"The Endocrine Society appreciates the opportunity to comment on the proposed National Primary Drinking Water Regulation for Per- and Polyfluoroalkyl Substances (PFAS). Founded in 1916, the Endocrine Society is the world’s oldest, largest, and most active organization of scientists and healthcare professionals dedicated to research on hormones and the clinical treatment of patients with endocrine diseases. Our membership includes 18,000 clinicians and scientists from over 120 countries, including many researchers engaged in the study of the adverse effects of per- and polyfluoroalkyl substances (PFAS) on endocrine systems."