65 ILCS 5/11-131-1
The corporate authorities of any municipality, whether incorporated under a special charter or the general law, which now has, or hereafter may have, established or leased a waterworks system for the supply of water to its inhabitants, has the power annually to levy and collect a tax not to exceed .0166% of the value, as equalized or assessed by the Department of Revenue, of the taxable property in the municipality, for the extension of watermains or pipes in the municipality and for the maintenance of its waterworks system, or for the creation of a sinking fund to be applied to the establishment of a waterworks system. However, the board of public works of the municipality, if any, or the head of the municipality's water department, shall first certify to the corporate authorities the amount that will be necessary for the specified purposes, and shall further certify that the revenue from the waterworks system will be insufficient therefor. This tax shall be known as the water fund tax and shall be levied and collected in the same manner as are the other general taxes of the municipality. A two-thirds majority of all the corporate authorities may levy and collect annually, a tax not to exceed .05% of the value, as equalized or assessed by the Department of Revenue, of the taxable property in the municipality, for the specified purposes.
The corporate authorities of each municipality, with the concurrence of two-thirds of all of the members elected thereto, may levy and collect annually, in addition to all other taxes now authorized by law, a further tax of not to exceed .033% of the value, as equalized or assessed by the Department of Revenue, of the taxable property in the municipality, to be used exclusively for the purpose of supplying water to the municipality.
Nothing in this Section increases the aggregate amount of tax, as limited in Section 8-3-1, that may be levied in any one year.
65 ILCS 5/11-131-1