One easy way to tell if there's a hidden leak in your home is to check your water level. Record the level once, make sure no one in your house uses the water for a few hours, and then check the level again. If you notice a dramatic change, you most likely have a leak that you need to identify. You can check for leaks in your home by inspecting your faucets and your toilet bowl tank. If everything is working properly, you may still have leaks in your water line and hose bibs. To keep your water bill from going up, you may want to contact a plumber.