70 ILCS 3010/4
After this ordinance has been adopted, it shall be published once in a newspaper published and having a general circulation in the sanitary district, or if there is no such newspaper, it shall be posted in at least 3 of the most public places in the sanitary district.
If the ordinance specifies that the sanitary district has been directed by an order issued under the provisions of "An Act to establish a Sanitary Water Board and to control, prevent, and abate pollution of the streams, lakes, ponds, and other surface and underground waters in the State, and to repeal an Act named therein", approved July 12, 1951, as heretofore or hereafter amended, and the Environmental Protection Act, to abate its discharge of untreated or inadequately treated sewage, the ordinance authorizing the issuance of those revenue bonds shall be in effect immediately upon its adoption and publication, or posting, as provided in this section, notwithstanding any provision in this Act or any other law to the contrary.
In all other cases, if no petition is filed with the clerk of the sanitary district, as hereinafter provided in this section, within 30 days after the publication or posting of the ordinance, which must include a notice of (1) the specific number of voters required to sign a petition requesting that the question of the adoption of the ordinance to be submitted to the electors; (2) the time in which such petition must be filed; and (3) the date of prospective referendum, the ordinance shall be in effect after the expiration of that 30 day period. But if within that 30 day period a petition is filed with the clerk of that sanitary district signed by voters of the district numbering 10% or more of the registered voters of the sanitary district, asking that the question of improving or extending or of constructing or acquiring and improving and extending a sewerage system and of issuing revenue bonds to pay the cost thereof be submitted to the legal voters of the sanitary district the board of trustees of the sanitary district shall cause submission of the question at the next regular election in accordance with the general election law. The clerk of the sanitary district shall provide a petition form to any individual requesting one.
If it appears upon the canvass of the election that a majority of the legal voters voting upon the question voted in favor thereof, the ordinance shall be in effect, but if a majority of the legal voters voting upon the question are not in favor thereof, the ordinance shall not take effect.
70 ILCS 3010/4