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Home > California Law Requires New and Existing Homes to Have Carbon Monoxide (CO) Alarms
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Why do I need CO Alarm?
  • IT'S THE LAW in California.
  • Up to 40 California residents die each year from carbon monoxide poisoning.
  • Approximately every nine minutes, a fire department in the U.S. responds to a residential carbon monoxide (CO) poisoning.
  • Kidde, the leading manufacturer of residential CO alarms, fully supports "Residential Carbon Monoxide Poisoning Prevention Act" passed by U.S. House of Representatives.
  • Because you can't see, smell or taste carbon monoxide, a family must have confidence that its CO alarm will alert them when danger occurs.
  • The safest known way to detect carbon monoxide is to install a working CO alarm.
  • Kidde's CO alarms are rigorously tested to obtain third-party approval and meet UL 2034.
  • CO Alarms are also required in the following states: NY, NJ, CT, VT, MA, MN, IL, RI, FL, UT, MD, GA, CO, WI, ME, MT, NC, NH, OR, PA, IA, WA, AK, WV, CA, ND, SC and MI.

Recommended Models
Combo smoke/CO alarm is the MOST COST-EFFECTIVE way to fulfill the requirements Wire-in CO alarm with battery back up Battery powered CO Alarm Plug-in Co Alarm

New Constructions

Effective January 1, 2011

  • Impacted Dwellings:
    RESIDENTIAL (CA Residential Code, 2010)
    All newly constructed detached one- and twofamily dwellings and townhouses not more than three stories in height that contain fuel burning appliances or an attached garage. Also, when such an existing dwelling requires a permit for alterations, repairs or additions exceeding $1,000.
    COMMERCIAL (CA Building Code, 2010)
    (I-1) Group homes, assisted living facilities housing more than 16 persons in a supervised environment who are capable of responding to an emergency.
    (R-1) Hotels, boarding houses, etc.
    (R-2) Apartments, dorms, etc.
    (R-3) Adult and child day care facilities, etc.
  • Approved Alarms: Must be hardwired with battery backup and interconnected. Existing dwellings with alterations may be solely battery operated IF alterations do not result in the removal of drywall or ceilings finishes or there is no access by means of attic, basement, or crawlspace. Must comply with UL 2034 and be approved and listed by the CA State Fire Marshal.
  • Installation: CO alarms must be installed outside of each separate sleeping area in the immediate vicinity and on every level of the dwelling (including basements). (R-1 facilities only—alarm must be installed on the ceiling of sleeping units with permanently installed fuel-burning appliances.)

Existing Home info

Effective DATES:
July 1, 2011 Existing Single -Family Dwellings
January 1, 2013 Existing Multi -Family Dwellings

  • Impacted Dwellings: Any single-family dwelling, duplex, lodging house, private dormitory, hotel, motel, condo, time-share or multiple unit dwelling that contains a fossil-fuel burning heater, appliance, fireplace or attached garage.
  • Approved Alarms: May be battery operated,plugin with battery backup, or hardwired with battery backup. Must comply with UL 2034 and be approved and listed by the CA State Fire Marshal.
  • Installation: CO alarms must be installed outside of each separate sleeping area in the immediate vicinity and on every level of the dwelling.

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