A water bill that jumped for no reason. A warm spot on the slab. The sound of running water when every fixture is off. Those are leaks, and in Torrance homes they usually hide under concrete, behind drywall, or in a copper line buried in the yard. Alliance is a family-owned plumbing company based in Fontana, serving Los Angeles and Orange County, and we locate the leak before we open anything up. You approve a flat price before we start. No mystery invoices, and no guessing where the water is coming from.
What water leak detection and repair involves
Detection comes first. Guessing costs homeowners drywall, tile and slab they never needed to lose. We start by isolating the system — shutting the main, watching the meter, pressure-testing hot and cold lines separately to tell a supply leak from a drain leak. From there we use acoustic listening equipment to hear pressurized water escaping through concrete, thermal imaging to find hot-water slab leaks by temperature difference, and line tracing to map where the pipe actually runs versus where it was drawn on a plan.
Once the leak is pinned down, repair depends on what we find. A pinhole in copper under a slab may call for a spot repair through a small opening, a reroute overhead through the attic or wall, or repiping of a run that has failed in more than one place. Behind walls, we cut clean access, replace the damaged section in copper or PEX, and pressure-test the line before closing anything. Torrance houses built in the 1950s and 60s often have original galvanized or thin-wall copper, and those tell a different story than a 1990s build — we treat them differently.
Why Alliance for water leak detection and repair
- Family owned and operated since 2010, with over 40 years of combined trade experience across Southern California.
- Licensed contractor, CSLB 1119845, working on plumbing, sewer, water treatment, heating, air and electrical — one team when a leak damages more than pipe.
- Accurate pricing upfront: a flat price you approve before any tool touches your house. No surprises after the fact.
- Same day service, and a 24/7 emergency line for the leaks that will not wait until Monday.
- Non-destructive locating first — acoustic, thermal and pressure testing — so we open the smallest area that will actually fix the problem.
- Free sewer camera inspection, plus Senior and Veteran discounts year round.
Our water leak detection and repair process
- Call and intake. Tell us what you are seeing — bill spike, damp floor, meter spinning, stained ceiling. We schedule same day where we can, and dispatch on the emergency line around the clock.
- Meter and isolation test. We shut fixtures, read the meter, and isolate hot from cold to confirm there is an active leak and which side of the system it is on.
- Electronic locating. Acoustic listening, thermal imaging and line tracing narrow the leak to a specific spot, not a general area.
- Flat price presented. We explain what we found, walk you through the repair options — spot repair, reroute, or repipe — and give you one flat price for each. You approve before we start.
- The repair. Controlled access, section replaced in copper or PEX, connections made and inspected.
- Pressure test and verification. We re-pressurize, re-read the meter, and confirm the line holds before we call it done.
- Cleanup and walkthrough. Site cleaned, work shown to you, documentation left in your hands for insurance if you need it.
What water leak detection and repair typically costs
Detection and repair are priced separately, because they are separate jobs. Locating a leak is a flat diagnostic price quoted before we arrive on site or before we begin, depending on what you describe. Repair estimates range based on where the leak sits and how the pipe was installed: an accessible line in a wall or under a sink is the low end; a slab leak requiring concrete removal, or a reroute through attic and walls, sits higher. Pipe material matters too — a single copper pinhole is a different job than galvanized that is failing in several places at once, where a repipe is the honest answer.
Included in every quote: the locating work, the repair itself, materials, and pressure testing to confirm the fix. Not included: drywall finishing, texture and paint, flooring replacement, or water damage remediation from a leak that ran a long time. We will tell you plainly which of those you are looking at. Estimates on new installations are free — a sudden drop in water pressure is one of the most common reasons Torrance homeowners call us in the first place.
Service areas we cover
- Torrance
- Redondo Beach
- Palos Verdes Estates
- Carson
- Gardena
- Lomita
- Manhattan Beach
- Long Beach
- Los Angeles and Orange County
FAQ
How do I know I have a water leak and not just a high bill?
Shut every fixture in the house and watch the water meter. If the dial still moves, water is escaping somewhere. Warm floors, musty smells, cracked slab lines, and running-water sounds with nothing on are the other common signs.
Can you find a slab leak without breaking up my floor?
Finding it, yes. Acoustic listening and thermal imaging locate slab leaks without demolition. Repairing it may require a small opening in the concrete, or we may recommend rerouting the line overhead instead so the slab stays intact. We give you both prices.
Do you offer emergency water leak service in Torrance?
Yes. Our emergency line runs 24/7 and we offer same day service. If water is actively running into your home, shut the main valve and call us.
Is a slab leak repair or a whole-house repipe the better choice?
If it is a single failure in otherwise sound pipe, repair it. If we find multiple pinholes, corroded galvanized, or a system that has already leaked more than once, repiping costs less than repeated repairs. We show you what we found and let you decide.
Will you check anything else while you are here?
We can. Leak calls often overlap with drain and sewer issues, so a free sewer camera inspection is available on the same visit. Homeowners heading out of town also ask us about shutting the system down safely before a trip, which is worth doing after any leak repair.
Do you work on anything besides plumbing?
Yes — sewer, plumbing, water treatment, heating, air and electrical, all under one licensed team.
If your meter is spinning or your floor is damp, do not wait for it to get worse. Call Alliance at +19516220842 for water leak detection and repair in Torrance, CA. We will locate the leak, give you one flat price before we start, and fix it right the first time — 24/7 on the emergency line, same day where the schedule allows.