Bonding water/gas lines to ground bar in subpanel

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SMB117

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Rochester, NY, USA
Would it violate code or otherwise be bad practice to bond water and gas lines to the ground bar of a subpanel instead of running back to the ground/neutral bar(s) in the main service panel?

Note: The subpanal is fed with 4 wires and the neutral bar is isolated from the ground in the subpanel. The main panel is also properly grounded. However, the water and gas lines are not bonded. --Not sure how this ever passed inspection but it did.

The reason for wanting to bond to the subpanel is that the subpanel is physically located close to the water and gas lines while the main panel is not. On the surface, it would appear that this would work properly/safely but if it is a code violation or bad practice then I want to avoid creating one issue while attempting to fix another.

Thanks for your consideration.
 
As far as the water piping, the short answer is that what you propose would be a violation.
If the water piping qualified as a grounding electrode, you must follow the guidelines in 250.52(A)(1).
If you are simply bonding a metallic water piping system that is nor a grounding electrode, 250.104(A) comes into play.
Only IF you meet the requirements of 250.104(A)(2) it is permissible to bond to a sub-panel.

As far as the gas line is concerned, if it's a "hard pipe" system, 250.104(B) comes into play and in most cases an equipment branch circuit takes care of the bonding for you. If it happens to be CSST flexible gas piping the mechanical Codes come into play and they most often want the gas manifold bonded to the service grounding electrode system.
 
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