The Metropolitan St. Louis Sewer District has agreed to spend $4.7 billion to make extensive improvements in its sewer systems and treatment plants over the next 23 years as part of a settlement with the federal government, the State of Missouri, and the Missouri Coalition of the Environment Foundation.
In the settlement announced August 5, MSD will be required to install a variety of pollution controls, including building three large storage tunnels ranging from approximately two miles to nine miles in length, and to expand capacity at two treatment plants.