For this job, I rendered leak detection services and detected no leak on the customer side of the meter however, there is a substantial leak on the county side of the meter. We isolated the line from the meter to the main shut off inside there was no water loss. Only the water on the county side was apparent. At the customers behest we did pressurize the main line with compressed air to 40 psi the line held fast no air did escape the line pressurized service line and held for more than 15 minutes.