The plumbing contractor licensing system continues evolving through ongoing rulemaking as the 2021 changes are fully implemented. Every plumbing professional in Washington must begin as a certified trainee. This certificate allows you to work under direct supervision while gaining the experience needed for advanced certification. The categories below list the required experience for each plumber certification level in Washington. C. Flood is ready and willing to help you with whatever plumbing service repair you have on your hands in a quick, cost-effective, and efficient way.

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