WASHINGTON STATE CARBON MONOXIDE DETECTOR RULES
Requirements to have CO alarms installed in residential rental dwellings are as follows:
By January 1, 2011, carbon monoxide alarms must be installed in all new residential construction in R-1, R-2 and R-3 occupancies where an attached garage or fuel-fired heat source is present.
- By January 1, 2013, carbon monoxide alarms must be installed in existing dwelling and sleeping units in hotels, motels, apartments and single family residential units where an attached garage or fuel-fired heat source is present.
- Owner-occupied single family residences legally occupied before July 20, 2010, are exempt from these requirements.
The alarms must meet the following requirements:
- Alarms must be located outside of each separate sleeping area, in the immediate vicinity of the bedroom.
- Single station carbon monoxide alarms must be listed as complying with UL 2034, and installed in accordance with the code and the manufacturer’s instructions.
RCW 19.27.530, WAC 51-51-0315.