70 ILCS 1837/165
At least 5% of the legal voters resident within the limits of the proposed addition to the District may petition the circuit court for the county in which the major part of the District is situated, to cause the question to be submitted to the legal voters of the proposed additional territory, whether the proposed additional territory shall become a part of the District and assume a proportionate share of the general obligation bonded indebtedness, if any, of the District. The petition shall be addressed to the court and shall contain a definite description of the boundaries of the territory to be embraced in the proposed addition.
Upon filing any petition with the clerk of the court, the court shall fix a time and place for a hearing upon the subject of the petition.
Notice shall be given by the court to whom the petition is addressed, or by the circuit clerk or sheriff of the county in which the petition is made at the order and direction of the court, of the time and place of the hearing upon the subject of the petition at least 20 days before the hearing by at least one publication of the notice in any newspaper of general circulation within the area proposed to be annexed, and by mailing a copy of the notice to the mayor or president of the corporate authorities of all of the municipalities located within the District.
At the hearing, all persons residing in or owning property located within the area proposed to be annexed to the District may appear and be heard concerning the sufficiency of the petition. If the court finds that the petition does not comply with the requirements of the law, then the court shall dismiss the petition. If the court finds that the petition is sufficient, then the court shall certify the proposition to the proper election officials, who shall submit the proposition to the voters at an election in accordance with the general election law. In addition to the requirements of the general election law, the notice of the referendum shall specify the purpose of the referendum with a description of the area proposed to be annexed to the District.
The proposition shall be in substantially the following form:
Shall (description of the territory proposed to be annexed) join the Ottawa Port District?
The votes shall be recorded as "Yes" or "No".
The court shall cause a statement of the result of the referendum to be filed in the records of the court.
If a majority of the votes cast upon the question of annexation to the District are in favor of becoming a part of the District, the court shall then enter an order stating that the additional territory shall thenceforth be an integral part of the Ottawa Port District and subject to all of the benefits of service and responsibilities of the District. The circuit clerk shall transmit a certified copy of the order to the circuit clerk of any other county in which any of the territory affected is situated.
70 ILCS 1837/165