Carbon monoxide (CO) is a colorless, odorless, and poisonous gas that can cause serious illness or death. Because you cannot see, smell, or taste carbon monoxide, a working CO alarm may be the only warning that dangerous levels are present in your home.

Where Does Carbon Monoxide Come From?

Carbon monoxide is produced whenever fuel is burned. Common sources include:

• Furnaces and other fuel-burning heating equipment
• Fireplaces and wood stoves
• Gas ranges and ovens
• Portable generators
• Grills
• Cars and trucks
• Small engines and other fuel-powered equipment

Carbon monoxide can build up indoors when these appliances or equipment are improperly used, poorly ventilated, or malfunctioning.

If Your CO Alarm Sounds

Never ignore a carbon monoxide alarm. If your CO alarm sounds, move everyone outside to fresh air and call 9-1-1 from a safe location. Do not re-enter the home until emergency personnel have determined it is safe.

Carbon Monoxide Alarms in Washington

Washington State law RCW.19.27.530 requires carbon monoxide alarms in new residences and existing rental properties. Requirements may also apply to certain owner-occupied homes when they are sold or when specific remodeling work requires a building permit.

For more information about carbon monoxide alarm requirements, visit the Washington State Building Code Council website.