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Boiler laws and 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 April 2019).


Rule development

2019 rule changes

The Board of Boiler Rules & Washington State Department of Labor & Industries will consider changes to the boiler rules. The changes would affect:

This rulemaking will:

  • Change the definition of "place of public assembly or assembly hall" to include assisted living facilities providing housing and basic services for seven or more residents
  • Allow authorized inspection agencies or inspectors to submit inspection reports using the state's online boiler database (Jurisdiction Online, or J.O.). If the agency or inspector doesn't have access to J.O., then reports can be submitted to L&I for processing, for a fee.
  • Establish a $7 fee per boiler and pressure vessel for the department to process inspection reports.

The following are the rulemaking documents:

Here's what happens next:

  • July 23: The final rules (Rule-Making Order CR-103) filed with the state Code Reviser's Office.
  • Sept. 1, 2019: The new rules will take effect.


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