About this example

This scenario is fictional. It is based on a pattern that comes up in slab-on-grade homes across North Orange County, where some supply lines run under the concrete floor.

How the clues show up

Week one
A family notices a tile near the hallway bathroom feels warm in the morning.
Week two
The water heater seems to run more often, and the water bill is higher than the same period last year.
Meter test
With everything off, the meter's leak indicator moves steadily.
Isolation test
Closing the water heater's cold inlet stops the indicator, pointing to the hot side.

Finding and fixing the break

Illustrative example. Not a real job or customer.

The family keeps the heater's inlet closed between uses and calls a licensed plumber who offers leak detection.

  1. The plumber traces the hot line's path under the slab from the heater toward the bathrooms.
  2. Acoustic listening and thermal imaging point to the same spot near the warm tile.
  3. The plumber explains two options in writing: open the slab at that spot, or reroute the hot line through the attic and walls.
  4. Because the house is on its original under-slab copper and this is the first leak, the family weighs both carefully.

In this example the family chooses a reroute to avoid opening tile floors and to retire the under-slab hot line, accepting drywall patches in a few places.

How the options looked to this family

Open the slab

  • Targets the exact break
  • Tile must be removed and replaced
  • Under-slab line stays in service

Reroute overhead

  • Avoids breaking concrete
  • Drywall openings instead
  • Retires the aging under-slab hot line

Lessons from this example

  • A warm floor is worth a meter test
  • The heater inlet test quickly separates hot from cold
  • Leak detection kept openings to the minimum
  • Both options were laid out in writing before any work
  • The family asked whether the work needed a city permit

Common questions

Is this based on a real household?

No. It is an illustrative example only.

Why choose a reroute after only one leak?

Some owners prefer to avoid repeated floor openings in older under-slab lines. Others repair the spot first. Both are reasonable; ask a plumber about your pipe.

Could the family keep using hot water?

Only by opening the heater inlet when needed and closing it after, to limit water lost under the slab.

General information for Fullerton, not a quote or professional advice. In an emergency, call 911.