70 ILCS 2405/16.4
Any ordinance adopted pursuant to the preceding Section shall be published in a newspaper published and having a general circulation in the district undertaking the project or, if there is no such newspaper, it shall be posted in at least 3 of the most public places in the district. The publication or posting of the ordinance shall be accompanied by a notice of (1) the specific number of voters required to sign a petition requesting that the question of acquiring, constructing, purchasing, improving or extending the waterworks, and the issuance of revenue bonds to be submitted to the electors; (2) the time in which such petition must be filed; and (3) the date of the prospective referendum. The clerk of the district shall provide a petition form to any individual requesting one.
If no petition for an election is filed with the Clerk of the district within 30 days after such publication or posting, then, at the expiration of 30 days, the ordinance shall be in effect. If, however, within the period of 30 days a petition is filed with the clerk, signed by voters of the district numbering 10% or more of the registered voters within the district, asking that the question of acquiring, constructing, purchasing, improving or extending the waterworks, and the issuance of revenue bonds therefor, as provided in the ordinance, be submitted to the electors of the district, the trustees shall certify such question to the proper election officials, who shall submit the question at an election in accordance with the general election law to decide whether the project and issuance of bonds of the district, as set forth in the ordinance, should be approved.
If it appears that a majority of the votes cast on the question are in favor thereof, the ordinance takes effect. But if a majority of the votes cast on the question are unfavorable, the trustees shall proceed no further and the ordinance does not take effect.
70 ILCS 2405/16.4