70 ILCS 2805/76
Except as otherwise provided in Section 9-2-113 of the Illinois Municipal Code, as now or hereafter amended, no person obtaining contracts from the district and agreeing to be paid out of special assessments or special taxes has any claim or lien upon the district in any event except from the collection of special assessments or special taxes made or to be made for the work contracted for. However, the district shall cause collections and payments to be made with all reasonable diligence. If it appears that such an assessment or tax cannot be levied or collected, the district nevertheless is not in any way liable to a contractor in case of failure to collect the assessment or tax, but, so far as it can legally do so, with all reasonable diligence, it shall cause a valid assessment or assessments, or special taxes, to be levied and collected to defray the cost of the work until all contractors or bond holders are fully paid. Any contractor is entitled to the summary relief of mandamus or injunction to enforce the provisions of this Section.
The district treasurer shall keep a separate account of each special assessment and of the money received thereunder.
70 ILCS 2805/76