Any more rainfall and Mayor Mike Huether said Sioux Falls would've had a bigger problem.
"I do want the people of Sioux Falls know we dodged a major bullet last night," Huether said. "Our wastewater treatment plant has never ever worked as hard as it did last night, and is currently working now."
As lift stations try to catch up, Huether wants homeowners stop dumping water from their sump pumps down the drain.
"If you're doing it, stop it now! Stop it now!" Huether said.
According to Public Works Director Mark Cotter, more than 57 million gallons of water flowed through the treatment plant Monday night. On a typical day, it only deals with about 16 million gallons.
"It doesn't take many sump pumps to overwhelm an eight-inch line," Cotter said.
Hoping to provide some relief to stressed machinery, workers are putting excess water into basins and lagoons.
"They're essentially like large bathtubs, as well. We can move flow temporarily into them -- allow the rest of the system to catch up," Cotter said.
With the ground saturated with moisture, there is not many places the water can go. Cotter said the city had two areas with sewer backups during the storm. As we gear up for another round of rain, city leaders say they need your help.
"I'm not trying to be mean. I'm not trying to be controlling. I'm asking for your help. Enough is enough. Quit dumping your sump pump water into the floor drains! It's not rocket science!" Huether said.