Iowa Code Title III. Public Services and Regulation [Chs. 80-122C] § 105.17. Preemption of local licensing requirements

a. On July 1, 2009, all plumbing and mechanical licensing provisions promulgated by any governmental subdivision shall be null and void, except reciprocal licenses as provided in section 105.21, and of no further force and effect.

b. On and after July 1, 2008, a governmental subdivision shall not prohibit a contractor or a plumbing, mechanical, HVAC-refrigeration, sheet metal, or hydronic professional licensed pursuant to this chapter from performing services for which that person is licensed pursuant to this chapter or enforce any plumbing and mechanical licensing provisions promulgated by the governmental subdivision against a person licensed pursuant to this chapter.