If you replace only one thing in your house to save water, think about replacing your showerhead. But how can you tell if your showerhead needs to be replaced or is already efficient enough? Start with a gallon bucket and turn on the shower; if the bucket fills up in less than 20 seconds, it needs to be replaced. When shopping, look for a showerhead that is WaterSense approved; it's a designation from the Environmental Protection Agency that identifies the most water-efficient products in the marketplace. This new showerhead will use less water than your old model.