CONCORD, N.H. (AP) — New Hampshire is recommending all fire departments in the state test their drinking water for a toxic chemical linked to cancer after it turned up at several facilities.

The chemical was used in industrial coatings, such as Teflon, and is part of a class of chemicals known as perfluorinated chemicals or PFCs. It was also used in firefighting foam, leading to contaminated groundwater at scores of Air Force bases around the country.

In New Hampshire, it was detected above state standards at 222 sites, including six out of seven fire departments.

If additional departments find their water exceeds the standard of 70 parts per trillion, the department should report it the state New Hampshire Department of Environmental within 60 days and a correction action plan may be required.