Leak Detection Service
The worst leaks are the ones you can’t see: a supply line weeping under the slab, a fitting dripping inside a wall, a main line soaking the yard. Opening floors and walls to look for them is expensive. Oasis Plumbers finds leaks from the outside first – listening, measuring temperature and testing pressure – and marks the spot, so the repair opening is as small as it can be.
Pinpoint first, open second · Marked location and photos after every detection visit · Licensed plumbers
Signs of a hidden leak
- The water bill jumps without a change in use
- The meter’s leak indicator moves with every fixture off
- Warm spots on a tile or concrete floor
- Sound of running water when nothing is on
- Musty smell, swelling baseboards or new cracks in flooring
- A patch of lawn that stays green or soggy in dry weather
Want to check before calling? The meter test on our water leak repair page takes two minutes.
How we find leaks without tearing things open
| Method | How it works | Good for |
|---|---|---|
| Pressure test | Isolate sections of the system and watch for pressure loss | Confirming a leak exists and which line it’s on (hot, cold, yard) |
| Acoustic listening | Ground microphones amplify the hiss of water escaping a pipe | Leaks under slabs, driveways and lawns |
| Thermal imaging | A camera shows temperature differences on floors and walls | Hot-water leaks in slabs and walls |
| Moisture meter | Measures water in drywall, wood or flooring | Mapping how far water has spread |
| Line locator | Traces the route of a pipe from above | Knowing where the line runs before marking the spot |
| Drain camera | Films the inside of drain and sewer pipes | Leaks and breaks in drains, not pressurised lines |
What you get from a detection visit
- Confirmation of whether there is a leak, and on which line.
- The leak location marked on the floor, wall or ground.
- Photos or thermal images and a short written summary – useful for your insurer.
- Repair options and a written quote.
From finding the leak to fixing it
| Where the leak is | Next step |
|---|---|
| Supply pipe in a wall, ceiling, crawl space or yard | Water leak repair |
| Water line under the concrete slab | Slab leak repair – spot repair or reroute |
| Drywall, baseboards or ceiling damaged by the leak | Leak damage wall repair |
| Several leaks on old pipe | Repiping |
Leak detection FAQs
How do plumbers detect hidden water leaks?
By isolating lines and testing pressure, then listening for the leak with acoustic ground microphones and scanning floors and walls with thermal cameras and moisture meters. The spot is marked before anything is opened.
How accurate is professional leak detection?
With acoustic and thermal tools a leak is usually located to within a small area, so the repair opening stays small. Accuracy depends on depth, pipe material and background noise.
How long does leak detection take?
Most homes take one to three hours, depending on how many lines need testing and how deep the pipes run.
Will my insurance pay for leak detection?
Some policies cover the cost of finding a leak when the resulting damage is covered. The marked location, photos and written summary help with the claim.
Can you find a leak under a concrete slab without breaking it?
Yes. Acoustic listening and thermal imaging locate slab leaks from above; concrete is only opened at the marked spot if a direct repair is chosen.
What if no leak is found?
If the pressure test shows no loss, the cause of a high bill is usually a running toilet, irrigation or a meter issue, which we check before leaving.
Leak detection near you
Book a detection visit through the office nearest you:
Los Angeles County
- Sunland — 8348 Foothill Blvd, Sunland, CA 91040 · (805) 883-6154
- Santa Monica — 701 Pico Blvd #551, Santa Monica, CA 90405 · (310) 818-7582
- Calabasas — 24025 Park Sorrento #430, Calabasas, CA 91302 · (818) 330-1138
Orange County
- Laguna Hills — 25272 McIntyre St #558, Laguna Hills, CA 92653 · (949) 635-7337
- Anaheim — 800 S Brookhurst St, Anaheim, CA 92804 · (714) 706-3926
Find the leak before it finds your floor
Tell us what you’ve noticed – bill, sound, warm floor or stain. Call (888) 803-7895 or send the form to book a detection visit.