70 ILCS 1815/3.1
If a petition is filed with the State Board of Elections, signed by not less than 5% of the registered voters of the district, requesting the submission to a referendum of the question "Shall .... township be disconnected from the Illinois Valley Regional Port District?", the State Board of Elections shall certify the question to the election authorities in the district who shall submit the question to the voters of the district at the next regular election held at least 78 days after the petition is filed. The petition shall be circulated in the manner required by Section 28-3 of The Election Code, objections thereto and the manner of their disposition shall be in accordance with Section 28-4 of The Election Code, and notice of the election shall be given in the manner provided in Article 12 of The Election Code. The Board shall cause the results of the referendum to be entered upon the records of the port district. If a majority of the vote on the proposition is in favor thereof, the Board shall declare the township to be disconnected from the district.
70 ILCS 1815/3.1