Leak Detection & Smart Shutoffs · Los Angeles & SoCal
Find the hidden leak — without tearing up your home.
Find hidden leaks and install automatic leak-detection devices.
A water bill that jumps, the sound of running water when everything is off, or a warm spot on the floor can all point to a hidden or slab leak. We locate it without opening walls or floors to go looking.
Then we help you stop the next one: smart shutoff valves watch your water use and close the main automatically if they detect a leak — even when you're away.
Signs you need this
- Unexplained jump in your water bill
- Water meter moves with everything off
- Warm or damp spots on floors
- Stains, mold or musty smells on walls
What's included
- Non-invasive leak location
- Slab leak detection
- Smart shutoff valve installation
- Clear repair options once the leak is found
Why Leon Plumbing
- Pinpoint first, open up only where needed
- Protection while you're away
- Licensed since 1983
Leak Detection & Smart Shutoffs: common questions
What is a slab leak?
A slab leak is a leak in a water-supply pipe beneath a concrete foundation. Signs can include an unexplained water-bill increase, a moving meter with fixtures off, damp flooring, warm spots or the sound of running water. Those symptoms can have other causes, so detection comes before opening the floor. Once the leak is located, repair options depend on pipe condition and access and may include a targeted repair or rerouting. For active flooding, safely shut off the water if possible and keep clear of wet electrical equipment.
How does a smart shutoff work?
A smart shutoff is installed on the main water line and monitors water use for patterns that may indicate a leak. Depending on the model, it can close the valve automatically and send phone alerts; some systems also work with separate moisture sensors. Detection settings, connectivity and power requirements vary, so no device guarantees it will catch every leak. Installation includes reviewing normal household use and accessible shutoff operation. We help you choose a system that fits your plumbing and explain its alerts, limitations and manual controls.
Leak Detection & Smart Shutoffs near you
Google reviews
What Leon Plumbing customers say
Leon Plumbing on Google
4.9 out of 5 · 129 reviews
“Leon Plumbing’s team were great to work with! I had a minor leak coming from my kitchen sink and the team came out immediately and fixed the problem. Communication was easy and straightforward. Thank you to our tech Mario and Datevig and Sevan for a smooth experience!”
Erika Liu Wong
via Google“I needed a service for a Rinnai tankless water heater for a tenant in Eagle Rock. I called Leon plumbing and was surprised that they could have a tech out in about an hour. The tech did a complete service for $275, which seemed somewhat reasonable, and a needed valve replacement for another $275, which (though steep) was at least done quickly. I would recommend them for speed, good communications, and quality of the work.”
Steve Wolf
via Google“Excellent service! Sevag was super helpful and the team came out very quickly, fixed our water heater and made the whole process easy. We are extremely happy with their outstanding work and we highly recommend them!”
Despina Spanidou
via Google“As always, excellent service. This is my go-to plumber. Reliable, responsive, efficient.”
Steven Graubard
via Google“Very good service and anytime I call ready for the service god bless them 🙏”
Kevork Ashjian
via Google“⭐⭐⭐⭐⭐ Sevag is excellent! He is professional, reliable, and knowledgeable, and takes pride in doing quality work. He explains everything clearly, is dependable, and makes sure the job is done right. It’s hard to find someone you can trust, and Sevag definitely delivers! I highly recommend him to anyone looking for outstanding plumbing services.”
Joseph Khankhanian
via GoogleLatest written reviews from our main Leon Plumbing listing · Updated Oct 30, 2026
Leaks & Repiping in our core communities
Leon Plumbing Advantage
Pay less for every plumbing visit — for $34.99/mo.
- Free $149 whole-home inspection
- $99 dispatch fee waived*
- 10% off all repairs & labor
- Same / next-day priority
- 2-year workmanship warranty
- 50% off after-hours premium