Plumber in Superior, AZ

Galvanized steel is the defining problem. It corrodes internally, narrowing the interior diameter over decades until a three-quarter-inch line moves the volume of a straw. The symptoms are pressure that has been declining for years and rusty water when a tap has sat overnight. It is not repairable in any meaningful sense — the whole run is failing at once.

A repipe in PEX is the answer, and on a small older home it is usually a one to two day job. PEX matters here because it will not corrode on mineral-heavy water, it needs far fewer fittings on a long run, and it handles the temperature swings these houses see.

Below grade, cast iron and clay laterals in hillside terrain are worth a camera inspection before anyone assumes anything. Ground movement in this topography puts stress on rigid joints that flat-valley construction does not experience the same way.

The other reality of very old housing is undocumented history. A Superior home may have galvanized in one wall, copper added in the 1970s, a stretch of CPVC from the 1990s, and transitions between them made with whatever fitting somebody had.

Dissimilar metals in direct contact corrode at the joint. Where copper was tied into galvanized without a dielectric union, that connection is often the first thing to fail, and it fails from the inside where nobody can see it coming.

When we assess a house like this we check pipe material in more than one place, because what is under the kitchen sink frequently is not what is in the bathroom wall.