PFAS Information

PFAS DiagramPFAS are fluorinated organic chemicals. Two PFAS chemicals, perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) were extensively produced and are the most studied and regulated of these chemicals. Several other PFAS that are similar to PFOS and PFOA exist. These PFAS are contained in some firefighting foams used to extinguish oil and gas fires. They have also been used in a number of industrial processes and to make carpets, clothing, fabrics for furniture, paper packaging for food and other materials (e.g., cookware) that are resistant to water, grease and stains. Because these chemicals have been used in many consumer products, most people have been exposed to them.

While consumer products and food are the largest source of exposure to these chemicals for most people, drinking water can be an additional source of exposure in communities where these chemicals have contaminated water supplies. Such contamination is typically localized and associated with a specific facility, for example, an airfield at which they were used for firefighting or a facility where these chemicals were produced or used.

All wells in Mansfield test results are below 20ppt, the current updated Office of Research and Standards Guidelines (ORSG) for drinking water.  Mansfield Water Department continues to test the water regularly based on DEP frequency recommendations. 

More information can be found at 

DEP Information on PFAS

If you have a private drinking well, more information about PFAS related to private well drinking water can be found at:

DEP FAQ on PFAS related to Private Well Drinking Water Supples