Per-and polyfluoroalkyl substances (PFAS) are a large group of 9000 persistent fluorinated synthetic chemicals that have been used since the 1950's and are detected in the environment and humans globally now . PFAS sources are associated with various potential PFAS "users" that currently use or have used products containing PFAS. For example, fire training areas, airports, the Department of Defence (DOD), and several manufacturing industries are among common users of PFAS .