Less precipitation means less pollution is running into the Big Sioux River, according to a 2023 water quality report. “You can see a pretty strong correlation between the amount of rainfall and water quality,” Friends of the Big Sioux River’s Emily Oyos said. “A very direct correlation.”

“We had a significantly less amount of rain than 2022, and that has resulted in better numbers,” said Rachel Kloos, with Friends of the Big Sioux River. Otherwise, the results reveal many of the same problems as in past years. Continue reading Less rain results in a cleaner Big Sioux River, report says