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Licensing for Plumbers To work as a licensed plumber and do plumbing work in most states, a plumbing professional must have a plumbing license. To receive a plumbing license a service professional must pass both a written and a practical plumbing exam. The plumbing examination to become a plumber includes knowledge on the following subjects:
sanitary drainage systems
special sewage waste piping storm drainage systems vents & ventilation waste & vent systems plumbing fixtures water distribution systems cross plumbing connections calculations & blueprint reading
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