Antioch, CA Building Safety: Carbon Monoxide Detectors (2026)

The Carbon Monoxide Poisoning Prevention Act (SB 183, 2010), codified at California Health and Safety Code Sections 17926 through 17926.2, requires carbon monoxide (CO) alarms in every existing dwelling unit with a fossil fuel-burning appliance (gas furnace, gas water heater, gas stove, gas dryer, gas fireplace, wood stove, pellet stove), attached garage, or similar CO source. Alarm placement must include: outside each separate sleeping area in the immediate vicinity of bedrooms; on every level of the dwelling including basements; and in any bedroom that contains a fuel-burning appliance. CO alarms must be certified by a recognized testing laboratory (UL 2034 or equivalent) and can be battery-powered, plug-in, or hardwired. Many newer models are combination smoke/CO alarms, which is permitted. New construction requires hardwired CO alarms with battery backup under the California Residential Code. Landlords must install and maintain CO alarms under HSC 17926.1 for all rental units, and tenants must notify landlords of malfunctions. Real estate sellers must disclose CO alarm compliance at transfer under Civil Code 1102.6d. Antioch's Building Division enforces CO alarm requirements during permit inspections and resale transactions. Violations of the CO alarm law can result in a fine of up to $200 per violation, with a 30-day grace period after written notice of violation for the owner to correct. The Contra Costa County Fire Protection District responds to CO incidents and provides public education on fuel-appliance safety, including annual furnace inspections.