Uniform construction means uniform failure timing. The copper in a West Fullerton street was installed within a couple of seasons of itself, sits in the same clay, and carries the same hard water at 14 to 25 grains per gallon.
Sixty years on, those pipes reach the point of pitting corrosion at broadly the same time. It is common for us to work multiple slab leaks on one street within a season, and homeowners often tell us a neighbour had the same thing last year.
That is worth knowing rather than worrying about. It means the early warning signs are worth taking seriously in this area specifically — a warm floor spot, an unexplained water bill jump, running water heard with everything off — because your house is on the same clock as the ones either side of it.
The rest of the profile is the standard tract-era mix: garages with water heaters at or past replacement age, original sewer laterals under mature street trees, and appliance supply connectors that were never upgraded from rubber.