The State of Colorado will require carbon monoxide alarms in some homes starting July 1. The alarms are mandatory because of House Bill 1091, which was passed by Colorado legislature. The new law relates to houses that are for sale and rental housing such as apartments that are leased to new tenants. It requires that sellers/landlords of such homes provide well-functioning carbon monoxide alarms near bedrooms if the home has the following: a fuel burning heater or appliance, fireplace and or attached garage. Mobile and manufactured homes are also covered by the law. Any building permit issued for the construction of a new home or upgrades to an existing home is subject to the same provisions. Roughly 170 people a year die in the United States from carbon monoxide produced by malfunctioning fuel-burning appliances such as furnaces, stoves and water heaters. Thousands more receive emergency treatment.