Mike,
I believe it is worth mention to the homeowner that pinhole leaks of the speed and aggressiveness he is apparently experiencing may indicate rapid corrosion and the possible leaching of unsafe levels of copper into the water supply. Such leaching can lead to injury or illness. Before anything else, I would recommend a pH check of the water at the supply. This web site has some helpful information: http://www.plumbingsupply.com/cuinfo.html
At least one study on how/why copper pipe pitting occurs suggest factors such as pH, improperly flushed solder flux (where pitting is most often seen on the bottom of horizontal pipe), and "erosion corrosion" which occurs where undersized pipe leads to excessive flow velocity. See: http://www.wsscwater.com/copperpipe/letters/copperpipewp.cfm
An additional factor that should be tested in this situation is the free/total chlorine level, which seems suspect here since several other homes in the area are having the problem and as it has only been a few years since the pipe was installed, suggesting rapid degradation.
Regarding electrical system grounding as a contributor, a summary of various studies/research on this topic can be found here: http://www.toolbase.org/Building-Systems/Plumbing/copper-pinhole-leaks. None of the referenced research include electrical system grounding as a cause.
Best regards,
Loren Malm
Loren Malm
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