Thank you for your response.Almost always, when I hear green corrosion, pin holes in copper pipes its water corrosion. Typically blame is pointed at the water line being grounded to the electrical service but that is not an issue.
1. Some water tends to be very aggressive and attacks the protective oxide film formed inside copper pipes. My water is typically a pH of 8.0 and our water supplier adds caustic (sodium hydroxide) to raise the pH to 8.5. This higher pH will maintain the oxide film on copper and lead solder.
The EPA passed the Lead and Copper rule in 1991, our corrosion control treatment started in 1999 and testing since then has shown it to be very effective (what happended in Flint is the water source was changed and there was no corrosion control, plus they have lead service lines, not just lead solder). https://www.epa.gov/dwreginfo/lead-and-copper-rule
Your water supplier will have a consumer confidence report on your water. Get that and find out how they address corrosion control
2. Pipe corrosion is caused by DC current, not AC. I have the definitive American Water Works Study that reviews this issue stating its DC current, which is very uncommon in homes.
Please report back on your water pH. You said the water was "acid" meaning a pH below a base of 7. My water is base, IE opposite of acid.
Edit sorry I reread your detailed post, you said your water was alkaline - do you mean base?
Yes, the water had a pH of between 7.5 and 8.5. Again, same water supply is going to all neighbors, and we live in a major city, living feet from each other. We are all on municipal water supply. None of the neighbors have this issue. Water has been sent of for chemical analysis multiple times, and nothing ever comes back as being problematic. State’s water quality commission has tested water as well, and it does not present an issue which would cause the problems we are having.