Any claim against the district shall be presented to the district board for allowance or rejection. Upon allowance, the claim shall be attached to a voucher verified by the claimant or his or her agent and approved by the chair of the board and countersigned by the secretary and directed to the county auditor of the county in which the office of the district treasurer is located, for the issuance of a warrant against the proper fund of the district in payment of said claim.