Iowa Admin. Code r. 11-7.11
7.11(2) Petition. When an action of the department is appealed and pleadings are required under subrule 7.11(1), the aggrieved party shall file the petition.
b. The petition shall state in separately numbered paragraphs the following:
7.11(3) Answer. If pleadings are required, the answer shall be filed within 20 days of service of the petition or notice of hearing, unless otherwise ordered.