First, make sure all faucets and water-using appliances in and around your home are turned off. Even a small drip will be detected by your water meter. Depending on the meter manufacturer, the meter will have a digital display, sweeping hand or a small dial. If you see any movement on the meter displays or dials water is flowing through the meter meaning these is a leak. Check for moisture or wet spots under sinks, around toilets, at hose faucets, in your yard irrigation, or in other areas where leaks might occur. If necessary, call a plumber for help.