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 our Boilers and Unfired Pressure Vessel Laws Book (updated July 2024).
Rule development
2024 rulemaking
The Board of Boiler Rules and the Washington Department of Labor & Industries (L&I) have adopted an increase in program fees and clarified the definition for pool heaters.
The agency adopted a 6.41% fee increase to cover L&I Boiler Program operating expenses.
- The agency filed a CR-103 Adoption Order on April 22. The changes affect:
- WAC 296-104-010, Administration—What are the definitions of terms used in this chapter?
- WAC 296-104-700, What are the inspection fees – Examination fees – Certificate fees – Expenses?
The adopted rule amendments take effect July 1, 2025.
Rulemaking documents
Notice of intent (10/22/2024)
Proposed rule language (01/02/2025)
Final adoption (4/22/2025)