Greg- 250.53(G) says 30" . You could call it a water pipe electrode only if it had water running through it IMHO.

Getting back to Reno's theory, where he thinks maybe one rod that don't meet the 25 ohms or less test is okay at a second building on the property, I have this added comment. If this were true than if I had say five houses on a block that were on the same transformer, only one of them would need to have their Grounding Electrode System meet the ground rod resistance requirement and the rest of the homes would only need to have a single rod electrode (assume water included) because they are only suplemental. And the beat goes on [Linked Image]

George Little