San Marino properties sit on large lots with mature landscaping and substantial houses, many of them decades old with plumbing systems that have been extended over the years.
Large mature trees are a specific factor. Roots find drain lines and supply lines, and they do it slowly enough that the failure appears long after the tree was planted.
What goes wrong in San Marino homes
Root intrusion into sewer and drain lines is a recurring cause, and the result is a backup rather than a leak. Those are contaminated losses and they are handled to a higher standard.
The other is irrigation on a large landscaped lot, running near foundations and running frequently, plus the long supply runs that a bigger house requires.
Tree roots have got into the drain line. Is the cleanup different?
Yes, because anything that comes back up a waste line is contaminated. Porous materials it touched come out rather than being dried, and the area is treated rather than just cleaned.
How do I stop this happening again?
Camera the line to see the condition rather than guessing, and deal with the pipe rather than only clearing the blockage. Repeated backups are a pipe problem wearing a blockage costume.