Robin2:
Indeed. But plastic piping is very common and it can't provide a GND connection. To be honest the plastic stuff is so convenient it is hard to know why copper would be used....R
We paid $500 extra to get copper pipes when we built our house.
All the other homes in our community have plastic piping.
The community is 25 years old.
5 years ago it was found out that the plastic piping was failing as the chlorine in the water was eating holes on the plastic.
People have to rip the gyproc walls and ceilings to re-plumb.
Also many homes have had crimping fail as the plastic flows in time, then these connections come apart.
Out neighbor had both happen, was away shopping at the time a crimp failed, water caused over $100,000 damage.
Did I mention we paid $500 for copper upgrade.
PS
Hard water easily provides a ground.