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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.
Job Description for Master Plumber. Master plumbers are highly experienced and skilled plumbers; in some states, this position requires licensing to provide proof of their experience. They are often the first plumber to arrive at a job site to inspect the customer's problems and develop a plan with the customer.