For this job a rendered leak detection service for homeowner, I isolated the Watermain service between the water meter and the shut off inside the garage, and determined the leak was indeed on the water main service. Throughout my investigation I listened to the unpaved areas in the yard along the water, main service and detected no sound or signs of leak, then switched to my concrete microphone and discovered the leak is under concrete just before it disperses underneath footer of the home, no leak was detected in any unpaved areas,in the yard or any other areas inside the home.