Meter tests, moisture mapping, thermal imaging and listening equipment to locate a leak inside a wall, slab or crawl space.
Fastest: call (833) 490-5225. Or send this and we call you back.
Hidden leak detection is locating a leak you can measure but cannot see, using the water meter, moisture meters, thermal imaging and acoustic equipment. Torrance Water Damage Restoration sends a technician to Torrance and Los Angeles County homes to narrow it down before a wall or slab is opened. Lines are answered 24/7.
The cheapest leak is the one found before anybody cuts. A leak inside a wall, under a slab or beneath a raised floor leaves a small trail: a meter that keeps turning, a warm line on a cold floor, a patch of drywall reading wet at the bottom, a sound in a pipe that carries along the line. Reading those together is what detection is.
Start with the meter yourself. Turn off every fixture and appliance that uses water, then watch the meter dial or the leak indicator for fifteen minutes. If it moves at all, water is going somewhere. Torrance is served partly by the city's own Torrance Municipal Water, which covers roughly 78 percent of the city's land, and partly by a separate investor-owned water utility, so check your bill to see which one reads your meter before you report anything.
Detection is diagnostic work, not repair. The point is to hand you and your plumber a location rather than a guess, and to find out how much of the building is already wet. Where a leak has been running under a floor slab, the slab leak water damage page covers what follows, and a line that has already opened up is on the burst pipe water damage page.
Generally, water on the house side of the meter is the property owner's to repair, while the main and the meter itself belong to the water provider. Which provider serves your address, and exactly where that boundary falls, is on your water bill and with that provider, so ask them before you dig.
Torrance is not served by a single water system. Torrance Municipal Water supplies around 78 percent of the city's land, and a separate investor-owned utility supplies the rest, which means two neighbours a few streets apart can have different providers and different reporting numbers. Its latest water quality report shows most of the supply is imported and the remainder is local groundwater and desalinated groundwater.
If the wet ground is between the street and the meter, report it to the provider rather than hiring anyone. If it is between the meter and the house, it is yours. The water leak in Torrance: utility or homeowner guide walks through how to tell the two apart.
Good equipment in the right hands usually gets within a small area rather than to an exact fitting, and honest practice is to say so. The aim is one small opening in the right place, confirmed by two or three independent readings that agree with each other.
Buildings mislead instruments. A thermal camera reads surface temperature, not water, so a heating duct or sunlight through a window can look like a hot leak. Acoustic equipment hears pipes, framing and traffic as well as escaping water, and moisture spreads sideways so the wettest reading is not always nearest the source.
That is why no single test decides anything. A technician who has a meter drop, a thermal pattern and a moisture map all pointing to the same two feet of wall is confident; one who has only one of the three will say what is still unknown rather than start cutting.
Write down the meter reading with everything off, then read it again a few hours later and keep both numbers. Shut the irrigation controller off in the meantime. Do not open walls or floors looking for it yourself, and keep anything valuable away from the damp area.
Those meter numbers are genuinely useful: a loss rate helps a technician judge whether the leak is small and chronic or large and recent, which changes where to look first. Photographs of any staining, dated as you take them, do the same job for the structure.
If water is appearing fast, or near outlets, the panel, the furnace or the water heater, close the main shut-off valve at the house and leave the detection work until the water is off. A fast leak is no longer a detection job but a mitigation one.
No. Detection locates the leak and measures what is already wet. Repairing the line is plumbing work, and repairing the building comes after drying. Keeping those stages separate means you get an unbiased location and a clean record of the mitigation for your insurer.
The practical sequence is locate, repair, then dry, with the opening left accessible for the drying stage so the same wall is not closed and reopened. The technician will say which order suits your particular leak and whether drying can start before the repair.
Ask any contractor you hire for the repair for their California Contractors State License Board licence number, and check it on the CSLB site. California allows an unlicensed person only a very narrow band of minor work, with no employees, so anyone doing plumbing repairs on your house should have a licence number to give you. Checking it takes a minute and costs nothing.
Do not cut into a wall, ceiling or slab to chase a leak yourself. Electrical cable, gas lines and live water lines share those cavities, and a saw cut is how a small leak becomes a large one. Keep away from any damp area close to an outlet, a light fitting or the electrical panel, and do not run fans or heaters in standing water. If the meter is turning fast and water is appearing indoors, close the main shut-off valve at the house rather than carrying on with tests. Leave the meter box, the main and anything on the street side of the meter to your water provider.
The technician starts at the meter with the house isolated, because that tells you whether water is being lost on the pressurized side and roughly how fast. A supply leak shows here; a drain leak does not, since a drain line only carries water when something is used.
Valves at the house, at the irrigation system and at individual fixtures are closed in turn so the loss can be assigned to a part of the system. Shutting the irrigation alone settles a surprising number of calls, because a stuck zone valve or a broken line outdoors reads exactly like a leak indoors.
A thermal camera shows temperature patterns where a hot line is leaking under a floor or inside a wall, acoustic equipment listens for the sound of water escaping a pressurized pipe, and moisture meters map how far the wet area already reaches. Several readings in agreement are what justifies opening a wall.
When the meter is still and the wall is wet, the water is arriving only when a fixture runs. Fixtures and drains are used one at a time while readings are watched, and a tracer dye can confirm which fixture is feeding the wet area.
The location is marked, photographed and written down with the readings that support it, so your plumber opens one spot instead of three. If the area around it is already wet, the technician sets out what drying the structure will involve and that estimate is explained before any of it starts.
A pressurized line loses water continuously, which is why the meter catches it and why the damage builds steadily rather than in one event. Under a slab the clues are a warm floor over a hot line, damp edges at the baseboard and sometimes a sound carried along the pipe. Inside a wall, the water tends to show up lower and further along than the leak itself, because it runs down the stud bay before it finds a way out.
A drain leak is harder to prove because it only leaks while water is running through it. A shower pan, a tub waste, a toilet flange or a kitchen drain can wet a ceiling or a crawl space for months with the meter perfectly still. These are found by using one fixture at a time and watching the readings, and they are treated as contaminated water once located.
Everything past the house is still on your meter. A cracked lateral, a weeping valve or a broken head that runs after the controller shuts off can account for a whole unexplained bill, and the only visible sign may be a patch of lawn that stays soft through the dry months. Isolating the irrigation at its own valve and re-reading the meter separates this from an indoor leak quickly.
A toilet whose flapper leaks back into the bowl, a weeping dishwasher inlet, or an ice-maker line behind a refrigerator can all lose water quietly. These are the cheapest leaks to resolve and the easiest to miss, which is why the technician checks them before the structure. What they have already damaged is covered on the appliance leak water damage page.
Tell us what's happening and we'll tell you honestly whether it's a quick fix, and what hidden leak detection should cost.
Two water providers inside one city makes the first phone call less obvious here than in most places. Torrance Municipal Water covers around 78 percent of the city's land, and a separate investor-owned utility covers the remainder, so the useful habit is to keep the provider's name and number from your bill where you can find it rather than searching for it while a meter is spinning.
The dry stretch from July to October is the season this work really belongs to. With no rain to muddy the picture, a wet patch of soil, a soft lawn or a damp foundation line means something, and a meter test is not confused by storm water that arrived from outside. That is also when plumbing, appliance and water heater failures make up most of the calls in Torrance, because there is no weather to blame.
Much of the Torrance housing stock came out of the postwar boom and has been remodelled repeatedly since, which matters more for detection than for anything else. Lines have been rerouted, slabs have been cut and patched, additions have been added over old service runs, and irrigation has been rebuilt more than once. Nobody can predict from the street where a pipe runs in a particular house, which is exactly why the work starts at the meter and proceeds by elimination.
Moisture mapping, extraction and slab drying where a line under a concrete floor has been leaking.
Extraction, cavity drying and cleanup after a supply line, fitting or hose fails inside a Torrance building.
Extraction and drying after a washer hose, dishwasher, refrigerator line or ice maker leaks into flooring, cabinets and walls.
Pump-out, debris removal and drying for raised-foundation homes where water, damp soil or a leak has wet the joists and subfloor.
Not sure if you're covered? Check your ZIP code.
A water damage quote is built from the category of the water, how much floor and wall took it on, how many days of drying equipment the materials need, how hard the wet area is to reach, and how much content has to be moved.
A leak between the street main and your water meter belongs to the utility that serves your address; a leak on the house side of the meter is almost always yours.
Turn off every tap, toilet, appliance and the irrigation controller, then find the meter box and look at the small leak indicator, which is often a triangle or a dial that spins with any flow. Note the numbers, wait fifteen minutes to half an hour, and look again. Any movement at all means water is leaving the system somewhere. Note the reading again after a few hours for a rough rate of loss, and keep both numbers for the technician.
It usually means the leak is on a drain rather than a supply line, because a drain only carries water while something is running. The other common answer is rainwater, roof or window intrusion, which makes no mark on the meter at all. A technician tests by running one fixture at a time and watching the moisture readings, and by checking whether the wet pattern matches weather rather than use.
The locating part, yes, in most cases. Meter isolation, thermal imaging, acoustic listening and moisture mapping are all non-destructive, and the aim is to finish detection before anything is opened. Confirming the exact fitting, and repairing it, does eventually require an opening. The difference good detection makes is that the opening is one small hole in the right place rather than several exploratory ones.
In the dry months it is one of the more reliable outdoor signs, because nothing else keeps a strip of soil soft through weeks without rain. It may be your irrigation rather than the supply line, which is why the technician isolates the irrigation at its own valve and re-reads the meter. If the loss stops with the irrigation off, the problem is outdoors and the repair is much simpler.
If the loss is fast, yes: close the main shut-off valve at the house and open a low tap to relieve pressure. For a slow chronic leak most people keep the water on and shut it off only overnight, which also tells you something useful if the meter reading has not moved by morning. Leave the irrigation off either way until the test is done.
Then the job has two halves and you are told so plainly. Detection gives the location; the wet structure then needs extraction and drying, and material that has been wet a long time may have to come out instead of being dried. Call (833) 490-5225 and say what you have seen, including how long it has been going on, and the scope for both halves is explained before anything begins.