70 ILCS 805/8b
The board of commissioners of any forest preserve 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 10 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 commissioners 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 depository, 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.
Notwithstanding any provision of this Act or of any other law, each official custodian of forest preserve district funds, including, without limitation, each forest preserve district treasurer and each person properly designated as custodian for funds held by an intergovernmental risk management association or self-insurance pool composed solely of participating park districts, forest preserve districts or park district joint recreational programs, is permitted to (i) combine moneys from more than one fund of a single forest preserve district, risk management association or self-insurance pool for the purpose of investing such moneys, (ii) enter into agreements of any definite or indefinite term regarding the deposit, redeposit, investment, reinvestment or withdrawal of forest preserve district, risk management association or self-insurance pool funds and (iii) join with any custodians or treasurers of forest preserve district, park district, Chicago Park District, park district joint recreational program, risk management association or self-insurance pool funds for the purpose of investing any forest preserve district, risk management association or self-insurance pool funds in his custody. When funds are combined for investment purposes as authorized herein, the moneys combined for such purposes shall be accounted for separately in all respects, and the earnings from such investments shall be separately and individually computed and recorded, and credited to the fund, district, park district joint recreational program, risk management association, self-insurance pool or other entity, as the case may be, for which the investment was acquired. The grant of authority contained in this Section is cumulative and in addition to all other power or authority granted by any other law and shall not be construed as a limitation of any power or authority otherwise granted.
70 ILCS 805/8b