Plumber in Apache Villa, Apache Junction, AZ

Galvanized steel was standard supply pipe before copper took over, and it fails in a completely predictable way. The zinc coating wears, the steel underneath corrodes, and rust builds inward from the pipe wall. A three-quarter-inch line becomes functionally a half, then a quarter. Water still comes out, so nobody treats it as urgent — but the volume the house can deliver has been quietly shrinking for thirty years.

The tells are consistent: pressure that drops noticeably when a second fixture opens, hot water that is weaker than cold because the water heater side has more scale and corrosion, and brown or orange water when a tap has sat overnight and clears after a minute.

There is no repair. Cleaning aerators helps a little. Replacing a section just moves the restriction. A repipe in PEX is the honest answer, and the improvement is immediate and dramatic — people describe it as having a different house.

The other reality of an older Apache Villa home is that it has been repaired repeatedly, and not always by someone who cared about doing it correctly. It is common to find galvanized in one wall, copper added in the 1980s, a stretch of CPVC from the 1990s, and transitions between them made with whatever fitting was handy.

Dissimilar metals in direct contact corrode at the joint through galvanic action. Where copper was tied directly into galvanized without a dielectric union, that connection deteriorates from the inside where nobody can see it, and it is frequently the first thing to leak.

When we assess a house here, we check pipe material in more than one location, because what is under the kitchen sink often is not what is in the bathroom wall. And we camera the drain before assuming anything about the sewer, since cast iron of this vintage frequently has no invert left.