Plumbing in San Jose is a slab-ranch story with an older-bungalow chapter. Hot-water lines under concrete seep until a hallway is warm and the rest of the house looks innocent. That is the leak people ignore because the valley weather does not force a puddle onto a crawl-space floor. Older blocks, including shaded neighborhoods with mature trees, still have galvanized supply and sewer laterals that roots enjoy. Some tract eras used piping that becomes brittle and fails at fittings. Water heaters in garages bake in summer and rust at the base. The fixture you want to change is often attached to a line that will not survive the wrench.
Sort the symptom by system. A single slow tub is a trap or a branch. Several fixtures on the low side of the house are a lateral, especially if trees stand over the route to the street. Gurgling can be a vent. No hot water is a heater, a dip tube, or a shutoff that failed halfway. Warm tile is a slab leak until proven otherwise. Angle stops under lavatories seize in hard-enough water and snap when they are finally forced. Irrigation tie-ins on the same supply confuse a leak hunt if you forget to mention them. A re-pipe of one bath and not the rest leaves mixed metals in the wall.
Summer is when these houses use the most hot water and when garage heaters work hardest. Winter rain is when a cracked lateral that was marginal all year finally backs up into a shower. Clay soil moves. Joints that were tight in a dry August open after the ground soaks. Describe the season when the problem shows up. It is a clue, not a mood. Access on a slab is the job: sometimes the repair is a reroute through walls and attics rather than a trench across a finished floor.
Call and locate the failure. Warm floor, slow drain, rusty water, or a heater leaking onto the garage slab are different openings. Mention trees, a recent fixture change, and whether the house is a ranch on concrete. San Jose plumbing work should start from the slab and the soil, not from a fog-city pipe story.
Call the number on this page.