Massachusetts Adopts Summing Approach in Final Drinking Water Standards for PFAS

The Massachusetts Department of Environmental Protection (MassDEP) is preparing to publish final Maximum Contaminant Levels (MCL) for the sum of six per- and polyfluoroalkyl substances (PFAS). The final rule, set to publish Oct. 2, 2020, will apply to all public water systems and require sampling, reporting, and corrective action when sampling detects PFAS exceedances.