Perfluorooctanesulfonic Acid (PFOS)
Perfluorooctanesulfonic acid,or PFOS, is a poly/perfluoroalkyl substance similar to PFOA. The main ingredient in Scotchgard, this substance has been associated with increased risk of chronic kidney disease in the general US population. Like it’s sister-compound PFOA, PFOS is persistent and does not break down over time in the environment. Therefore, it continues to leach into the water supply.
Learn more about PFOS here.