Plumber in Apache Village, Apache Junction, AZ

Older Apache Junction homes have been repaired repeatedly over decades, and not always by someone who cared about doing it properly. It is common to find galvanized in one wall, copper added in the 1980s, a stretch of CPVC from the 1990s, and transitions made with whatever fitting was on the truck.

Dissimilar metals in direct contact corrode at the joint through galvanic action. Where copper was tied 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.

On any assessment here we check pipe material in more than one location and measure both static and dynamic pressure, because the diagnosis genuinely differs from room to room in houses like these.

Homes of this vintage were typically run in vitrified clay or cast iron below grade, and both have predictable end-of-life failure modes.

Clay does not corrode — a clay lateral can be structurally sound after seventy years — but its joints shift in our caliche and expansive soils, opening gaps that admit roots. In a desert landscape, a leaking sewer joint is the most attractive thing for a hundred feet in any direction, and mesquite, palo verde and the oleander hedges planted along property lines all over this part of town go looking for it.

Cast iron fails from the invert up, and a camera down an old cast iron lateral frequently shows a pipe that looks fine at the crown with no floor left along the bottom.

If your main has backed up more than once, that is a pattern with a physical cause and it deserves a camera rather than another cable service.