Metropolitan St. Louis Sewer District

About us

The Metropolitan St. Louis Sewer District was created on February 9, 1954 when voters approved a plan to combine 79 regional sewer districts into one city-wide system for the collection, treatment and disposal of wastewater. But our roots go back much earlier. Some of the earliest sewer pipes in the St. Louis region were built in the 1850s.

In 2012, MSD launched Project Clear in response to a consent decree agreement between MSD, the Environmental Protection Agency, and the Missouri Coalition for the Environment. MSD Project Clear is investing billions of dollars over a generation to improve water quality and minimize wastewater and stormwater issues by monitoring regulatory compliance, planning, designing, and building community rainscaping, system improvements, and performing an ambitious program of maintenance and repair.

Originally serving the City of St. Louis and St. Louis County east of I-270, MSD annexed most of the remainder of St. Louis County in 1977. Today, MSD Project Clear serves approximately 1.3 million people over 520 square miles and five major watersheds in the land bordered by Highway 109 on the west to the Mississippi, Missouri, and Meramac Rivers. Our current system consists of wastewater, stormwater and combined collection sewers, pumping stations, and wastewater treatment facilities.