Authorities are trying to explain how wastewater made its way into a southeastern Minnesota river.
Wastewater was pumped into the Zumbro River, 30 miles before it flows into the Mississippi, north of La Crosse.
People are upset not only for the pumping, but also the lack of public notification.
When reached for comment, officials with Minnesota Pollution Control Agency confirmed dumping is illegal, but says it’s necessary to unload waste when water gets too high.
In Minnesota, only the local treatment plant makes the decision if public notifications need to go out.
So far this year, 94 communities across Minnesota have released waste water.