One of the first things to be ascertained before attempting to repair a leak is to safely isolation the water supply.  Knowing how to stop a leak requires identifying the location of the stopcock.  However,  if the plumbing is something that is familiar to you there may be an easier way to shut down the water supply. There are three common locations where a properties water supply can be turn off.  The incoming supply starts it journey outside the property before arriving at a designated outl...