April 13, 2026
UNDATED (S.D. Searchlight)—-The highest concentrations of “forever chemicals” in the Big Sioux River are in Sioux Falls and just south of Watertown, according to a report from South Dakota Mines.
The study, conducted by East Dakota Water Development District and researchers at the school, tested water for per- and polyfluoroalkyl substances (PFAS) at 13 sites from northeast South Dakota to the Iowa border between September 2024 and the end of 2025…