Plumbing Rule Changes

The Washington Administrative Code (WAC) and the Revised Code of Washington (RCW) are maintained and updated by the State Office of the Code Reviser (

If you receive an error message when referencing a link to a specific section of a WAC or RCW, try your search at the Washington State Legislative Search page (

Plumber Certification Law - RCW 18.106 (

Plumber Certification Rules – WAC 296-400A (


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