Lower your water temperature. Water temperatures above 125 degrees are not needed for most tasks. Consider lowering your water temperature to reduce your energy consumption.
Install a tankless water heater. A tankless water heater is more efficient than a conventional water heater (up to 98% efficiency). It produces hot water on demand eliminating the standby energy used with a conventional water heater. Tankless water heaters can lower your water heating energy bills by 30%-40%.
Install a water heater blanket. Many older water heaters do not have adequate insulation. Installing a water heater jacket and insulating the hot water lines, where they are accessible, will save energy.
Reduce hot water use. The less hot water you use, the lower your energy costs will be - and the more water you'll conserve.
Consider taking showers instead of baths because, generally, showers use less water.
Use low-flow showerheads.
Wash your clothes in cold water. Many modern detergents are formulated to work in cold water, so you won't have to compromise.