The regulations would limit the two most common PFAS chemicals PFOA and PFOS to four parts per trillion; and also limit any mixture containing one or more of the PFAS chemicals known as PFNA, PFHxS, PFBS, and/or GenX.
The recommendations vary based on the body of water, the type of fish and the person eating it. The ponds, lakes and reservoirs with new warnings include Walden Pond in Concord and other spots popular for fishing.
Massachusetts' limit on PFAS in drinking water is one of the strictest in the country. Removing the chemicals from drinking water can cost millions, and so far, communities have footed most of the bills. With new regulations expected this year, the costs may get much higher.
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