70 ILCS 2305/7
The board of trustees of any sanitary district organized under this Act may provide for the treatment of the sewage thereof and save and preserve the water supplied to the inhabitants of such district from contamination. For that purpose the board may construct and maintain an enclosed conduit or conduits, main pipes, wholly or partially submerged, buried or otherwise, and by means of pumps or otherwise cause such sewage to flow or to be forced through such conduit or conduits, pipe or pipes to and into any ditch or canal constructed and operated by any other sanitary district, after having first acquired the right so to do. Such board may provide for the drainage of such district by laying out, establishing, constructing and maintaining one or more channels, drains, ditches and outlets for carrying off and disposing of the drainage (including the sewage) of such district, together with such adjuncts and additions thereto as may be necessary or proper to cause such channels or outlets to accomplish the end for which they are designed, in a satisfactory manner, including pumps and pumping stations and the operation of the same. Such board shall provide suitable and modernly equipped sewage treatment works or plants for the separation and treatment of all solids and deleterious matter from the liquids, and shall treat and purify the residue of such sewage so that when it flows into any lake, it will not injuriously contaminate the waters thereof. The board shall adopt any feasible method to accomplish the object for which such sanitary district may be created, and may also provide means whereby the sanitary district may reach and procure supplies of water for diluting and flushing purposes. The board of trustees of any sanitary district formed under this Act may also enter into an agreement to sell, convey, or disburse treated wastewater to any public or private entity located within or outside of the boundaries of the sanitary district. Any use of treated wastewater by any public or private entity shall be subject to the orders of the Pollution Control Board. The agreement may not exceed 20 years.
Nothing set forth in this Section may be construed to empower, authorize or require such board of trustees to operate a system of water works for the purpose of furnishing or delivering water to any such municipality or to the inhabitants thereof without payment therefor at such rates as the board may determine. Nothing in this Act shall require a sanitary district to extend service to any individual residence or other building within the district, and it is the intent of the Illinois General Assembly that any construction contemplated by this Section shall be restricted to construction of works and main or interceptor sewers, conduits, channels and similar facilities, but not individual service lines. Nothing in this Act contained authorizes the trustees to flow the sewage of such district into Lake Michigan. Any such plan for sewage disposal by any sanitary district organized hereunder is prohibited, unless such sewage has been treated and purified as provided in this Section, all laws of the Federal government relating to the pollution of navigable waters have been complied with, the approval of plans and constructions of outlets and connection with any of the streams or navigable bodies of water within or bordering upon the State has been obtained from the Department of Natural Resources of the State. The discharge of any sewage from any such district into any of the streams or navigable bodies of water within or bordering upon the State is subject to the orders of the Pollution Control Board. Nothing in this Act contained may be construed as superseding or in any manner limiting the provisions of the Environmental Protection Act.
After the construction of such sewage disposal plant, if the board finds that it will promote the prevention of pollution of waters of the State, such board of trustees may adopt ordinances or rules and regulations, prohibiting or regulating the discharge to sewers of inadmissible wastes or substances toxic to biological wastewater treatment processes. Inadmissible wastes include those which create a fire or explosion hazard in the sewer or treatment works; those which will impair the hydraulic capacity of sewer systems; and those which in any quantity, create a hazard to people, sewer systems, treatment processes, or receiving waters. Substances that may be toxic to wastewater treatment processes include copper, chromium, lead, zinc, arsenic, nickel, barium, cadmium, mercury, selenium, silver, and any poisonous compounds such as cyanide or radioactive wastes which pass through wastewater treatment plants in hazardous concentrations and menace users of the receiving waters. Such ordinances or rules and regulations shall be effective throughout the sanitary district, in the incorporated areas as well as the unincorporated areas and all public sewers therein.
70 ILCS 2305/7