70 ILCS 605/5-21
Annual maintenance assessments are due and payable and are a lien upon the land and other property included in the annual maintenance assessment roll upon the first day of January next succeeding the confirmation of the levy, whether by order of the court or by failure of any landowner to file written objections or by the failure of the court to determine the objections, and all persons are charged with notice thereof. Such lien shall continue until the assessment is paid, and when so paid the collector, if requested, shall deliver to the person or persons paying the assessment a release of the lien of the assessment. One-half of the annual maintenance assessment shall become delinquent, if unpaid, on the first day of the following June, and the remaining half shall become delinquent, if unpaid, on the first day of the following September. Delinquent annual maintenance assessments, or portions thereof, shall draw interest at the rate of one-half of one per cent per calendar month or fraction thereof, from the date of delinquency until paid.
70 ILCS 605/5-21