimer acid (HFPO-DA)
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13252-13-6
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370
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0.370
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EGLE previously developed generic cleanup criteria for groundwater used as drinking water for PFOA and PFOS that were effective January 10, 2018. As established under Part 201, Environmental Remediation, of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended [MCL 324.20120a(5)], the state drinking water standards become the PFOA and PFOS generic cleanup criteria for groundwater used as drinking water.
The state drinking water standards 0.008 µg/L (parts per billion) and 0.016 µg/L, respectively for PFOA and PFOS, are effective August 3, 2020 and replace the previously established residential and nonresidential drinking water criteria of 0.07 µg/L for the combined concentrations of PFOA and PFOS. The generic groundwater criteria table and associated footnote have been revised to reflect the changes for PFOA and PFOS generic cleanup criteria for groundwater used as drinking water. The updated criteria tables and footnote can be found at Michigan.gov/EGLERRD.
The target detection limits (TDL) for PFOA and PFOS are 0.005 µg/L in water.
The remaining established PFAS state drinking water standards do not currently have respective generic cleanup criteria. EGLE must follow the process set forth by statute and rule to establish criteria because there are no criteria currently for these substances. That process will be initiated shortly and announced separately.
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