65 ILCS 5/11-118-5
The electors of a municipality may adopt and become entitled to the benefits of this Division 118 in the following manner: whenever a number equalling 1,000, or one-eighth, whichever is less, of the electors of a municipality, voting at the last preceding election, petition the circuit court for the county in which that municipality is located, to order submitted to a vote of the electors of that municipality the proposition whether that municipality shall adopt and become entitled to the benefits of this Division 118, that court shall order this proposition certified and submitted accordingly, at an election in accordance with the general election law. If the proposition is not adopted at this election, it shall in like manner be submitted to a vote of the electors of that municipality upon order of that court upon like application at any succeeding election.
65 ILCS 5/11-118-5