Iowa Plumbing License Requirements
Yes. Iowa licenses plumbers through the Iowa Plumbing & Mechanical Systems Board (DIAL). It issues apprentice, journeyman, master and contractor credentials.
State plumber license · By BrazeJobs Team · Updated
License tiers
| Apprentice | Apprentice license |
| Journeyman | Journey |
| Master | Master |
| Contractor | Contractor |
Requirements
| Journeyman experience | 4 years practical experience |
| Exam | PMSB exam |
| Minimum age | 18 |
| Fees | Exam $35 per discipline + testing fee |
| Renewal | 3 years |
| Continuing education | 8 hours per license |
| Local license | No (state license covers) |
| Board | Iowa Plumbing & Mechanical Systems Board (DIAL) |
Exam
| Exam provider | Board-approved provider (not named) |
Plumbing and Mechanical Systems Board exams; $35 per trade exam; provider named only in the approval letter.
- Source: dial.iowa.gov · checked November 6, 2026
Licensed in another state or the military
| Military experience credit | Yes: verified military education, training or service credited toward experience/education requirements (481 IAC 7.2) |
| Military spouses | Active-duty spouses and veterans with another state's license may apply by reciprocity; required exams still apply (credit for exams passed); expedited (481 IAC 7.3) |
- Source: legis.iowa.gov · checked November 6, 2026
Apprenticeship
| Registering agency | State Apprenticeship Agency (Iowa Office of Apprenticeship (IWD)) |
- Source: apprenticeship.gov · checked November 6, 2026
- Source: workforce.iowa.gov · checked November 6, 2026
Plumbing code
| Code in force | 2021 UPC with state amendments |
Iowa State Plumbing Code (641-25.1), effective June 23, 2021; includes some 2021 IPC excerpts
- Source: dial.iowa.gov · checked November 5, 2026