🇺🇸 USA Apr 12, 2026 · Makenzie Huber

Water district plans more testing, considers treatment of ‘forever chemicals’ in Big Sioux River

South Dakota Searchlight
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Water district plans more testing, considers treatment of ‘forever chemicals’ in Big Sioux River
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Jenny Kozak, a master’s student at South Dakota Mines, draws a sample of Big Sioux River water on Sept. 26 at Falls Park in Sioux Falls. (Makenzie Huber/South Dakota 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)

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