70 ILCS 1505/23
The treasurer or other officer responsible for the funds of the district, shall be discharged from the responsibility for all moneys deposited by him pursuant to order, or ordinances of the commission with any depository which may be so named and qualified, and this shall be considered by said commission in fixing the bond of such treasurer. The commission shall have full authority to regulate by ordinance all details with respect to the matters covered by this Section and to establish active and inactive banks or savings and loan associations or to make any other provisions appropriate or incident to the proper exercise of the duties imposed by this Section.
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, the treasurer or other officer responsible for the funds of the district, including, without limitation, each person properly designated as official custodian of any funds held for the district, including, without limitation, the official custodian of district funds held by an intergovernmental risk management association or self-insurance pool composed solely of participating park districts, forest preserve districts or joint recreational programs, is permitted to (i) combine moneys from more than one fund of the district, a risk management association, including the district, or a self-insurance pool, including the district 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 district, risk management association or self-insurance pool funds and (iii) join with any custodians or treasurers of park district, joint recreational program, risk management association, self-insurance pool or forest preserve district funds for the purpose of investing any 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 investment shall be separately and individually computed and recorded, and credited to the fund, 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 supplemental and in addition to all other powers or authority granted by any other law and shall not be construed as a limitation of any power or authority otherwise granted.
70 ILCS 1505/23