Although most plumbers, pipefitters, and steamfitters learn on the job through an apprenticeship, some start out by attending a technical school. Most states and localities require plumbers to be licensed.
Source: MyPlan.com, LLC, 2019; includes information from the O*NET 20.3 database, 2016, and the Bureau of Labor Statistics, U.S. Department of Labor, Occupational Outlook Handbook, 2014-2024 Edition. O*NET™ is a trademark of the U.S. Department of Labor, Employment and Training Administration.