You can use water pipes for grounding purposes, but…

Water Pipes for grounding Water pipes have been used extensively in the past as a grounding electrode. Water pipe connections are not testable and are unreliable due to the use of tar coatings and plastic fittings. City water departments have begun to specifically install plastic insulators in the pipelines to prevent the flow of current […]

from Energy and Power – EEP – Electrical Engineering Portal http://ift.tt/1Mz2W2h
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