The #1 water waster in your home is the toilet. A leaking toilet can waste 15,000 gallons of water a month. To check if your toilet has a leak, place several drops of food coloring in the toilet tank. If the color seeps into the toilet bowl within 30 minutes without flushing, your toilet has a leak. Water efficient toilets use 1.5 to 2 gallons per flush; older models can use up to 8 gallons per flush. Newer toilets cut total indoor water usage by 30%. Leaks in your home can also squander lots of water and leave your wallet lighter. A leak the size of a pinhead can waste 360,000 gallons of water a year. That is enough water to fill 20 average sized backyard pools.