PFAS are present in the serum of 95% of Americans; therefore, it is important to determine PFAS sources in the environment and other possible sources of PFAS exposure to humans . PFAS are detected in various environmental media, including drinking water , groundwater , surface water , wastewater treatment plants (WWTP) , soils , and air . PFAS sources in the environment are associated with various sites, and unknown point sources around those sites .