Check your toilets for leaks. Put a few drops of food coloring in the tank, wait 10 minutes, then check to see if dye appears in the bowl. If it does, you have a leak!
Defrost frozen food overnight in the fridge instead of under running water.
Don't use your toilet as a trash can for tissues.
Install low-flow aerators on sink faucets, and turn off the water while soaping your hands or brushing your teeth.
Limit use of garbage disposals; consider composting food scraps instead.
Replace old clothes washers with new, water-efficient models. Older washers use as much as 40 gallons per load, while newer efficient models use only about 10 gallons!
Replace old plumbing fixtures and appliances with new EPA WaterSense models.
Take shorter showers. A 5 minute shower uses 10 - 15 gallons; a 20 minute shower use 40 - 50 gallons! Save even more by turning off the water while shampooing.
Use the dishwasher instead of hand-washing dishes. Newer models use only a few gallons of water per load.
Wash only full loads of laundry, or use the load size selector for smaller loads.
Wash produce in a pan of cool water instead of under running water.