San Ramon, CA Building Safety: Carbon Monoxide Detectors (2026)

California's Carbon Monoxide Poisoning Prevention Act of 2010 (SB 183) added Health & Safety Code 17926, requiring carbon monoxide alarms in all residential dwellings with any fuel-burning heater, appliance, fireplace, or an attached garage. This covers virtually every San Ramon home because natural gas is the predominant heating and cooking fuel in the region. Required locations include outside each separate sleeping area in the immediate vicinity of the bedrooms, and on every level of the dwelling including basements. CO alarms must be listed and approved by the State Fire Marshal and comply with UL 2034. Alarms may be standalone, combination smoke/CO alarms, or hardwired units. For new construction, additions, and substantial remodels requiring a permit in areas where CO alarms are required, the alarms must be hardwired with battery backup and interconnected, matching the smoke alarm standard. Standalone battery-powered CO alarms remain acceptable for existing unrenovated dwellings. The Act applies to single-family dwellings, duplexes, condominiums, and multifamily dwellings. Sellers must disclose CO alarm installation at the time of sale, and landlords must install and test CO alarms before tenant occupancy. Failure to install can result in civil penalties up to $200 after a 30-day cure notice under Health & Safety Code 17926.1. The typical lifespan of a CO alarm is 5-10 years; most modern alarms have an end-of-life indicator. San Ramon's Building Division inspects for CO alarm presence during permit final inspections, and the San Ramon Valley Fire Protection District responds to CO alarm activations. Common CO sources in San Ramon homes include gas furnaces, gas water heaters, gas fireplaces and stoves, attached garages where vehicles idle, and portable generators used during PG&E Public Safety Power Shutoff events (generators should never be operated indoors or in garages). HOA community buildings and clubhouses with fuel-burning appliances have the same requirements.