Iowa Code § 468.327
A district formed pursuant to this part, under the control of a city council, may be placed under the control and management of a board of trustees as provided in subchapter III of this chapter. Each trustee shall be a citizen of the United States not less than eighteen years of age and a bona fide owner of benefited land in the district for which the trustee is elected. If the owner is a family farm corporation as defined by section 9H.1, subsection 9, a business corporation organized and existing under chapter 490 or 491, or a partnership, a stockholder or officer authorized by the corporation or a general partner may be elected as a trustee of the district.
Iowa Code § 468.327
84 Acts, ch 1040, §1 89 Acts, ch 126, §2 90 Acts, ch 1205, §14; 93 Acts, ch 126, §4