70 ILCS 1863/38
The registered voters of a county included in the District may petition the local election authority requesting the submission of the question of whether the county should be disconnected from the District to the electors of the county. The petition shall be circulated in the manner required by Section 28-3 of the Election Code and objections thereto and the manner of their disposition shall be in accordance with Section 28-4 of the Election Code. If a petition is filed with the local election authority , signed by not less than 5% of the registered voters of the county or that portion of the county that is within the District, requesting that the question of disconnection be submitted to the electors of the county, the local election authority must certify the question to the proper election authority, which must submit the question at a regular election held at least 78 days after the petition is filed in accordance with the Election Code.
The question must be submitted in substantially the following form:
Shall (name of county) be disconnected from the Upper Mississippi River International Port District? The votes must be recorded as "Yes" or "No". If a majority of the electors voting on the question vote in the affirmative, the county or portion of the county that is within the District shall be disconnected from the District.
70 ILCS 1863/38