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Boiler laws & rules

Laws and rules pertaining to boilers, water heaters, and unfired pressure vessels can be found in the following:

Washington Administrative Code (WAC) Chapter 296-104 Revised Code of Washington (RCW) Chapter 70.79.

The laws and rules are maintained and updated by the State Office of the Code Reviser (

Download and print our Boilers and Unfired Pressure Vessel Laws Book (1.1 MB PDF) (updated 5/2018).


Rule development

2018 rule changes

A 4 percent increase in fees the Washington State Department of Labor & Industries charges for boiler-related services will take effect January 1, 2019.

L&I and the Board of Boiler Rules approved the increase as part of changes to the Washington Administrative Code Chapter 296-104. The changes were adopted November 20 and include new safety code requirements and updates and clarifications to existing rules.

Among the updates:

  • Adopt amendments to the definition of "hot water heater" to clarify existing requirements.
  • Replace the "A" endorsement with authorized inspector commission to align with National Board Inspection Code (NBIC), NB-263 RCI-1 for inspector commissions and endorsements.
  • Adopt amendments to align the rules with the NBIC, current edition, Part 4 for installation, inservice inspection, and repair of pressure relief devices.
  • Adopt the NBIC, current edition, Part 1, as the standard for installation of non-nuclear boilers, unfired pressure vessels and safety devices in the state of Washington.
  • Adopt language to clarify the duties of in-service inspectors in relation to other standards and requirements for which other regulatory agencies have authority or responsibility.
  • Adopt the Uniform Plumbing Code (UPC), Section 608.5 with Washington State amendments as discharge piping requirements for water heaters.
  • Replace Supplement 10 with Supplement 7 for nonnuclear repairs and alterations to align the rule with the NBIC, current edition, Part 3.

What happens next?

  • January 1, 2019: The new rules take effect.

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