On October 2, 2020, MassDEP published final regulations establishing a drinking water standard, or a Maximum Contaminant Level (MCL), for the sum of six per- and polyfluoroalkyl substances (PFAS). The MCL is 20 parts per trillion (ppt) for what the regulations call PFAS6, or the sum of six PFAS compounds: perfluorooctanesulfonic acid (PFOS), perfluorooctanoic acid (PFOA), perfluorohexane sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), perfluoroheptanoic acid (PFHpA), and perfluorodecanoic acid (PFDA).
Additional MassDEP regulations for testing of PFAS in the environment are likely in the future as scientific studies are conducted and the understanding of these chemicals increases. The Town of Nantucket has been and will perform all testing as required by MassDEP. The Town also performed testing as recommended by our professional and licensed consultants to address specific situations.
The Town of Nantucket, Nantucket Memorial Airport and Wannacomet Water Company along with MassDEP are working together to coordinate PFAS related activities.