San Marcos Slab Leak Detection & Repair
San Marcos slab leak detection answers one question before any work starts: which buried line is losing water? This city grew in waves, from 1970s tracts in 92069 to newer streets in 92078, so we test the pipe you actually have. Free leak detection when you proceed with us for the repair, and a tech can reach you within 60 minutes.
- Tech on site within 60 min
- Attic PEX reroutes for failed copper
- Floors and tile stay put
- CSLB License #920054
Before you call: we handle the water lines in and under the house. Pool and spa leaks, irrigation lines and gas lines are outside our work. A leak in the slab, beneath the foundation, or inside a wall that feeds a fixture is ours.
A 1970s boomtown, with plumbing laid down in layers
San Marcos grew fast once the water came. Colorado River water reached the valley in 1956, the city incorporated in 1963, and in the 1970s it ranked as the third fastest-growing city in the state. In 92069, the north side, the 1970s is still the biggest building decade: 4,565 of its 15,711 homes date from it. Homes of that age often have copper water lines set inside the slab. A slab leak is a break in one of those buried lines, and in copper that old it often starts as a pinhole.
The south side is younger. In 92078 the typical home dates to 2000, and San Elijo Hills was approved as a planned community in 1997. Citywide, the median home was built in 1996. Vallecitos Water District supplies the city, and part of its water is desalinated seawater.
No Callout Charge
The service call costs nothing. No trip charge, and nothing added before we've looked at the problem.
Always On Call
Nights, weekends and holidays included. We shut the line down, cap the water and stop the damage first.
Written Estimates
The repair scope in writing, with the test results behind it. You see the price before any drywall is cut.
Three kinds of leak calls we take in San Marcos
Most San Marcos calls land in one of these three. In all of them, testing comes before any opening, and your concrete stays intact.
Slab Leak Detection & Repair
San Marcos slab leak repair starts with water escaping from a line sealed in the concrete. We work out which line broke. Then new PEX (a flexible plastic water line) takes over its job, routed overhead, so nobody breaks up the slab.
- Hot or cold line pinned down
- Sound picked up on the pipe
- Overhead bypass, slab untouched
Hidden Water Leak Detection
Hidden leak detection in San Marcos covers the leaks you can't see: a soft patch of drywall, a ceiling stain, a cabinet floor that stays damp. We follow the clue back to the pipe and repair it, most often through one small opening.
- Wallboard, ceilings, vanities
- Gauge test to prove the loss
- Usually a single small cut-in
Emergency Leak Response
A fitting has burst and water is spreading. We stop the flow and protect the rooms first, then trace the cause.
- Crew there inside 60 minutes
- Supply shut, spread contained
- Cause traced once it's safe
What happens when we test a San Marcos home for a slab leak?
We don't guess, and we don't bring a jackhammer. The same four checks happen on every call, and the floor stays closed until we can name the failed line.
Watch the meter
First, every faucet and appliance goes off. A meter that still turns means water is escaping. Next we close the house shutoff valve. If the meter stops, the leak is inside the home. If it keeps turning, the trouble is in the pipe between the meter and the house.
Find the leaking side
We close the cold supply feeding the water heater. When the leak signal fades, a hot line is at fault. When it stays steady, the cold side is. A warm patch on the floor points toward hot water, but we test before we say so.
Listen on the pipe, then pressure test
Our acoustic gear goes on the pipe at valves, the water heater and any exposed run. We don't listen through the slab, because concrete dulls the sound. A gauge on an outdoor faucet confirms the loss by itself. Thermal imaging only backs up what the other tests show.
Repair it, in writing first
A failed line inside the slab stays where it is, and new PEX goes in overhead through the attic. A leak at a valve, the water heater or inside a wall usually gets a spot repair instead. You see the plan and price on paper before we start.
Our thanks to the people who keep San Marcos running.
A 5% discount (up to $200 off) for first responders, military, healthcare, teachers, seniors, and nonprofit staff serving San Marcos 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
Applies to repairs over $500. Cannot be combined with other promotions. Proof of eligibility may be requested at the time of service.
Where in San Marcos we track down slab leaks.
State Route 78 serves San Marcos with six interchanges. Our techs work along San Marcos Boulevard, Twin Oaks Valley Road, Mission Road, Grand Avenue and Barham Drive, and the streets off them. From Richland to San Elijo Hills, every address is inside our 60-minute window.
Our Office
San Diego, CA 92127
San Marcos neighborhoods we cover for leak work
A sample of the areas we cover. If your street isn't on the list, we still come out. Just call.
Leak work is what we do, and we've done it since 2008.
Cali's Choice
Slab leak and hidden leak specialists.
Slab leaks located and repaired
Overhead reroutes and spot repairs, combined.
California License
C-36 Plumbing classification. Bonded & insured statewide.
Leak detection
Free when we do the repair.
Homeowners on our leak repairs.
Verified Google reviews from Cali's Choice leak jobs.
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!
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. They made a stressful situation much better and seemed liked they really cared. He even came out on his day off to finish the work. In addition, their price was reasonable. Everything is working great now. They will be my go to for any future plumbing needs. I highly recommend them.
A new leak was detected at my bathroom 2 about 2 weeks ago, then I have called Ginny at Cali choice plumbing and restoration for help and she has responded back immediately with an appointment set in the next day. The technician was very helpful and provide the reasonable quote promptly with well explanation about the leak area and solution. We were very glad about their services and craftsmanship. The leak was isolated and well fixed…… we are very happy about their professional services.
Slab leak going on your homeowner's policy? Here is the proof we give your carrier.
Carriers pay on evidence. Our techs record it on the job and pass it along, and we stay in touch with the claims side until it closes.
- Which pipe gave out, what it is made of, and what caused the failure, written up plainly.
- We take dated pictures of each reading, every opening and the broken pipe.
- Itemized costs for the fix, plus our reasons whenever rerouting beats patching.
- Calls and emails with your adjuster handled by us, extra questions included.
- Soaked carpet, tile or wallboard needs drying and rebuilding. That is a separate restoration scope and stays off our plumbing invoice, but we still record it for the claim.
How much does slab leak repair cost in San Marcos?
Every slab job is priced after testing, since the fix follows the findings. Four things drive the total, and knowing them makes the written quote easy to read.
The four cost drivers
Number of failed runs
A single reroute is the simplest job. If several runs are failing at once, a larger reroute or whole-house repipe can make more sense.
Pipe age
When 1970s copper fails in one spot, the rest of that run is often worn too, and our advice may change.
Attic room and house height
Single-story homes with roomy attics are quicker work. A second floor or a tight attic means more hours.
Existing water damage
Drying and rebuilding soaked materials is a separate scope from the plumbing. We record it for your insurer.
Does your 60-minute window reach the homes around Double Peak Park in San Elijo Hills?
Yes. Every San Marcos address is inside our 60-minute window, and that includes San Elijo Hills and the streets near Double Peak Park, which opened in 2009. Call our dispatch at any hour. A technician checks the meter first, then tests the lines, and you get a written quote before anything is opened.
San Marcos gets cool, overcast mornings in May and June. Can a sweating cold-water pipe look like a hidden leak?
It can. Moist air condenses on cold supply lines and fittings, and the drip can stain drywall or dampen a cabinet floor. The difference is the meter: sweat doesn’t move it, a leak does. Before anyone opens a wall, we test the line under pressure, so you don’t pay to chase condensation.
Our San Marcos home is in the hills, where the soil may hold expansive clay. Why shouldn't a slab leak wait?
The city’s draft safety plan says clay in the hillside rock layer known as the Santiago Formation swells when wet and shrinks as it dries. A slab leak keeps putting water into the ground under your home. On clay, that is a reason to find the line soon rather than wait. We test first and open nothing until we know.
We live near the San Marcos Creek or Twin Oaks Valley creek valleys. What does collapsible soil mean for our pipes?
The city’s draft safety plan names those creek valleys as the most likely places for collapsible soil (soil that settles suddenly when it gets wet), which can damage foundations and walls. A moving or cracked slab can strain the lines inside it. New floor cracks plus a meter that moves with everything off are worth a test.
Our house in 92069 went up in the 1970s. Is that common on the north side?
Very. In 92069 the 1970s is still the biggest building decade: 4,565 of its 15,711 homes date from it. Homes of that age often have copper water lines set inside the slab, and in copper that old a leak often starts as a pinhole. We test first, then show you what we find.
Meter spinning with every faucet off in your San Marcos home? A technician can be there within 60 minutes.
A local technician finds the leak first and gives you a written quote before anything is opened. If it isn't our kind of job, we'll say so.
11440 W Bernardo Ct, Ste 300C · San Diego, CA 92127 · CSLB #920054