70 ILCS 3105/22
When the board of a district proposes to incur indebtedness and issue bonds, other than tax anticipation warrants and other than revenue bonds, it shall order a referendum on the proposal at a regular election at which all of the voters of the district may vote.
The district shall adopt an ordinance calling for the referendum and setting forth the proposal and the regular election for holding the referendum and shall certify the proposition and the ordinance to the proper election officials. The expenses incurred in connection with the conduct of the election shall be paid by the district. The referendum shall be in accordance with the general election law and in the case of districts composed of townships, a majority of those voting, in each township, shall be necessary for approval of such proposal.
70 ILCS 3105/22