65 ILCS 5/11-141-14
Notice of the public hearing shall be sent by mail to the persons who paid the general taxes for the last preceding year on each lot, block, tract, or parcel of land within the boundaries of the locality to be served by the proposed project and also to each occupant of premises within the locality. Notice shall also be published at least once, the first publication being not more than 30 nor less than 15 days before the date set for the hearing, in one or more newspapers published in the municipality, or, if no newspaper is published therein, then in one or more newspapers with a general circulation within the municipality. In municipalities with less than 500 population in which no newspaper is published, publication may instead be made by posting a notice in 3 prominent places within the municipality. The notice shall state (1) the time and place of the hearing, (2) the intention of the corporate authorities to construct or acquire the system or to extend or improve the existing system, (3) a description of the project to be constructed or acquired and the boundaries of the locality to be served thereby, (4) the estimated cost of the project, and (5) the probable rates to be charged the users of the system or improvement or extension.
65 ILCS 5/11-141-14