Costa Mesa Slab Leak Detection & Repair
A patch of floor that is warm underfoot. A water bill that went up and stayed up. A meter creeping around with every faucet closed. Costa Mesa slab leak repair starts by identifying which buried line has failed, because every decision after that depends on the answer. Where the copper was poured into a tract-era floor, a new line carried overhead beats breaking concrete to close one pinhole.
- 60-min response window
- Overhead PEX reroute on aged copper
- Tile & flooring untouched
- CSLB License #920054
Said plainly at the start: slab and water lines are the work. Pool and spa leaks, irrigation, and natural-gas lines sit outside it. Anything inside the slab, beneath the foundation, or in a wall feeding a fixture is ours.
Slab-era concrete, and what has happened underneath it.
The slab in a Costa Mesa house has a date, and it is usually a post-war one. The city incorporated in 1953, and the Census puts the median build year at 1972, with 68 percent of the housing finished before 1980. Copper poured into a floor in those years has carried water for five to seven decades with nobody able to see it, inspect it, or service it.
That matters because a buried line ages as one piece. Every foot has sat in the same soil, at the same temperature, carrying the same water, since the day it went in. The length that fails first is not the only worn length, it is simply the one that surfaced. Which is why the useful question is what to do about the run, not how to close the hole.
On copper of that age the answer is nearly always to take the buried line out of service rather than open the floor to reach it. Breaking concrete leaves the rest of the run untouched and thin, and the equipment doing the breaking sends shock along it. A replacement carried overhead through the attic ends the leak by retiring the old line. That has been the approach here since 2008.
No Callout Charge
The service call costs nothing. No trip charge and no add-on before anyone has looked at the house.
Always On Call
Nights, weekends, holidays, a slab leak does not wait. We isolate the line, cap the water, and stop the damage now.
Written Estimates
Reroute scope in writing, with the diagnostic behind it. The price lands before any drywall opens.
Six versions of the same call, priced differently
Every call here comes down to one question asked in different circumstances: can the failed line be reached without touching the floor. The concrete is never the answer, it is the obstacle. What changes between these six is scope, and scope is the part you pay for.
Locating The Failed Line
We open with acoustic equipment and a pressure gauge, and bring thermal imaging in only where it resolves something the ear cannot. The whole exercise answers one question: which buried run has gone. We open nothing to find out.
- Hot side or cold side established first
- Confirmed by listening at the pipe
- Thermal used only to corroborate
Overhead Replacement Line
What we recommend once we have confirmed a failure below concrete. We cap the old run at both ends and leave it in the floor, then take a new PEX-A line through a wall and across the attic. Your flooring stays where it is.
- Two small drywall openings, patched
- PEX-A routed through the attic space
- Pressure tested, warranted long term
Reachable Repairs
Not every suspected slab leak is one. A weeping valve under a cabinet, a fitting at the heater, a line in a wall cavity feeding a faucet: we treat those as ordinary repairs and finish them on the visit that found them.
- Worn section removed and replaced
- Copper or PEX, the homeowner's choice
- Tested before anything is closed up
Hot Side First
Heat shortens copper's life, so hot runs fail earlier and more often. A few minutes at the heater lets us isolate one side of the system from the other, which keeps us off a line that was never in trouble.
- Inlet closed to halve the system
- Suspect run confirmed by ear
- Thermal only where it corroborates
Full PEX Repipe
Where two runs have gone, or this address has been through it before, we replace the entire system in PEX and close the subject. We work overhead in phases and never cut the slab for it.
- Hot and cold renewed in PEX-A
- Two to four days, worked in stages
- Pressure regulator checked at the same time
Claim Support
Few residential claims are examined as closely as a slab leak with water damage behind it. We build the evidence pack and submit it ourselves, rather than handing you an invoice and a phone number.
- Cause of loss written as carriers expect
- The case for replacing rather than patching
- Billed to the insurer where the policy allows
Locating it with the floor left alone.
We find it with the floor still intact, using six fixed moves that start at the water meter. By the end we can tell you which line has gone, which side of the system it sits on, and whether it needs bypassing. We cut nothing to reach that answer.
That is the whole reason these jobs end in a drywall patch instead of a relaid floor, and it is why nobody turns up here with a breaker and a theory.
Everything begins at the meter
House shut down, nothing drawing, dial observed. Still means nothing is escaping. Drifting means something is, and nothing beyond that needs establishing yet.
Is it the building or the service line
Closing the main isolates the house from what runs in from the street. A dial that settles puts the loss indoors, concrete included. A dial that keeps drifting puts it outside, which is a different job entirely.
Which side of the heater
Shutting the cold inlet halves the system. A signal that fades points at the hot run, one that stays points at the cold. A warm patch underfoot suggests but does not settle, so the listening gear does.
Sound taken off the metal
Valves, the heater, any run we can reach. Never through the slab, which muffles the signal and moves its apparent origin. The aim is not a spot to open. The aim is a line to take out of service.
A gauge to confirm it
Onto a hose bib, main closed, needle watched. A steady drop proves independently that water is going somewhere, and the speed of the drop hints at how much.
Thermal if it settles anything
A hot failure beneath tile or stone sometimes reads plainly on thermal. It backs up the acoustic finding rather than replacing it. Most jobs finish without it being needed.
Nobody cuts a floor open to reach one pinhole.
When the failure sits under concrete it gets bypassed rather than patched through the slab. Two reasons drive that, and both are explained before anybody signs anything.
The first is age. Copper that has spent sixty years under a tract-era floor is worn along its full length, so when we close the hole that surfaced we only set the date of the next one. The second is access. Our saws and breakers transmit shock into pipe that is already thin, which is how the cheapest option in March becomes the most expensive one by December.
A new line above the floor
We run PEX up inside a wall, across the attic and back down at the fixture. We cap the old copper and leave it buried. We cut no concrete, transmit no shock, and expose nothing new.
Patching through the concrete
If we close one length through the floor, we leave every other foot of sixty-year-old copper exactly as it was. The next failure usually lands on the same run, and reaching the first one can be what triggers it.
Retire the buried line overhead
For any pipe failure under the concrete, hot or coldWe reroute by taking the failed run out of service and carrying a new PEX-A line through the walls and attic instead. Our argument for it is structural rather than cosmetic:
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The rest of the buried run stops mattering We replace the vulnerable line rather than seal the one point that happened to show itself.
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We put no machinery alongside spent copper Cutting equipment sends vibration through the floor, and patching what is visible can start what is not, a few feet away. Working overhead removes that risk.
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We leave the floor as we found it Two modest drywall openings, no tile lifted, no concrete to pour back, no finish work to redo later.
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We can warrant it New PEX carries long-term coverage on parts and labor. A patch set into sixty-year-old copper does not, and anyone offering you the same coverage on one deserves a question.
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Nobody may cut a post-tension slab in any case We treat conventional slabs the same way, so what is under the house does not change what we recommend.
When a repair is genuinely reachable
When the leak is NOT in the slabOne situation puts a straightforward repair back on the table: the failure was never below the floor at all. It sits somewhere we can reach without concrete, and our diagnostic usually shows that within the hour.
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In the open at a valve Under a sink, behind a toilet, at the laundry connection. We take the worn fitting off and put a new one on.
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At the water heater A flex connector, a union, the inlet itself. Visible, and we repair it without opening anything.
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In a reachable wall cavity A pinhole on a faucet feed, clear of the floor. We make a small opening, replace the section and patch it.
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Through the slab, never Where our diagnostic puts the failure underground, we leave the concrete shut and bypass the line. The price does not change that.
If somebody proposes breaking your floor open to close one hole in sixty-year-old copper, get a second opinion before agreeing. Neither the arithmetic nor the risk to what remains points that way.
Our thanks to the people who keep Costa Mesa running.
A 5% discount (up to $200 off) for first responders, military, healthcare, teachers, seniors, and nonprofit staff serving Costa Mesa and the surrounding area. Mention "Community Heroes" when you call our dispatch; we'll take care of the rest.
- First Responders
- Military
- Healthcare Workers
- Seniors
- Teachers
- Nonprofit Employees
First Responders 
Military 
Healthcare Workers 
Seniors 
Teachers 
Nonprofit Employees 
Applies to repairs over $500. Cannot be combined with other promotions. Proof of eligibility may be requested at the time of service.
The Costa Mesa neighborhoods where we do slab work weekly.
Sixteen square miles with the 405 across the top and the 55 down the middle, which keeps every part of it close to a main road. Harbor Boulevard and Fairview Road run north and south, Adams Avenue and Baker Street cross them, and 19th Street covers the older Westside grid. Both 92626 and 92627 are inside the response window.
Irvine Office
Irvine, CA 92602
Neighborhoods we service for slab leaks
The parts of the city we are in most weeks. If yours is close by and not listed, we still cover it, just call.
Slab leak specialists serving Costa Mesa since 2008.
Cali's Choice
Leak detection and slab leak specialists working Costa Mesa and the surrounding area.
Slab leaks located and repaired
Spot repairs and overhead reroutes, combined.
California License
C-36 Plumbing classification. Bonded & insured statewide.
Leak detection
Free when we do the slab repair.
What homeowners say about our slab work.
Verified Google reviews from slab leak jobs handled by the team that serves Costa Mesa.
I am so happy I called Cali's Choice Plumbing. I could hear water running in my bathroom wall and it turned out that I had a slab leak. I called and talked to Ginny. John B came out to give an estimate and then to do the work. They were both so amazing. Ginny was kind and very helpful. John explained everything throughout the process. He was very knowledgeable and helpful.
We had a slab leak and Sergio was so helpful! He came out and found the location of the leak and explained his proposed plan to fix the leak in the cheapest way possible. From start to finish I got the feeling he genuinely cared and wanted to help us. When he came back to fix, he stayed till after 8pm to see to it that we could have running water.
A water leak under our slab was carefully fixed by Sergio and Levi. They worked for 11 hours straight so that we could have running water that evening .Estimates were reasonable, repairs were explained, areas were cleaned upon job completion…what more can one ask for? A+ all the way!
The slab claim is ours to run, not yours.
The slab claim is ours to run. We document the cause of loss, photograph the copper that failed, itemize the scope and send the whole thing to your adjuster. You assemble nothing and you chase nobody. We stay on it until it settles.
It matters because a slab leak with water damage behind it draws more scrutiny than almost anything else a household policy covers. The carrier wants particular language and a complete file, and anything missing leaves it sitting while the damage spreads.
- Cause of loss, written up. Sudden and accidental language, which side of the system failed, the build year and the pipe material, in the form carriers expect to read it.
- Photographs, in sequence. The locating data, the access point, the failed copper and the damage around it, time-stamped and captioned.
- An itemized scope. Reachable repair or overhead replacement, priced line by line, with the diagnostic reasoning attached.
- Contact with the adjuster. We deal with them directly. Questions get answered and further evidence goes across without you chasing it.
- The case for replacement. Carriers wave a patch through and then query a reroute. The reasoning for replacing aged copper goes in writing, with the diagnostic behind it.
What slab leak repair in Costa Mesa is likely to cost.
We cannot give you an honest figure before we have seen the house. Two slab jobs on the same street can differ threefold depending on whether one run has failed or several, whether the house is single or two story, and what the attic above is like to work in. We set out every factor that moves the number, so the written quote reads as arithmetic rather than a verdict.
The variables behind the figure
One run, or the whole system
A single line we take overhead from the heater to one wing is the common job. Two runs, or a complete repipe, scale from there.
The age of what is buried
Copper poured into a 1950s or 1960s floor that has failed once is usually worn along its length, which can turn a single reroute into a whole-house answer.
Distance and attic conditions
How far we have to run the replacement and how workable the space above it is both land in the labor. A single-story ranch is usually straightforward. Two stories with a shallow attic is not.
How many openings are needed
Two drywall cuts covers most jobs. An awkward route wants a third. We quote the patching and texture matching with the work rather than adding it after.
Damage already done
Anything soaked before we arrive is a separate scope for a different trade. We document it for the claim and keep it off the plumbing invoice.
How do I read our Mesa Water meter to check for a slab leak myself?
Mesa Water says its meters read left to right, like a car odometer, in cubic feet. One cubic foot is about 7.48 gallons. Write down the numbers, use no water at all for half an hour, then read it again. If the count went up, water is escaping somewhere, and it’s time to call us.
We live in 92627. Are homes on our side of Costa Mesa older?
Slightly. The Census puts the median home in 92627 at 1970 and in 92626 at 1973, against 1972 for the whole city. Three years apart is not much. On either side, most slabs hold copper that’s been in service for around fifty years, so we size up the entire buried run, not just one spot.
Our water bill spiked and we suspect a leak. Is there a deadline to question it?
Yes, and it’s short. Mesa Water says any dispute of a bill must be reported within 10 business days of the billing date, or the bill is treated as accepted. Call Mesa Water customer service promptly, then call us to find the leak. Our written findings can help explain what happened.
Water is coming up through the floor right now. What should I do first?
Close the main house valve to stop the flow, then move rugs, boxes and furniture off the wet area. Unplug anything sitting near the water. Call us and tell our dispatcher what you see. A technician arrives within 60 minutes, finds the failed line, and makes it safe before any repair plan is written.
Is slab leak detection really free in Costa Mesa?
Yes, when we do the repair. The visit costs $0 to start, we find the line that failed, and then you get a written quote for fixing it. Nothing proceeds until you sign off on that quote, and it lists every opening, the pipe route, and the patching needed to close the walls again.
Will rerouting the line damage our tile or wood floors?
No. The new pipe travels through walls and the attic, so your floor covering never comes up and the concrete stays sealed. Most jobs need two small drywall openings, sometimes a third on an awkward route. We patch and texture those as part of the quoted price, not as an extra later.
Will we have running water while the reroute is happening?
For nearly all of it. We install and secure the new PEX before touching the old supply, so the taps keep working while we build the route. Water goes off only for the short tie-in at each end. We give you a heads-up first, so a shower or the dishes can be finished.
Does a slab reroute in Costa Mesa need a city permit?
Some do and some don’t. It depends on how much pipe we replace and what the work involves. We pull permits if necessary, and you’ll know before signing whether your job needs one. Any permit fee is shown on the written quote, so the cost doesn’t change after the work is done.
What should we clear out before the technician starts?
Make a path to the water heater, the main shutoff and any attic hatch. Empty the space under the kitchen and bathroom sinks so we can reach the valves. If pets are home, keep them in a closed room. Beyond that, carry on as normal: the testing itself is quiet and tidy.
What does the insurance adjuster need from us after a slab leak?
Mostly what we hand over. That’s a cause-of-loss write-up in the wording carriers expect, dated photos of the failed copper and any wet drywall or flooring, and an itemized scope. We send it all to the adjuster and reply to their questions. Any dry-out and rebuild is a separate scope, recorded in the same file.
How do we know you're licensed for slab work?
Cali’s Choice holds California contractor license CSLB #920054, and you can check it on the state licensing board’s website in a minute. We’ve located and repaired slab leaks since 2008. Your technician can show the license on arrival, so you never have to take our word for it.
After you reroute one line, can a slab leak come back?
Not on the line we replaced. That copper is capped off and carries no water, so it can’t leak again. Other buried runs in the same slab are as old as the one that failed, though, and they can wear out later. If a second run goes, we’ll talk about moving the whole house onto PEX.
The carpet in one room smells musty and feels cool and damp. Could that be the slab?
It can be. A slow leak under concrete can wick moisture up into carpet pad long before a puddle forms. A cold-line leak won’t feel warm at all. We run the meter test, split hot from cold, and listen along the pipe to confirm whether the slab is the source before anything is lifted.
Slab leak in Costa Mesa? We're 60 minutes away.
A real technician in a stocked truck, and a written quote setting out spot repair against reroute before anything is opened. If the job is not ours, we will tell you whose it is.
3943 Irvine Blvd, Ste 419 · Irvine, CA 92602 · CSLB #920054