SHAFTSBURY — Two recent developments have emerged — one regulatory and one potentially legal — in the discovery of more homeowners with PFAS-contaminated wells.

An information-gathering effort has launched to prepare for a possible future lawsuit against Saint-Gobain. On the state level, a rule change is in the works to reduce the level of acceptable PFAS in groundwater from 20 parts per trillion to 4 parts per trillion.

PFAS, per- and polyfluoroalkyl substances, are a class of chemicals estimated to be around 14,000 distinct chemicals.

A ChemFab factory in North Bennington and an earlier Bennington plant on Northside Drive were identified by the state as the source of the contamination, which came from the factory exhaust stacks during fabric coating operations using liquid Teflon, con

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