First things first
is all that's being done to the cold water piping, then bond it at a convenient and accessible location, using the correct size conductor.
Refer to Article 250-104 for further information regarding this type of bonding.
(conductor size: General; 250-66, multiple occupancies / isolated from other occupants; 250-122).
As to the water well scenario:
If the Well Tubing is Metallic, and the Well is in close proximity to the Building, then by all means, include this to your GES!!!
This will be a Kick-A$$ Deep-Earth Electrode!
It's doubtful that the Well's tubing may ever be changed out for something non-metallic, without the owner's knowledge, so this could kill the idea of supplimenting it with another electrode.
Now on the other hand, the Well might be quite a distance from the service equipment - which could warrant an additional / supplimental electrode, close to the service.
If this was up to me, would do this:
[*] Use an Encased Electrode, which is encased in the foundation of the building where the service equipment is at - AKA "UFER",
[*] Bond it together with the Water Well, to form a single GES.
The Ufer Electrode in list "A" can be either the REBAR or an encased conductor.
These will need to be no less than 20' encased, and at least 24" below finished grade.
Refer to NEC Article 250 for additional information.
You could probably get away with using only the Well for the GES, but this would need to be verified by the AHJ.
BTW: if anyone is not familiar to the terms / words used in this (and other) messages - like for instance "GES", please refer to the ECN Glossary
for reference to these terms.
This can be found at the Technical Reference Area
by using the above hyperlink, or at the URL below: https://www.electrical-contractor.net/ubb/Forum15/HTML/000089.html