Iowa Code § 28I.2
The commission shall have not less than five members, appointed by the governing bodies of the area served by the commission. A majority of the members of the commission may be citizens who hold no other public office or position except appointive membership on a city plan commission or other planning commission, board or agency. Citizen members shall be appointed for overlapping terms of not less than three nor more than five years or thereafter until their successors are appointed. The appointing governing bodies shall determine the amount of compensation, if any, to be paid to the members of a commission. Any vacancy in the membership of a commission shall be filled for the unexpired term in the same manner as the initial appointment. The governing bodies shall have authority to remove any member for cause stated in writing and after a public hearing.
Iowa Code § 28I.2