When we arrived on the property, we checked the meter for spin, and it was in fact spinning. The water fed two buildings, and when we shut the back building, we were able to isolate the leak to the front building itself.
The building had offices upstairs and a single shared bathroom. There were no water outlets in the offices, and no water was showing from the upstairs leak. Typically, a 2nd level leak would be visible, in this case, it was not. That’s a good thing for the repair crew, to avoid an upstairs bathroom leak.
In the downstairs bathroom, the fixtures had been removed and we were left with a hot and cold water valve set-up and a valve that went to the toilet. By simply listening on the valve stems with out Pipe Probe, found in the Plumbers leak Detection Kit, we were able to hear the vibration of water movement on the cold water side. We continued to listen on the toilet stem, but ultimately, the sound was revealing itself at the sink. Clearly defined, about 8 inches from the wall, we heard the leak at the sink and marked the area for repair. It was done in a day before they refinished the bathroom and the customer couldn’t have been happier.