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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.
There is not a standard licensure requirement for those in the plumbing profession. 1  However, the majority of states do require that a plumber carry some sort of license. Although license requirements vary across the country, plumbers typically should expect to fulfill the following requirements when seeking licensure: 1  Hold 2-5 years of experience in the field. 2  Be able to pass a plumber exam that measures plumbing aptitude. 3  Possess significant knowledge of local plumbing codes.