Carbon Monoxide Alarms

The Law has Changed for Carbon Monoxide Alarms           

As of January 1, 2026, changes to the Ontario Fire Code require increased carbon monoxide (CO) alarm detection in residential occupancies and care occupancies.

CO is a silent killer: it’s colourless, odourless, tasteless and can be deadly when inhaled in high concentrations. It’s produced when fuels like wood, gas, oil, or propane don’t burn completely. Without proper ventilation, CO can build up indoors, making a working carbon monoxide alarm essential for home safety.

A carbon monoxide alarm is a device that detects unsafe levels of CO in your home and sounds an alarm to warn you to evacuate. Because CO is undetectable by human senses, an alarm is the only reliable way to know that it is present.

 In Ontario, carbon monoxide alarms are legally required in any home that has:

  • A fuel-burning appliance (like a gas stove, water heater, or fireplace),
  • A wood-burning fireplace, or
  • An attached garage
  • An outdoor furnace

This applies to detached houses, townhouses, apartments and condos.

 Where should CO alarms be installed?

In houses and townhomes where CO alarms are required:

  • CO alarms are required adjacent to each sleeping area and on every level of the home.
  • For example, if bedrooms are on the same floor but far apart (for example, on opposite sides of a living room) you need two CO alarms on that floor: one in the hallway outside each group of bedrooms.

 Testing and maintaining your CO alarm

Carbon monoxide alarms need regular testing and replacement to work properly:

  • Test monthly by pressing the “Test” button
  • Replace batteries yearly (unless your alarm uses a sealed battery)
  • Replace the alarm every seven to 10 years, or according to manufacturer instructions. Look for models marked CSA-6.19 or UL 2034 to meet safety standards.

Renters should test alarms monthly and report any issues to their landlord. Landlords are responsible for ensuring working alarms are installed.

 CO safety tips for winter

As temperatures drop and we close our windows, CO risks increase. Follow these tips to stay safe:

  • Book an annual inspection of all fuel-burning appliances: furnaces, fireplaces, gas stoves, gas dryers and chimneys.
  • Keep vents, intakes and exhaust pipes clear of snow and debris.
  • Never idle your car in the garage, even with the door open.
  • Only use generators and fuel-powered equipment outside, far from windows, doors, or vents.
  • Do not use gas stoves, ovens, BBQs, or camping equipment to heat your home unless the device is designed for indoor use.

If you have any questions or require assistance, contact the Deep River Fire Department at 613.584.2000 Ext 190