Copper Pipes: The Silent Destroyer - Why They Corrode and How to Prevent Disaster - HomeFixMagic
Copper pipes have long been the material of choice for plumbing systems due to their durability, flexibility, and resistance to corrosion. However, under

Hello; Found the above link. Has some interesting insights concerning copper water pipes. Two things stand out. One being the idea that too much solder when joining pipes can cause problems. Have any of the pipes been repaired lately?
The other is how the pH can affect the copper oxide layer. Made me think of the Flint Michigan issue with lead pipes. The lead is toxic but when used as a water pipe a layer forms on the inside of the water pipes. That layer coating protects the water by insulating the water from the lead pipe. Flint changed the way they treated the water which removed that protective layer and allowed lead to leach into the water. Seem things like high pH can do something similar to the copper oxide layer which lines the inside of copper pipes.
My long term plan is to replace the copper with Pex pipe. I already did so when I had to relocate an outside frost proof spigot. I used a shark -bite to attach the copper to the pex.
Now that I think of it the house i lived in and kept my first tanks back in 1959 also had copper pipes. I had snails then also.
Have you contacted the water company to see if they are doing anything different? You should be able to get a water quality report as well.