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In this Friday, Feb. 26, 2016 photo, a woman leaves a Tops supermarket with bottled water that is being supplied to residents in Hoosick Falls, N.Y. PFOA, long used in the manufacuring of Teflon pans, Gore-Tex jackets, ski wax, and many other products has turned up in the water in factory towns around the country like Hoosick Falls, impacting drinking water.

People testify before the Environmental Protection Agency and Department of Transporation Wednesday in Pittsburgh on a proposed rule to set weaker vehicle emission standards.

The Horsham Air Guard Station in Bucks County, Pa. where the use of PFAS chemicals in firefighting foam has been linked with contamination of local water supplies.

Advocates say PFAS bills would tighten federal control over chemicals

Legislation aims to improve detection, spur cooperation between federal and state governments
By Jon Hurdle

Little Blue Run coal ash pond, on the Pennsylvania-West Virginia border.

Trump administration rolls back coal ash rules aimed at groundwater protection

States may be able to stop monitoring at some sites, and power plants have more time to close leaking ash ponds.

By Reid Frazier

The Horsham Air Guard Station in Bucks County, Pa. where the use of PFAS chemicals in firefighting foam has been linked with contamination of local water supplies.

How the EPA and the Pentagon downplayed a growing toxic threat

A family of chemicals — known as PFAS and responsible for marvels like Teflon and critical to the safety of American military bases — has now emerged as a far greater menace than previously disclosed.

By Abrahm Lustgarten, ProPublica