70 ILCS 1825/20
All funds deposited by the treasurer in any bank or savings and loan association shall be placed in the name of the District and shall be withdrawn or paid out only by check or draft upon the bank or savings and loan association, signed by the treasurer and countersigned by the chairman of the Board. The Board may designate any of its members or any officer or employee of the District to affix the signature of the chairman and another to affix the signature of the treasurer to any check or draft for payment of salaries or wages and for payment of any other obligation of not more than $2,500.00.
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 1825/20