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What Is a Master Plumber? A master plumber is a licensed plumbing professional who has passed a state's rigorous testing and certification process for plumbers. To earn this designation, a plumber has to not only pass the tests but accumulate years of practical experience in the plumbing and pipefitting field.
A licensed journeyman plumber is permitted to install, repair and maintain any plumbing system in the state of licensure. Journeyman plumbers are not licensed to direct large, commercial plumbing projects. Many journeymen plumbers choose to pursue their master-plumber credential. If a journeyman has held a license for a specific period of time and worked a certain number of hours both determined by the state board that issued the license he may apply for a master-plumber license.