Building the deep tunnel system did not magically clear up all the issues involved in the sanitary sewer system that treats wastewater, but it cleaned up most of them. Overflows from both sanitary sewers and combined sewers have fallen dramatically, the Milwaukee Metropolitan Sewerage District reports.
Does more need to be done? Yes. Can the district do a better job? Sure. But it won't make much difference if the region doesn't get a handle on the problem created by storm water.
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