Leak Detection & Repair Plumbers of a Higher Quality

Leak Detection & Repair in San Jose

Licensed Plumbers Serving the Bay Area Since 1983

Hidden leaks don’t announce themselves. By the time a soggy patch appears or a water bill spikes, damage has usually been building for weeks. CMS Plumbing is a licensed and insured plumbing company with over 40 years of experience, and we bring dedicated detection equipment to every leak call in San Jose so we know exactly what we’re fixing before we touch a pipe.

Call us any time at (408) 669-4222 for a free estimate on leak detection and repair. We offer emergency after-hours service for situations that can’t wait.

How We Approach Every Leak Job

Our process starts with diagnosis, not assumptions. We use advanced leak detection tools and proven inspection techniques to pinpoint the exact source before recommending any repair. Once we’ve located the problem, we walk you through your repair options in plain language and review any San Jose permitting requirements that apply.

You receive a detailed, upfront estimate before work begins. No hidden charges, no surprises on the invoice. When a repair involves public utilities or city infrastructure, we handle the City of San Jose permit approvals on your behalf, so you don’t have to navigate that process alone. When the job is done, our work is backed by a labor warranty.

For leaks that require excavation, our PG&E Certified Dig Safely OQ Card certification means underground access is handled to utility-safety standards, protecting your property and the lines beneath it.

Signs Your San Jose Home May Have a Hidden Leak

Some leaks are obvious. Many aren’t. Watch for these warning signs:

Unexplained water bill increases when usage habits haven’t changed
Low water pressure at fixtures throughout the house
Damp, soggy, or discolored spots on walls, ceilings, or in the yard
Musty odors suggesting moisture behind a surface
The sound of running water when no fixtures are in use
Warm spots on flooring, which can point to a slab leak in a hot water line running beneath the concrete foundation

San Jose properties face a particular combination of risk factors: shifting clay soil, aging pipe systems, and mature urban tree canopies. Older neighborhoods like Willow Glen, Rose Garden, and Almaden Valley often have original piping that’s more susceptible to corrosion and breakage. Root intrusion into water lines is common in these areas, and the city’s complex infrastructure means reduced water pressure or sudden bill spikes can have several possible sources. We know these neighborhoods and the patterns we typically find there.

Start with a Free Estimate

Calling us doesn’t commit you to anything. We provide a free, detailed estimate after diagnosis so you can make an informed decision. If you’re seeing any of the warning signs above, or if something just doesn’t feel right about your water system, reach out before the problem grows. We’re available for emergency after-hours calls and serve homeowners throughout San Jose and the surrounding Bay Area.

Call CMS Plumbing at (408) 669-4222 or use our contact form to schedule leak detection and repair service today.

Types of Leaks Found in San Jose Homes

Knowing where leaks tend to develop can help you recognize symptoms earlier. Most residential leaks fall into three broad categories, each with its own causes and typical signs.

Slab Leaks

Slab leaks occur in water lines running beneath a home’s concrete foundation. Because the pipe is enclosed in concrete, the leak rarely surfaces right away. Warm spots on flooring, unexplained indoor humidity, or the sound of water running underfoot are common indicators. Left unaddressed, slab leaks can affect the foundation.

Underground Water Line Leaks

Water lines running from the street to your home pass through soil, near tree roots, and across aging joints. Shifting ground, root intrusion, and pipe corrosion all create vulnerabilities. A persistently wet patch in the yard, dropping pressure at every fixture, or a meter that runs when all valves are closed can point to an underground water line leak.

Fixture & Appliance Leaks

Leaks at water heaters, toilets, washing machine connections, and supply valves are usually more visible, but they waste water quickly if ignored. In older San Jose homes, supply line fittings and shutoff valves that haven’t been replaced can fail with little warning.

Non-Invasive Leak Detection Technology

Modern detection methods can locate a hidden leak without opening walls or pulling up flooring unnecessarily. Here’s how the main approaches work:

Acoustic Leak Detection
Acoustic equipment amplifies the sound of water escaping under pressure. By moving a sensitive listening device along a pipe’s path, a trained plumber can narrow down the leak’s location to a small section, minimizing the area that needs to be accessed.

Thermal Imaging
Thermal imaging cameras detect temperature differences caused by hidden moisture. A wet area behind a wall or beneath a floor registers differently than dry material, making it possible to identify leak zones without demolition.

Electronic and Pressure-Based Detection
Electronic listening devices and pressure testing are particularly useful for underground or slab-enclosed pipes. By measuring pressure loss and using electronic amplification, we can locate leaks in lines that have no visible access point.

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Top-Rated plumbers

In the Bay Area

Free & Detailed Estimates Provided
We offer upfront quotes before we get to work.
Emergency After-Hour Service
When you need plumbing fast, don't hesitate to call!
Over 40 Years of Experience
We take pride in being experts at all things plumbing.
We Get the Job Done Right the First Time
Exceeding your expectations is our #1 goal.

We Let out customers do the talking

Hear Their Thoughts on CMS Plumbing!

"Best Service Ever!"
CMS Plumbing--Efficient and on-time service. Above all, Rommel is honest and only provides the services that are necessary. He goes above and beyond what his job calls for. Thank you CMS (and Rommel)!!!

- Ellen A
"They do an amazing job !!! Very satisfied!"
Sam, was the plumber who came and unclogged my sink ! He did a great job and he’s also bilingual! He did the work fast and clean ! Put tarp down so he wouldn’t mess up the carpet ! Amazing !!

- Axel C.
"Amazing positive experience"
I just had an amazing positive experience with one of the owners Jeremy Sutherland and two of his wonderful crew, Aurturo and Jose with CMS Plumbing. Please, send them any of your plumbing business. After a different plumber tried taking her to the cleaners and dragging the repair out three days. Jeremy got his guys over to the house. Aurturo took care of mom's emergency gas leak with an estimate and repaired it in under an hour with an amazingly reasonable price.

- A Schwafel
"They did an excellent job"
I usually don't write reviews, but felt compelled to express my gratitude and thanks to Cory and team for a job well done. I have an old building that required trouble shooting and strategy before fixing the issues. CMS Plumbing explained all the options available always with cost savings in mind to complete the project. They did an excellent job, I highly recommend them for any of your plumbing needs.

- Tom

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