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Plumbing License Requirements. Plumbers licensing requirements for a journeyman and master plumbers license are usually determined at the state level and the necessary requirements and exams vary in each State. The enforcing & regulating of the state plumbing licensing requirements often fall under individual municipalities.
(See Iowa Code section 105.20 and chapter 272C) For each plumbing and mechanical systems board license, the basic requirement is at least 8 hours of classroom instruction during each three-year licensing term. For a course to be valid, both the instructor and the course must be pre-approved by the board.