Metropolitan St. Louis Sewer District

About MSD

How The Metropolitan St. Louis Sewer District Was Formed

The Metropolitan St. Louis Sewer District (MSD) was formed on February 9, 1954, when voters approved the Plan of the District to provide a metropolitan-wide system of wastewater treatment and sanitary sewerage facilities for the collection, treatment and disposal of sewage. MSD began operations in January 1956 in an area roughly composed of the City of St. Louis and the portion of St. Louis County located east of Interstate 270. It took over the publicly-owned wastewater and stormwater drainage facilities within its jurisdiction and began the construction of an extensive system of collector and interceptor sewers and treatment facilities. Most of the remainder of St. Louis County was annexed by MSD in 1977.

The System

MSD's service area now encompasses approximately 525 square miles, including all 62 square miles of the City and 462 square miles (approximately 90%) of the County. The current population served by MSD is approximately 1.3 million.

MSD owns and operates the System, which consists of sanitary, stormwater and combined collection sewers, pumping stations, and wastewater treatment facilities in its service area. MSD provides sewer collection, pumping and treatment services within three major watersheds located within the MSD's service area including the Mississippi River watershed, the Missouri River watershed and the Meramec River watershed. In addition, MSD provides a variety of other services, including sanitary sewer maintenance, stormwater sewer maintenance, floodwater control, monitoring of industrial waste, issuance of pretreatment discharge permits, engineering design and specification, construction of sewer lines, plan review and approvals, issuance of connection permits, public education and customer service.

Collection and Trunk Sewers and Force Mains

As of October 16, 2013, MSD owns and maintains 9,578 miles of collection and trunk sewers and force mains, ranging in size from six inches to 29 feet in diameter. Sewers maintained by MSD range in age from less than a year old to more than 150 years old. Approximately, 524 miles are more than 80 years old and 311 miles are more than 120 years old. They are classified as one of three types: sanitary, storm or combined. Sanitary sewers accommodate household and industrial waste. Storm sewers carry rainwater and surface water runoff. Combined sewers carry both types of waste. The System currently includes approximately 4,744 miles of sanitary sewers and force mains, approximately 3,028 miles of stormwater sewers and force mains, and approximately 1,806 miles of combined sewers that handle both wastewater and stormwater flows. Maintenance of the System is controlled and conducted out of three regional facilities.

Pumping Stations and Force Mains

MSD owns and maintains 278 pumping stations and 116 miles of force mains (which are included in the sewer system totals above). Pump station and force main support is divided into three geographic regions under a pump station manager. All pump stations are maintained regularly and monitored continuously. Of the 278 stations, 37 are floodwall, overflow regulation, and wet weather relief tank stations, five are stormwater and the remaining 236 are sanitary and combined sewage pump stations which move the flow of wastewater through the wastewater system and into treatment plants.

Wastewater Treatment Facilities

MSD currently owns and operates seven wastewater treatment facilities. These facilities treated an average flow of 356 million gallons of wastewater per day ("MGD") from 2009 to 2012. The Bissell Point and Lemay wastewater treatment plants are the District's two largest plants. Both of these plants serve the Mississippi River watershed. The Coldwater Creek and Missouri River wastewater treatment plants service the Missouri River watershed. The remaining wastewater treatment plants serve the Meramec River watershed.

Please use the links to access information for each section. 

What's Going on at MSD - calendar, news items

Organization - Board of Trustees, Rate Commission, Management

Charter - MSD's operating plan

Fiscal - annual report, budget, CIRP budget, debt management, investment policy, pension, deferred compensation, portfolio report

Diversity Information - vendor form, supplier diversity

Ordinances and Resolutions - laws, opinions, search