Laws & Rules

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:

The proposed rules 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 they can submit it to L&I which will process the report. L&I would charge a fee to process the inspection reports.
  • 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:

  • April 2: Proposed rules (CR-102) filed with the state Code Reviser's Office.
  • May 22: A public hearing on the proposed rules is scheduled for 10 a.m. The meeting will take place at L&I Tacoma, 950 Broadway, Suite 200, Tacoma, WA.
  • May 21-22: Board of Boiler Rules study session and meeting.
  • July 23: The final rules (CR-103) are expected to be filed with the state Code Reviser's Office.
  • Sept. 1, 2019: The new rules are expected to take effect.


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