Each director shall take and subscribe an official oath for the faithful discharge of the duties of his or her office and shall execute an official bond to the district in the sum of twenty-five hundred dollars conditioned for the faithful discharge of his or her office, which bond shall be approved by the judge of the superior court of the county where the organization of the district was effected, and said oath and bond shall be recorded in the office of the clerk of the superior court and filed with the secretary of the district.