A sufficient sum of money shall be appropriated each year by the trustees to carry out the provisions of this Act; and the trustees shall allow to said civil service board such clerical help and such sums to operate and maintain said office as shall be necessary and the compensation of such clerical help and such sums allowed shall be paid by the sanitary district as other sanitary district charges. If the trustees shall have already made the annual appropriations for sanitary district purposes for the current fiscal year, the trustees are authorized and required to pay the salaries and expenses of the civil service board for such fiscal year out of the moneys appropriated for contingent purposes by said trustees.
70 ILCS 2605/4.20