330A.20  Dissolution of an authority.
  When an authority has fully discharged all of its debts and obligations or has arranged for the assumption of its debts and obligations by another public agency, it may be dissolved by unanimous consent of the member municipalities upon enactment of an ordinance to dissolve the authority by each member municipality. If all members withdraw from the authority, the authority is dissolved. When the business and affairs of an authority have been closed upon dissolution, that fact shall be certified by the chairperson of the board to the recorders of the counties in which the authority was situated and to the secretary of state.
89 Acts, ch 182, §8