Even if you find your waterline it ain't gonna help you find the leak unless you Plan on digging beside it until you find the leak. There is a place in Memphis called American leak detectors that have the equipment to listen for the leak. If it turns out to be under your house shoot me a Pm before you do a thing. Good luck. One other quick way is to find where your water line come into the house out in front and dig down and cut and cap it then turn your water on and see if your meter is still spinning. If it is your leak is between your house and the meter. If not its under the house. MS one call will only mark from the watermain in the street to the meter. They won't mark from the meter to your house.