Grounding multiple panels

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I am upgrading the service in a three family dwelling. 1 house panel 3 100 amp panels. what would be the best way to connect all panels to the #4 ground to the water pipe. Is a small copper bus acceptable with crimp on terminals ,1 from each panel and then 1 #4 going to the water pipe or do I have to take a #4 from each panel to the pipe?
 
Size the GEC to the water main according to the service entrance conductors then tap off to each panel.
 
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