The City Wastewater Utility built a new secondary biological treatment plant in 1992. All wastewater is collected and pumped to the treatment plant. After treatment and disinfection by Ultra Violet light, the clean water is discharged back to Lake Superior.
Designed peak flow is 2,667 gallons per minute or 3.84 million gallons per day. Annual average flow is approximately 1.1 million gallons per day.
Membrane Water Treatment Plant
The City Water Utility built a new membrane water treatment plant in 2001. The water infrastructure consists of: