Here are your options for adding a grounding conductor to the circuits.
250.130(C) Nongrounding Receptacle Replacement or Branch Circuit Extensions. The equipment grounding conductor of a grounding-type receptacle or a branch-circuit extension shall be permitted to be connected to any of the following:
(1)Any accessible point on the grounding electrode system as described in 250.50
(2)Any accessible point on the grounding electrode conductor
(3)The equipment grounding terminal bar within the enclosure where the branch circuit for the receptacle or branch circuit originates
(4)For grounded systems, the grounded service conductor within the service equipment enclosure
(5)For ungrounded systems, the grounding terminal bar within the service equipment enclosure
250.130(C)(1) allows the connection to the water pipe however it would have to be within 5' of the point of entrance per 250.52(A)(1).
