The Collection System Process involves collecting wastewater from the homes, businesses, and streets of Madison Metropolitan Sewerage District's (MMSD) service area and delivering it to the Nine Springs Wastewater Treatment Plant.
Any water that is used for washing, flushing, or industrial processing is considered wastewater. Once the water becomes contaminated or is otherwise unfit for human consumption it is considered wastewater. This water is collected through a network of drains, sewer laterals, interceptors, pumping stations, and force mains. The collected wastewater is then fed into the treatment plant for processing.
Each day, MMSD receives and treats about 40 million gallons of wastewater from the Cities of Fitchburg, Madison, Middleton, Monona and Verona; the Villages of Cottage Grove, Dane, DeForest, Maple Bluff, McFarland, Shorewood Hills, Waunakee and Windsor; and from sanitary and utility districts and other areas in the Towns of Blooming Grove, Burke, Dunn, Madison, Middleton, Pleasant Springs, Verona, Vienna and Westport. MMSD also accepts septic tank and other wastes from unsewered areas located primarily in rural Dane County.