In 2011 the Metropolitan St. Louis Sewer District (MSD) commissioned a disparity study because it is undertaking one of the largest construction projects in the St. Louis region. MSD’s Capital Improvement and Replacement Plan (CIRP) is a $4.7 billion program to update and rehabilitate the district’s wastewater collection and treatment system. This multi-decade program will reduce community health and safety risks with the removal of nearly 400 sewer overflows, which release untreated wastewater into the waterways. The rehabilitation of interceptors, pump stations, and force mains for the seven wastewater treatment plants in MSD’s 100-year-old sewer system are also part of the plan. A project of this scale and magnitude will create long-term economic and employment benefits within the region. To review the Disparity Study please click the links below.