CONCORD, N.H. (AP) — New Hampshire's Democratic Congressional delegation wants a federal agency to expand its study of contaminated water to a community near a factory believed to have released toxic chemicals into the air and groundwater.

The Agency for Toxic Substances and Disease Register is slated to conduct a nationwide study into the implication of perfluoroalkyl and polyfluoroalkyl, also known as PFAS. They were used in fire-suppressing foam, fast-food wrappers, and stain-resistant fabric, but are no longer used in U.S. manufacturing. Water around military bases, factories and other sites were found contaminated with the chemicals.

In a letter, the delegation called on the agency to expand its services from southern New Hampshire near a former military base to Merrimack, where high levels of PFAS were found in a well near Saint-Gobain Performance Plastics.