Plumber License Requirements in Iowa
License RequiredLast verified March 9, 2026
Agency And Exam
Issuing agency: Iowa Department of Inspections, Appeals, & Licensing
Official licensing agency website
Exam provider: PSI
Reciprocity And License Levels
License levels
Apprentice PlumberJourneyperson PlumberMaster PlumberContractor
Reciprocity states
None listed
Notes
Iowa requires people working in plumbing and mechanical systems trades, or contracting for those services, to be licensed by the state's plumbing and mechanical systems board. The state licensure portal covers apprentice, journeyperson, master, and contractor licensing plus code and continuing education requirements. Verified against Iowa DIAL plumbing licensure materials on 2026-03-09.