California joins twenty-five other states that have adopted some form of requirement for carbon monoxide (CO) alarms in residential construction. Beginning July 1, 2011, at least one CO alarm is required in all existing single-family dwellings with either a fuel-burning heater, fuel-burning appliance, fireplaces, or an attached garage. All other single-family dwellings will be required to have at least one CO alarm installed by July 1, 2013. The new law is referred to as the California Carbon Monoxide Poisoning Prevention Act of 2010. This law makes significant changes to the building codes, the Transfer Disclosure Statement (TDS) and also modifies the Seller's Smoke Alarm and Water Heater Bracing certification statements. This new law was part of legislation authored by Senator Lowenthal, (D) District 27 and was signed by Gov Schwarzenegger in May 2010.