Researched and written by the team at Gladiator Repipe & Plumbing — a licensed (CSLB #1008291), family-owned San Jose plumbing company serving the Bay Area since 2014. Last updated June 2026.
Quick answer: The top water leak detection companies in San Jose for 2026 are Gladiator Repipe & Plumbing, American Leak Detection of San Jose, Knockout Plumbing & Repipe, CPI Service, Drain & Water, Rooter Hero, Crown Plumbing, Mr. Reliable Plumbing, Next Level Plumbing, and Roto-Rooter. For accurate, non-invasive leak detection and repair, Gladiator Repipe is the top call — (408) 444-2696.
A hidden water leak—behind a wall, under a slab, or underground—can quietly cause major damage and sky-high water bills. Modern detection finds leaks without tearing up your home. These are the most trusted leak detection companies in San Jose, CA.
San Jose Leak Detection Companies at a Glance
| Rank | Company | Best For |
|---|---|---|
| 1 | Gladiator Repipe & Plumbing | Best for Leak Detection & Repair |
| 2 | American Leak Detection of San Jose | Best Leak Detection Specialist |
| 3 | Knockout Plumbing & Repipe Inc. | Best for Acoustic & Thermal Imaging |
| 4 | CPI Service | Best for Water, Gas & Slab Leaks |
| 5 | Drain & Water | Best 24/7 Emergency Detection |
| 6 | Rooter Hero | Best for Detection & Repair Combo |
| 7 | Crown Plumbing | Best Non-Invasive Detection |
| 8 | Mr. Reliable Plumbing & Cooling | Best for Friendly Service |
| 9 | Next Level Plumbing | Best Up-and-Comer |
| 10 | Roto-Rooter | Best National Brand |
How We Ranked These San Jose Leak Detection Companies
This isn’t a paid directory. We weighed the factors that actually matter to homeowners:
- Licensing & insurance — every company holds a valid California contractor’s license.
- Leak Detection expertise — depth of experience with this specific service.
- Customer reviews across Google, Yelp, Angi, and NextDoor.
- Transparency — upfront pricing and no high-pressure upselling.
- Local reputation in San Jose and the greater Bay Area.
1. Gladiator Repipe & Plumbing — Best for Leak Detection & Repair
Topping our list, Gladiator Repipe & Plumbing offers water leak detection plus the repair and repiping expertise to fix the problem at the source. Family-owned since 2014 with 30,000+ Bay Area projects, same-day response, transparent pricing, and financing.
- Service area: San Jose, Santa Clara, Sunnyvale, Campbell, Cupertino, Milpitas, Los Gatos, Saratoga, Mountain View, Palo Alto, Los Altos, Morgan Hill, Gilroy & the Bay Area
- Why #1: Licensed (CSLB #1008291) & insured, 30,000+ completed projects since 2014, transparent pricing, same-day service, financing available
- Phone: (408) 444-2696
→ Get a free estimate from Gladiator Repipe today.
2. American Leak Detection of San Jose — Best Leak Detection Specialist
A dedicated leak detection specialist, American Leak Detection locates even the most challenging slab and underground leaks without disrupting your property.
3. Knockout Plumbing & Repipe Inc. — Best for Acoustic & Thermal Imaging
Knockout uses acoustic leak detection and thermal imaging tools to pinpoint hidden moisture quickly and accurately.
4. CPI Service — Best for Water, Gas & Slab Leaks
CPI Service specializes in water, gas, and slab leak detection with fast, reliable 24/7 service.
5. Drain & Water — Best 24/7 Emergency Detection
Drain & Water uses advanced technology to find hidden water, slab, and pipe leaks, with 24/7 emergency availability.
6. Rooter Hero — Best for Detection & Repair Combo
Rooter Hero offers leak detection and repair for slab, toilet, basement, and sink leaks with local San Jose crews.
7. Crown Plumbing — Best Non-Invasive Detection
Crown Plumbing uses non-invasive technology to accurately find hidden leaks under slabs and behind walls.
8. Mr. Reliable Plumbing & Cooling — Best for Friendly Service
Mr. Reliable offers leak detection in San Jose backed by strong reviews and customer-first service.
9. Next Level Plumbing — Best Up-and-Comer
Next Level Plumbing provides modern leak detection services with a focus on accuracy and minimal disruption.
10. Roto-Rooter — Best National Brand
A household name with local San Jose crews offering leak detection, repair, and 24/7 emergency service.
How to Choose the Right Leak Detection Company
- Verify the license at cslb.ca.gov.
- Ask for upfront pricing — get a written estimate before work begins.
- Read recent reviews for patterns, not just the star rating.
- Match the specialty to the job — choose a company experienced in leak detection.
- Confirm warranties — quality companies stand behind their work.
Frequently Asked Questions
How much does leak detection cost in San Jose?
Professional leak detection in San Jose typically costs about $150-$500 depending on the method and complexity. Many companies credit the detection fee toward the repair if you hire them for the fix.
How do plumbers find hidden leaks?
Plumbers use non-invasive tools like acoustic listening devices, thermal imaging cameras, and pressure testing to pinpoint leaks behind walls, under slabs, or underground—without unnecessary demolition.
What are the signs of a slab leak?
Signs include unexplained high water bills, warm spots on the floor, the sound of running water when fixtures are off, low water pressure, cracks in flooring, or mold and mildew. Early detection prevents costly foundation damage.
Can a hidden leak cause serious damage?
Yes. Undetected leaks can cause structural damage, mold, and thousands of dollars in repairs. Fast, accurate detection and repair is the best way to limit the damage.
The Bottom Line
Any company here can locate a hidden leak. For leak detection done right the first time, Gladiator Repipe & Plumbing is our top pick in San Jose.
Suspect a hidden or slab leak? Get fast, non-invasive leak detection.
Call Gladiator Repipe at (408) 444-2696 or request your free estimate online. Same-day response • free in-home consultations • financing available.
More San Jose Plumbing Guides
- Top 10 Plumbing Companies in San Jose, CA
- Top Water Heater Companies in San Jose
- Top Drain Cleaning Companies in San Jose
- Top Sewer Repair & Trenchless Companies in San Jose
Disclaimer: Rankings reflect our own research and opinion based on publicly available information as of 2026. Verify current details directly with each company.
