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

By: Makenzie Huber

Outlets: South Dakota Searchlight

Published: April 12, 2026

Words: 698

Last Updated: 3 months, 2 weeks ago

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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.

The chemicals have been used …

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