The United States Environmental Protection Agency has issued draft regulations that will set maximum contaminant levels (MCLs) for a series of PFAS compounds. Proposed MCLs for PFOA and PFOS are both set at 4 parts per trillion (ppt) which are quite a bit lower than MassDEP requirements. A hazard index will be used to regulate 4 additional chemicals - PFNA, PFHxS, PFBS and HFPO-DA. Test results for all of these compounds are available at https://www.topsfieldpublicworks.org/apps/watertesting/. The draft regulations also include Maximum Contaminant Level Goals of zero ppt for PFOS and PFOA. Ultimately EPA doesn't want to have any PFOS or PFOA in drinking water but there are limitations that prevent this including testing accuracy, removal effectiveness and economics. These considerations are why the proposed MCL is 4 ppt.