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

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

Download our Boilers and Unfired Pressure Vessel Laws Book (updated August 2022).

Rule Development

2023 Rule Changes and Fee Increase

The Board of Boiler Rules and the Washington Department of Labor & Industries (L&I) is proposing changes to the boiler rules. The change affect safety codes, installer and clearance requirements, and fee for boilers and pressure vessels.

The updates are needed to ensure the rules are consistent with national boiler and unfired pressure vessel standards and industry practice. A fee increase by the fiscal growth factor rate of 6.40% is needed to cover continuing operating expenses. It would take effect in fiscal year 2025 , which starts July 1, 2024.

How to participate

A public hearing on the proposed rules is scheduled for February 21, at 10:20 a.m.  The public hearing will be a "hybrid" event, that is, people can attend in person, by telephone, or Zoom.  The hearing will continue until all oral comments are received.

The public hearing will take place at the L&I Headquarters Building, 7273 Linderson Way SW Tumwater.

You can also join by either: 


Click here to join the meeting:

Passcode: 8.Lzpi?w



Meeting ID: 878 7881 1300

Passcode: 73603315

You can provide testimony or written comments at the hearing, or send written comments by 5 p.m. on February 13, 2024, to:

  • Meagan Edwards
  • Email:  
  • Mail: Department of Labor & Industries, Field Services & Public Safety Division,                 PO Box 44400, Olympia, WA 98504-4400

If you require communication or accommodation arrangements, please contact Meagan Edwards at 360-522-0125, by February 7.

Rulemaking Documents

Rulemaking Proposals

CR-101 Preproposal

Proposed Rule Language (12/19/2023)

Here's what happens next:

  • Feb. 21, 2024: A public hearing on the proposed rules is scheduled for 10:20 a.m.
  • Apr. 16, 2024: The final rules (CR-103) are expected to be filed with the state's Office of the Code Reviser.
  • July 1, 2024: The new rules are expected to take effect.

All Boiler Program Rulemaking