Chicago's Deep Tunnel was built to prevent sewage and storm runoff from overflowing into Lake Michigan. News reports say 19 billion gallons of bacteria-contaminated runoff flowed into the lake from 2007 to 2010, compared with the 12 billion gallons dumped between 1985 and 2006. The continued degradation of the city's water system has prompted the Environmental Protection Agency to investigate the system's performance.

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