The City of Joliet, the third largest city in Illinois, serves a population of approximately 150,000. Joliet’s existing water source, the deep groundwater aquifer, will not be able to meet the city’s maximum day water demands (estimated at 30 MGD) by the year 2030. Therefore, Joliet went in search of a cost‐effective, sustainable alternative water source for the City of Joliet and, possibly, the region. Joliet began Alternate Water Supply Source Study in July 2018, beginning with fourteen water source alternatives covering the full range of possible water sources from groundwater, rivers, and Lake Michigan. The first phase was completed in January 2019 and recommended four alternatives for further evaluation in 2019 as feasible alternative water sources. In January 2020, the City Council selected Lake Michigan Water as the City’s new water source. The City Council elected to move forward with further evaluation of two Lake Michigan alternatives in 2020: Lake Michigan – Chicago Department of Water Management: Purchasing treated Lake Michigan Water from the Chicago and building the necessary infrastructure to pump and transmit treated drinking water approximately 30 miles from Chicago to Joliet ($550 million construction cost for Joliet alone); Lake Michigan – New Indiana Intake: Constructing a new raw water intake in Lake Michigan along the Indiana shoreline as well as pumping facilities and transmission mains to bring raw water approximately 47 miles to the Joliet for surface water treatment and distribution ($900 million construction cost for Joliet alone). The 2020 Evaluation is focused on refining the two alternatives and providing updated costs to the City Council to allow for a final decision on the alternative water source by the end of 2020, after which the program will proceed into Preliminary Design in 2021. Final Design is anticipated between 2022 and 2024, with a 5-year construction timeframe anticipated between 2025 and 2030.
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Allison Swisher;Theresa O’Grady
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