One of the easiest things a homeowner can do to understand if they have a water leak or not is to use the water meter as a measuring device. If all of your appliances and fixtures are turned off, including your water heater, and your water meter continues to run, it’s a tell tale sign that you have a leak. This is also the most important time to call a plumber and schedule a service call so that the plumber can perform a leak detection service and find the source of the leak.