Core Insights - A research team from Kyoto University has found organic fluorinated compounds (PFAS) in all samples taken from 34 sewage treatment plants across Japan, raising health concerns [1] Group 1: Research Findings - The study involved random sampling from approximately 2,200 sewage treatment plants, with 34 selected based on size, treatment method, and regional distribution [1] - Samples of dewatered sludge were collected in 2023 from various locations, including Hokkaido, Kyushu, and Okinawa [1] - PFOS, a representative substance of PFAS, was detected in nearly all samples, with a median concentration of 5.1 nanograms per gram and a maximum value of 69 nanograms [1] Group 2: Health Implications - PFAS are a collective term for thousands of chemical substances that are difficult to degrade and accumulate in the human body and environment, often referred to as "forever chemicals" [1] - The U.S. Centers for Disease Control and Prevention (CDC) has indicated that these substances may lead to various health issues, including kidney cancer, testicular cancer, and elevated cholesterol levels [1]