A city council may implement a diminution of employees in a classification or grade under civil service. Such a diminution shall be carried out in accordance with any procedures provided in a collective bargaining agreement to which a bargaining unit that has at least thirty percent of members who are public safety employees as defined in section 20.3 is a party, if applicable.
Iowa Code § 400.28
86 Acts, ch 1138, §10, 11; 2010 Acts, ch 1069, § 131; 2017 Acts, ch 2, § 63, 64