We bought our home last August. One of my current worries is the water piping. The home is 10 years old, well water, PEX piping with brass fittings. Not even a few months after we moved in, we had our first leak, was a pinhole leak in the first 90 degree brass elbow fitting where the well water feeds into the house. You can actually see the pinhole in the second photo below. Since that time, I've replaced about 5 other fittings that looked like they were on their way to failure as well. From looking at the pictures, has anyone ever seen this type of corrosion before? I think the problem may be mainly caused from condensation, however the inside of the fittings don't look great either... While it was still hot/humid last summer/fall, I'd frequently find the exposed brass fittings dripping from condensation. Keeping the closet door open and putting a fan moving air around the pipes seemed to help keep that from occurring. I've chosen to replace with plastic fittings as I go, as I'm not sure they could be any worse than these brass fittings. I'm a bit nervous about the possible condition of my pipes in the walls where I cannot see. Do I need to try to hunt down the plumber that is responsible for this? Any other ideas/thoughts? Thanks!