70 ILCS 3010/14
The board of trustees of any sanitary district intending to avail itself of the provisions of sections 13 to 19, inclusive, of this Act, shall adopt a resolution declaring its intention to construct or acquire a sewerage system for a particular locality within the sanitary district, or its intention to make an extension or improvement to an existing sewerage system for a particular locality, and describing the project to be constructed and the boundaries of the locality to be served thereby. The board of trustees shall also determine the estimated cost of the project, approve a report of the engineer for the sanitary district of the possible rates to be charged to users of the sewerage system or improvement or extension, and set a date for a public hearing on the question of whether or not the project should be constructed.
70 ILCS 3010/14