70 ILCS 2205/7a
The board of trustees of any sanitary district organized under this Act, 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. When a bank or savings and loan association has been designated as a depository it shall continue as such until ten days have elapsed after a new depository is designated and is qualified by furnishing the statements of resources and liabilities as is required by this section. When a new depository is designated, the board of trustees shall notify the sureties of the treasurer of that fact, in writing, at least 5 days before the transfer of funds. The treasurer of the district shall be discharged from responsibility for all funds and moneys deposited in a bank or savings and loan association, so designated, while such funds and moneys are so deposited.
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 "An Act relating to certain investments of public funds by public agencies", approved July 23, 1943, as now or hereafter amended.
70 ILCS 2205/7a