Steve Barker wrote:

The purpose of attaching a ground wire to a water pipe is not to
provide a ground for the electrical service, it is to provide a
ground for the plumbing system.



Depends.

In the town i have rentals in, they ONLY require the copper pipe
coming in the house to be the ground. Any additional rods or bonding
is optional. They also REQUIRE ALL replacement water service entrance
pipes to be copper

The way I heard it, bonding to a water pipe protects you from a floating
neutral as you are skinning muskrats in the sink. As you prepare to process
the muskrat guts in the disposal, while holding a poorly-insulated electric
carving knife, you reach up and touch the metal faucet...

Contrary to popular thinking, muskrat entrails are an excellent conductor,
as proved by real science.