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Toilet flappers (the valve seal in the toilet tank) can become old and worn-out. When this happens, water can seep through from the toilet tank into the toilet bowl.

A running toilet isn’t just a nuisance; it’s a major waste of water. That constant hissing noise you're hearing means that excess water is leaking from the toilet tank into the bowl, and your utility ...

Add Yahoo as a preferred source to see more of our stories on Google. It Fails The Dye Test: To check your toilet for leaks, put a few drops of food coloring into the water tank. Wait 30-45 minutes.