IN THE MATTER OF:WATER QUALITY STANDARDS ANDEFFLUENT LIMITATIONS FOR THECHICAGO AREA WATERWAY SYSTEMAND THE LOWER DES PLAINES RIVER:PROPOSED AMENDMENTS TO 35 Ill.
These permits include monitoring, notification and reporting requirements for combined sewer
overflows, known as CSOs, within the District's Jurisdiction.
CSOs act as relief points when storm water runoff overwhelms the combined sewer
system.
There are 406 CSO points along the waterways within the District's jurisdiction.
In 2005
there was an average of 10.7 CSO outfalls discharging on each day that CSO activity occurred.
Allowed
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