PFHxS is a persistent chemical used in firefighting foam and water-resistant products. It contaminates drinking water near industrial sites and military bases, accumulating in the body over time.

PFHxS belongs to the PFAS family of chemicals, known for their water and stain-resistant properties. It's commonly found in firefighting foam and industrial products. Unlike many pollutants, PFHxS doesn't break down easily in the environment or the human body. It can seep into groundwater from contaminated soil, especially near airports, military bases, and manufacturing sites. Detection requires advanced laboratory methods. While research on its health impacts is ongoing, its persistence in the body raises concerns among scientists and health officials.