Iowa Code § 468.502: Election.

The board, at the next regular, adjourned, or special session shall canvass the petition and if signed by the requisite number of landowners, it shall order an election to be held at some convenient place in the district not less than forty nor more than sixty days from the date of such order, for the election of three trustees of such district. It shall appoint from the freeholders of the district who reside in the county or counties, three judges and two clerks of election. It shall not be mandatory for the county commissioner of elections to conduct elections held pursuant to this subchapter, but they shall be conducted in accordance with the provisions of chapter 49 where not in conflict with this subchapter.