On Friday, MassDEP proposed a number of revisions to the Massachusetts Contingency Plan, including reporting and cleanup standards for PFAS. 
The proposed GW-1 standard, applicable to current and potential drinking water source areas, would be 20 parts per trillion for the sum of six PFAS compounds (PFDA, PFHpA, PFHxS, PFOA, PFOS, and PFNA) – significantly more stringent than the 70 ppt guideline for the sum of five PFAS compounds currently in effect.… More