Toilet leaks are the most common type of leak found inside the home. Because this type of leak can be silent, it may go unnoticed. Perform a toilet dye test:

• Lift the tank cover.
• Place a few drops of food coloring (or a dye tablet) into the tank.
• Wait 15 minutes without flushing.
• If color appears in the bowl, you have a leak.
  

If you have a leak, check:

• Overflow tube: water should be a half-inch below the top of the tube.
• Lift chain: it should not catch on anything.
• Flapper: ensure it is seating properly.
• Flush handle: make sure it functions correctly.
  
  

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