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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.
An affidavit with the signature and the plumber certification number of the master plumber verifying that you have completed your apprenticeship. Be at least 18 years old. Submit a registration application at your stateâs journey man plumber exam. Examination. Take the written Journeyman plumber exam. Cost: around $250 (depends on state)