In general, in the US, it is required to bond a metallic water pipe system (e.g., copper or galvanized pipe) to the electrical grounding system. This is usually done near the service entrance so that the connection can be verified by direct inspection.
“If metal water piping systems are not bonded to the electrical system in a way that meets the requirements of the Code, they can present a fire or shock hazard within the building or structure because they could become energized. ...”
In some jurisdictions, inspectors may want you to bond around nonconductive plumbing connectors of the kind you mentioned to ensure the whole pipe system is bonded. In particular, around the hot water heater.
In general, in the US, it is required to bond a metallic water pipe system (e.g., copper or galvanized pipe) to the electrical grounding system. This is usually done near the service entrance so that the connection can be verified by direct inspection.
For (much) more on this, see: https://iaeimagazine.org/magazine/2005/11/16/bonding-metal-p..., in particular the paragraph starting “Let’s take a closer look” —
“If metal water piping systems are not bonded to the electrical system in a way that meets the requirements of the Code, they can present a fire or shock hazard within the building or structure because they could become energized. ...”
In some jurisdictions, inspectors may want you to bond around nonconductive plumbing connectors of the kind you mentioned to ensure the whole pipe system is bonded. In particular, around the hot water heater.