California adopts first statewide green building code

Taking effect January 2011, the nation's first mandatory green building code – dubbed “CalGreen” – lays out specific constraints for newly constructed buildings. It requires builders to install plumbing that cuts indoor water use by as much as 20 percent, to divert 50 percent of construction waste from landfills to recycling, and to use low-pollutant paints, carpets, and floors. It also mandates inspection of energy systems to ensure that heaters, air conditioners, and other mechanical equipment are working efficiently. And for non-residential buildings, it requires the installation of water meters for different uses.