I live in gulfcoast Florida and have been plagued by persistent (1-2 per year) pinhole leaks in the copper pipes in our home (1990). One interesting aspect is that, so far, all the pinhole leaks have occurred in cold-water lines. I am not sure what that may indicate, but, perhaps, someone has an opinion.
I have read many of the posts concerning the many theories for the causes of this problem, i.e., acicidity, electrical currents, chemicals, minerals, etc. Regarding possible electrolysis and stray electrical currents, I installed a new grounding rod on the main electrical box outside the house (right near where the water line enters, incidently). However, I noticed that my second-floor electric water heater is grounded to the copper piping adjacent to the heater. Having read a lot of posts commenting on the need to isolate electrical currents from the water system, why would a water heater be grounded to the water pipes? Does this make sense? Should it be changed?
Any suggestions for diagnosing and/or addressing this pinhole problem would be appreciated.