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 August 2022).