415 ILCS 5/13.8

No person shall be required to obtain a permit from the Agency to apply a commercially available algicide, such as copper sulfate or a copper sulfate solution, in accordance with the instructions of its manufacturer, to a body of water that: (i) is located wholly on private property, (ii) is not a water of the United States for purposes of the Federal Water Pollution Control Act, and (iii) is not used as a community water supply source.