Arizona Carbon Monoxide Detector Law

The Law in Plain English

Required in new residential construction under state building code.

What This Means for Homeowners & Renters

Arizona requires carbon monoxide detectors in newly constructed residential buildings under the state building code (since 2013). If your home was built before this requirement took effect, you may not be covered by state law — but you are still at risk. Older homes with fuel-burning appliances, attached garages, or inadequate ventilation face the same CO exposure hazards as new construction. Installing a CO detector in every older home is the responsible choice regardless of whether state law currently requires it. For renters: Landlord requirements vary — check your local municipality or lease agreement.

Landlord Requirements in Arizona

Landlord requirements vary — check your local municipality or lease agreement.

Check your lease agreement and contact your local housing authority or fire marshal's office to determine whether a CO detector requirement applies to your rental unit. Requirements often differ between cities, counties, and building types (single-family vs. multifamily).

Recommended CO Detector Placement

Regardless of what Arizona law requires, safety experts recommend placing CO detectors on every level of your home, within 10 feet of each sleeping area, and near any fuel-burning appliance (furnace, water heater, gas stove, fireplace). Replace your CO detector every 5–7 years — electrochemical sensors degrade over time regardless of whether the device appears functional.