Site work for a water / sewer project in Wilmette, Illinois. Design plans call for site work for a water / sewer project.

Sewer lining is a non-invasive technique to rehabilitate sewers by eliminating infiltration, structural defects, and root intrusion. The list of sewers identified as needing sewer lining grows each year. This biennial expenditure is proposed to be a long-term program to address the deterioration of the Village's sewer system. The goal of the lining program is both to increase the structural integrity of the lines to avoid collapse and to reduce the amount of infiltration and inflow (I/I) into the sewer systems. Both lining along with grouting the sewer service connections at the main have been shown to have a more significant effect on the reduction of I/I than with sewer lining alone. The net effect will also be an increase in sanitary sewer conveyance capacity and a reduction in the number of potential basement back-ups and sanitary sewer overflows because excess clean water is kept out of the sanitary sewer system. Without addressing the lateral sewer connections at the main, I/I removed by lining can migrate through the interstitial space between the liner and host pipe and reenter the main at the connections. By the end of 2024, approximately 62% of the separate sanitary sewer system will be lined. Approximately 18 miles of unlined sanitary sewers will remain. In the combined sewer system, approximately 25% of the sewers will be lined by the end of 2024, with approximately 40 miles remaining. More sewers have been lined on the west side of the Village because the focus has been on areas that experienced basement backups and sewer surcharging. I/I removal is less beneficial in the combined system because it is designed to carry Stormwater in addition to sanitary flows. In more recent years, the west side has also been the focus to comply with the MWRD Infiltration / Inflow Control Program (I/ICP) requirements. The goal of the program is to remove clean sources of water from the sanitary system. As of March 11, 2024, this project is included in the city’s 2024-2033 Capital Improvement Program (CIP). Per owner, designs are prepared by Village staff; construction is tentatively scheduled for Fall 2024. *Project information has been obtained through a public capital improvement plan (CIP). A CIP is a financial schedule for short- and long-range projects which is updated regularly. Information listed in the CIP often evolves based on funding availability and the project details, including timeline and value, are subject to change. The content management team will continue to pursue additional details as they become available.