Leak Detection in Los Angeles, CA
Unexplained water use, damp spots, and the sound of running water can point to a hidden leak. We locate the source with minimal disruption.
When to call for leak detection
Common signs we see on residential and commercial properties:
Where hidden leaks actually happen
The useful first split is supply versus drain. Supply lines are under constant pressure, so a supply leak runs continuously whether or not anyone is using water — that is what drives an unexplained bill and what makes a meter keep moving overnight. Drain lines only leak while something is draining, so the evidence is intermittent and easier to miss.
After that it is a question of where the line runs. Leaks inside walls announce themselves through staining and soft drywall. Leaks under a slab often show as a warm floor area on the hot side, or as the sound of water with every fixture closed. Leaks on the service line between the meter and the building may never show inside the house at all — the water simply goes into the ground.
Each of those is found a different way, which is why locating the leak is its own job rather than a step in the repair.
How a leak is located without opening walls
The sequence starts with the meter, because it answers the first question cheaply: is water leaving the system with everything shut off? A meter that continues to move under those conditions confirms a pressurised leak before anyone touches the building.
From there the system is divided. Shutting isolation valves section by section narrows the leak to a zone — inside versus outside, hot versus cold, one branch versus another. That single step removes most of the guesswork.
Only then do the tools matter. Acoustic equipment picks up the sound a pressurised leak makes escaping a pipe, which carries further through metal than most people expect. Thermal imaging finds the temperature difference a hot-side leak creates through flooring. Pressure testing isolates a suspect section and proves whether it holds. Used in that order, they usually place a leak closely enough that only a small area needs opening.
The test you can run before calling
Turn off every fixture and appliance that uses water, including ice makers and irrigation. Read your meter, wait an hour without using any water, and read it again.
If it has moved, you have a leak on the pressurised side, and it is running continuously. If it has not, the loss is more likely on the drain side or intermittent, which points somewhere different.
It costs nothing, takes an hour, and it tells us something genuinely useful before we arrive.
What a hidden leak costs while it runs
A supply leak does not pause. A drip that would be trivial at a faucet becomes significant over weeks when it runs continuously into a wall cavity, under a slab or into soil.
The water is usually the smaller cost. Sustained moisture damages framing, subfloor, cabinetry and finishes; under a slab it can undermine the material supporting the concrete. The gap between finding a leak early and finding it after visible damage is generally the difference between a repair and a restoration.
Leak detection in Los Angeles homes
Plumbing here reflects when the house was built. Mid-century tracts commonly used copper, which is long-lived but thins where it rubs against a slab or a framing member. Older properties may still carry galvanised steel, which corrodes from the inside and eventually fails at the threads. Post-war slab-on-grade construction puts supply lines under concrete, where a leak is invisible until it is warm underfoot.
Soil movement is the local accelerant. Seasonal shrink and swell, plus hillside settling, work steadily on joints and on any pipe held rigid across a moving plane.
Leak Detection FAQ
My water bill jumped but I cannot see anything wrong. Is that a leak?
It often is. A pressurised leak runs continuously and can lose a meaningful volume without ever surfacing where you would notice. The meter test above will usually confirm it in about an hour.
Do you have to cut into walls or floors to find it?
Not to find it. Meter checks, valve isolation, acoustic listening and thermal imaging are all non-destructive, and the point of using them is to narrow the location before anything is opened. Access is usually needed to repair the leak, not to locate it.
What does a warm spot on the floor mean?
It usually indicates a leak on the hot-water line beneath the slab, since escaping hot water heats the concrete above it. That points toward slab leak repair rather than a fixture problem.
Could it be the irrigation rather than the house?
Yes, and it is worth ruling out early. Irrigation runs on the same service in many properties, so a valve that does not fully close reads at the meter exactly like a leak indoors. Isolating the irrigation and repeating the meter test separates the two.
How soon can someone come out?
We are available 24 hours a day, Monday through Sunday. Call (323) 303-0060 and we will tell you honestly when we can be there.
Our process
Ready for leak detection?
Call now or request service — we serve LA & the San Fernando Valley.