That's because a leak may not be obvious.
"If you can find all the leaks in your home, you might be able to save $200 a year on you water bill," said Cheryl Reed with Angie's List.
Some of the possible culprits?
"A leaky toilet tank flapper, dripping faucets - you'd be amazed how much that adds up over time and garden hoses the leak onto the ground that you don't even notice," she said.
And of course, there could be a broken pipe. If you notice a musty smell, or a stain on the ceiling, don't ignore it.
And be aware of these other warning signs:
"Peeling wall paper or even dampness, you'll see it at the wall as buckling possibly or maybe your cabinetry is buckling, that's a good indication, but your nose may lead you there first," Reed said.
If you have a leak and don't deal with it, you could find yourself faced with fighting mold - and that's something you don't want to happen because the cleanup can cost thousands.
target="_blank">Potential Costs of a Plumbing Leak
Plumbing: A simple leak test can help reduce your water bill
target="_blank">6 Signs of a Hidden Bathroom Plumbing Leak