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Plumbing License Types and Credentials Journeyman plumber: an individual, other than a master plumber, who, as a principal occupation, is engaged as an employee of, or is otherwise working under the direction of, a master plumber in the practical installation of plumbing. This license authorizes the individual to work statewide, for both interior plumbing and exterior water service, sanitary sewer and storm sewer systems within the property lines.