Massachusetts: PFAS Drinking Water Standard (MCL) Development

June 20, 2019

MassDEP is in the process of establishing a drinking water standard, known as a Maximum Contaminant Level (MCL), for PFAS of 20 ppt (applicable to the SUM of concentrations for PFDA, PFHpA, PFHxS, PFNA, PFOS & PFOA).

On June 12, 2018 MassDEP Office of Research and Standards adopted a Guideline for Drinking Water of  70 ppt for PFOS, PFOA, plus PFHxS, PFHpA, PFNA. This guidline: 

  • Relied on EPA Health Advisory value of 70 ppt for PFOS and PFOA
  • Extended to very closely related compounds that have less extensive data
  • Based on similarities in chemical structures; half lives; toxicity
    • Approach also used by CT; VT
    • Reviewed and unanimously endorsed by Health Effects Advisory Committee

Written comments are due by COB on July 19, 2019

  • By email to:
    [email protected] 
  • By mail to:
    Elizabeth Callahan
    One Winter Street Boston, MA 02108

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