The City of Duluth has two types of sewers:

• Storm sewers carry snow melt and rainwater runoff from streets, buildings, lawns and parking lots. This stormwater flows off the streets into catch basins or ditches; then it flows through underground storm sewers and culverts to the nearest creek, stream, river, or Lake Superior. Stormwater runoff is not treated or cleaned before it enters our waterways.
• Sanitary sewers carry wastewater away from our homes and businesses; the water is used in sinks, showers, bath tubs, laundry and toilets. This wastewater flows through the sanitary sewer system to a wastewater treatment facility, where the water is treated (cleaned) before it’s discharged back into the environment.