Iowa Code § 297.16: Appraisers.

In case the school district and said owner of the tract from which such school site was taken, do not agree as to the value of such site, the chief judge of the judicial district of the county in which the greater part of such school district is situated, shall, on the written application of either party, appoint three disinterested voters of the county from the list of persons eligible to serve as compensation commissioners to appraise the site.