Certification, Licensing, and Special Requirements
Certification or Licensing
Most states require plumbers to be licensed. To obtain this license, plumbers must have two to five years of experience and pass a special examination to demonstrate their knowledge of local building codes as well as their all-around knowledge of the trade. To become a plumbing contractor in most places, a master plumber's license must be obtained. Several states require plumbers who work on gas lines to have a special license. Check with the state that you plan to work in to determine the requirements.
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