70 ILCS 2405/30

The corporate authorities of any successor municipality required to provide sewer or water service under this Act may levy and collect for that purpose a tax upon the taxable property within that successor municipality, the aggregate amount of which for each year may not exceed .25% of the value of such property as equalized or assessed by the Department of Revenue and that tax shall be in addition to taxes authorized to be levied for the general corporate purposes of the municipality.