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250.50 Grounding Electrode System.
If available on the premises at each building or structure served, each item in 250.52(A)(1) through (A)(6) shall be bonded together to form the grounding electrode system. Where none of these electrodes are available, one or more of the electrodes specified in 250.52(A)(4) through (A)(7) shall be installed and used.

As far as the NEC is concerned if a metal water pipe exists on the premises that fits the criteria of 250.52(A)(1) it must be used. [Linked Image]

These areas that do not use it are either ignoring or amending the NEC.

Bob Badger
Construction & Maintenance Electrician
Massachusetts