Chicago's Southwest Side, where working-class and predominantly Latino neighborhoods have endured some of the city's worst flooding for decades, is getting a new underground tunnel connection designed to move stormwater away faster when storms overwhelm the aging sewer system.
The city is seeking a contractor to build the Southwest Pumping Station Tunnel Connection, a project that would link the Southwest Pumping Station into the broader regional drainage network. The pumping station serves as a critical pressure-relief node for neighborhoods including Gage Park, Chicago Lawn, West Lawn, Ashburn and Garfield Ridge, all of them built out in the early 20th century with sewer pipes never sized for today's rainfall or pavement coverage.
The urgency is not abstract. The July 2023 storm caused an estimated $500 million in flood damage across Cook County, triggering a federal disaster declaration and sending thousands of Southwest Side residents into their flooded basements. The 2008 storms left a similar mark. Community advocates and alderpersons from the 12th, 14th, 15th and 22nd wards have spent years pushing for meaningful investment in this drainage basin, pointing to flood equity analyses showing that Black and Latino neighborhoods on the South and West sides absorb a disproportionate share of damage when the system fails.
The project connects to Chicago's obligations under a 2014 federal consent decree requiring the city to reduce combined sewer overflows, the events where stormwater and raw sewage mix and spill into the Chicago River. Federal infrastructure funding from the 2021 Bipartisan Infrastructure Law and EPA revolving loan programs has helped Chicago and other older cities attack a backlog of projects like this one that strained local capital budgets alone could not reach. Similar block-by-block infrastructure work is already underway elsewhere in the city, including lead pipe replacement on the Northwest Side.
Contract value and a construction timeline were not included in the publicly posted solicitation. The city's Department of Water Management will select a contractor through the competitive bid process, with the solicitation posted Nov. 17, 2026.
