Is it common practice for the installer to pressure test the water system even if there is no sign of a leak? I get that it is a good idea, I just wondered if your installers typically do this.
I’ve had some experience as a plumber. Part of this experience was working as the foreman laying 6" mains in two subdivisions, we had tees, laterals to the lots, fire hydrants, and isolation valves. The only tests were turning it on and visually looking for leaks on the job on which we had a city inspector watching us, and the other we just buried everything as went, no visual test much less an elevated pressure test… I’d conclude the majority of underground private work is tested only visually at working pressure.