What would cause a broken water pipe? It is 2 1/2 years old. It is completely erroded at the connection...1/2 of the pipe. The plumber said they used compression fittings, it looks like flux ate it away. The ph balance of the city water is fine, the velocity is fine. If it is electrolosis, wouldn't the plumber know what pipes are compatiable? I am taking the builder, plumber and developer to small claims. The builder and developer are giants in the southern WI area.....I bought my house breand new....don't expect any of the old house issues to arise, yet alone a broken, erroded water pipe after 2 1/2 years! My warranty expired 5 months prior to the pipe breaking.....figures! Not to mention my terrace is all dug up, the bill was $1865!!!! I have the pipe, that is my best defense to show the judge. Theoretically, the pipe should last the lifetime of the house.....not only 2 1/2 years....any suggestions on presenting my case????