BeanAnimal
Premium Member
The bottom line is that IF you use a grounding probe, it MUST be physically grounded to the SAME earth ground that your electrical service is grounded to. You should NEVER ground anything in your home to an individual ground rod or other source. Doing so can result in a very dangerous situation. The cold water pipe IS part of the grounding system that your electrical panel is bonded to, so it is fine unless it is isolated by a section of plastic pipe.