In southwestern Vermont, residents of the town of Bennington sued in 2016 after state officials determined that a local company, Saint-Gobain Performance Plastics Corp., discharged the toxic chemical perfluorooctanoic acid, or PFOA, through its smokestacks. Over decades, the chemicals seeped into the groundwater, contaminating the drinking water supply for more than 2,000 property owners.

Last month, in a key ruling, a federal judge refused to toss the claims on summary judgment, and set the case for a July 6 trial.