If every home in the United States installed WaterSense labeled faucets or faucet aerators in the bathrooms, it would save 60 billion gallons of water annually, saving households more than $350 million in water bills and about $600 million in energy costs to heat their water. Additionally, water and waste water utilities would save 200 million kilowatt-hours of electricity normally used for supplying and treating that water. The WaterSense website has a complete list of WaterSense labeled products, http://www.epa.gov/watersense/pp/index.htm
Source: EPA Water Headlines