It takes lots of energy to pump, treat, and heat water, so saving water reduces greenhouse gas emissions. Saving water around the home is simple. Three percent of the nation's energy is used to pump and treat water so conserving water conserves energy that reduces greenhouse gas pollution. Reduce the amount of waste you generate and the water you consume whenever possible. Pursue simple water-saving actions such as not letting the water run while shaving or brushing teeth and save money while conserving water