26.16  Prequalification requirements prohibited.
  A governmental entity shall not by ordinance, rule, or any other action relating to contracts for public improvements for which competitive bids are required by this chapter impose any requirement that directly or indirectly restricts potential bidders to any predetermined class of bidders defined by experience on similar projects, size of company, union membership, or any other criteria. However, a governmental entity shall require nonresident bidders to comply with section 73A.21, subsection 4.
2017 Acts, ch 65, §2, 9, 10
Section takes effect April 13, 2017, and applies to notices to bidders for public improvements, bids awarded for public improvements, and contracts for public improvements entered into on and after that date; 
2017 Acts, ch 65, §9, 10