Grounding wire, Copper Pipe, and PVC
I have a grounding wire that is connected to a copper pipe in my house.
Originally, I imagine said copper pipe connected all of the way to the pipe which goes into the ground towards the well.
However, at some point, the previous home owners installed a filtration system and replace a lot of the copper with PVC pipe, so it goes Copper > PVC > Copper > Ground Wire
Is that ground wire still useful? Or do I need to extend it to where the original copper pipe extends into the ground towards the well?
A ground that is insulated from the ground is not a ground. So yes you will have to extend the ground cable to where the metal pipe goes into the ground.
Not that I am aware of but I haven't looked yet, I'll see if I can find something