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?