70 ILCS 410/7
The board of any district, when so requested by the treasurer of the district, shall designate one or more banks or savings and loan associations in which the funds and moneys received by the treasurer, by virtue of his office, may be deposited.
Each bank or savings and loan association designated as a depository for district funds or moneys shall, while acting as such depository, furnish the district with a copy of all statements of resources and liabilities which it is required to furnish to the Commissioner of Banks and Real Estate or to the Comptroller of the Currency and no bank is qualified to receive such district funds or moneys until it has furnished the district with copies of the last 2 such statements.
The treasurer of the district shall be discharged from responsibility for all funds and moneys while they are deposited in a designated bank or savings and loan association.
No bank or savings and loan association shall receive public funds as permitted by this Section, unless it has complied with the requirements established pursuant to Section 6 of the Public Funds Investment Act.
When a bank or savings and loan association has been designated as a depository it shall continue as such until 10 days have elapsed after a new depository is designated and is qualified. When a new depository is designated, the district shall notify the sureties of the treasurer of that fact in writing at least 5 days before the transfer of funds.
70 ILCS 410/7