What the owners noticed
During a dry month, a strip of ground below a low retaining wall in the front yard stays damp, and moss starts growing between the wall blocks. The water bill is higher than usual. Irrigation is the first suspect, since a sprinkler line runs nearby.
Rather than dig, the owners run a staged meter test.
Their meter test
| Stage | Indicator | Meaning |
|---|---|---|
| Everything off | Moving | Water is going somewhere |
| Irrigation valve closed | Still moving | Not the irrigation |
| House shutoff closed | Still moving | Leak between the meter and the house shutoff |
Locating the leak
- First
- A licensed plumber confirms the meter test and traces the main line's route from the meter to the house.
- Next
- The line is found to run uphill of the retaining wall, with the damp area downslope of it.
- Then
- Listening equipment narrows the leak to a section just above the wall.
- Finally
- A small exploratory dig confirms a failed joint on an older line.
Spot repair or reroute
Repair the joint
- Smallest immediate job
- Line beyond the joint is also old
- Further digging near the wall later is possible
- Wall footing must be protected during work
Replace or reroute the line
- New line, possibly by a path away from the wall
- Larger job with permit questions; check with the City of Fullerton
- Reduces chance of another leak behind the wall
- Good time to update the shutoff and regulator
Outcome in this example
Given the age of the line and its position behind the wall, the owners choose a reroute, with the scope and restoration spelled out in writing. A repeat meter test afterward shows no movement, and the damp strip dries out over the following weeks.
Lessons
Common questions
Is this based on a real property?
No. It is an invented example.
Could the wall itself be damaged by a leak?
Saturated soil adds load and can affect drainage behind walls. If you have concerns about a wall, consult an appropriate professional.
What if the leak is on the city's side?
Contact Fullerton's water utility.
General information for Coyote Hills, not a quote or professional advice. In an emergency, call 911.