225 ILCS 725/11
Whenever it shall appear that any person is violating or threatening to violate any provision of this Act, or any rule or final administrative order made hereunder, the Department, through the Attorney General, who may call to his or her assistance the State's Attorney of the county in which an action is instituted, shall bring an action in the name of the People of the State of Illinois against such person in the circuit court of the county wherein any part of the land or any activity which is the subject matter of such action is located, or a final administrative order was entered, to restrain such person from continuing such violation or from carrying out the threat of violation. In such action the Department, in the name of the People of the State of Illinois, may obtain such injunctions, prohibitory and mandatory, including temporary restraining orders and preliminary injunctions, or other enforcement orders as the facts may warrant.
All remedies and penalties provided for in this Act shall be cumulative in effect and, accordingly, proceedings under this Section are in addition to, and not in lieu of, other remedies and penalties provided for in this Act.
225 ILCS 725/11