Iowa Code § 145A.15

If the area hospital is located within the corporate limits of any city, the city treasurer shall act as treasurer of the area hospital; and if the area hospital is located outside the limits of any city, the county treasurer shall act as the treasurer of the area hospital; provided, however, the board may appoint some other person to serve as treasurer. The board may require that the treasurer furnish appropriate bond for faithful performance of the treasurer’s duties.