Carbon monoxide (CO) is a silent, odorless, colorless gas that can be deadly. Proper installation of CO detectors in your home is essential to protect your family.

California Law Requirements

Who Must Comply:

• All single-family homes with fossil-fuel burning appliances, fireplaces, or attached garages.
• Multi-family dwellings, apartments, and rental units also require CO detectors; the property owner is responsible.

Effective Dates:

• The law has been in effect since 2011 for single-family homes and 2013 for other residential units. All applicable homes should already have detectors installed.

Enforcement:

• Compliance is generally overseen by local building officials. Lenders may also check for CO detectors during home sales.

Fines:

• Penalties vary by local jurisdiction. Homeowners and landlords are encouraged to comply promptly to avoid enforcement actions.

Where to Install CO Detectors

• Correct Placement: CO detectors should be installed on the ceiling or high on a wall (around 5 feet above the floor), following manufacturer instructions.
• Avoid Floor-Level Installation: Unlike some gases, CO is slightly lighter than air, so floor placement is not effective.
• Near Sleeping Areas: Place detectors outside bedrooms and near fuel-burning appliances for maximum safety.
• Combination Units: Many detectors include smoke detection as well—these can simplify placement.

Common Sources of Carbon Monoxide

• Gas heating systems
• Natural gas or LP gas appliances
• Wood, coal, or pellet stoves
• Kerosene or oil heaters
• Diesel generators or vehicles running in attached garages

Note: Incomplete combustion of these fuels is the primary cause of CO poisoning.

Signs of CO Poisoning

If CO accumulates in your home, you and your family may experience:

• Headache or dizziness
• Nausea or vomiting
• Shortness of breath
• Confusion or loss of consciousness

Action: If these symptoms occur, evacuate immediately, get fresh air, and call 911.

What to Do if Your CO Detector Alarms

1. Evacuate immediately with all household members and pets.
2. Call 911 if anyone is experiencing symptoms.
3. Ventilate the home by opening doors and windows once safely outside.
4. Do not re-enter until a qualified professional has inspected and resolved the source.
5. Turn off appliances or heating systems only after evacuating safely.

Important: Keep the detector powered and active until emergency services arrive to continue alerting you of danger.

Cost of CO Detectors

• Basic units typically cost $20–$50.
• Combination smoke/CO detectors can range $40–$100.

Key Takeaways

• Carbon monoxide is deadly and undetectable without a detector.
• California law requires detectors in almost all residential properties with fuel-burning appliances or attached garages.
• Proper placement, maintenance, and prompt action in case of alarm save lives.