Section 70 ILCS 2305/20 - Power to prevent pollution of water supply(a) The board of trustees of any such sanitary district shall have power and authority to prevent the pollution of any waters from which a water supply may be obtained by any city, town or village within said district, and shall have the right and power to appoint and support a sufficient police force, the members of which may have and exercise police powers over the territory within such drainage district, and over the waters from which said water supply may be obtained, for a distance of three miles from the shore thereof, for the purpose of preventing the pollution of said waters, and any interference with any of the property of such drainage district; but such police officers when acting within the limits of any such city, town or village, shall act in aid of the regular police force thereof, and shall then be subject to the direction of its chief of police, city or village marshals or other head thereof: Provided, that in so doing they shall not be prevented or hindered from executing the orders and authority of said board of trustees of such drainage district: Provided, further, that before compelling a change in any method of disposal of sewage so as to prevent the said pollution of any water, the board of trustees of such district shall first provide some other method of sewage treatment .(b) The board of trustees of any sanitary district organized under this Act is authorized to apply to the circuit court for injunctive relief or mandamus when, in the opinion of the board of trustees, such relief is necessary to prevent the pollution of any waters from which a water supply may be obtained by any municipality within the district.(c) The sanitary district shall have the power and authority to prevent the pollution of any waters from which a water supply may be obtained by any city, town or village. The sanitary district, acting through the chief administrative officer of such sanitary district, shall have the power to commence an action or proceeding in the circuit court in and for the county in which the district is located for the purpose of having the pollution stopped and prevented either by mandamus or injunction. The court shall specify a time, not exceeding 20 days after the service of the copy of the petition, in which the party complained of must answer the petition, and in the meantime, the party be restrained. In case of default in answer or after answer, the court shall immediately inquire into the facts and circumstances of the case and enter an appropriate order in respect to the matters complained of. An appeal may be taken in the same manner and with the same effect as appeals are taken in other actions for mandamus or injunction.Amended by P.A. 098-0162,§ 5, eff. 8/2/2013.