EPA has directed the Illinois Pollution Control Board to adopt new or revised water quality standards for the North and South Branches of the Chicago River, the North Shore Channel, the Cal-Sag Channel and the Little Calumet River. If the board does not act, the Clean Water Act authorizes U.S. EPA to take what the agency considers to be the necessary actions. Since 2007, U.S. EPA has recommended that Illinois upgrade water quality standards for the waterway system.
In 2009, U.S. EPA made a similar determination under its Clean Water Act authority for a 28-mile portion of the Mississippi River near St. Louis.
[read more about 2009 EPA action in Missouri]
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