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Infrared vs. Ultrasonic Leak Detection: How Murrieta Techs Find Hidden Leaks

By the Murrieta Leak Pros team ·

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When a leak hides under a slab or behind a wall, the right tool decides how fast it is found and how much floor or drywall gets opened. Two of the most used tools are infrared thermal imaging and ultrasonic or acoustic listening. This guide explains how each one works, which leaks each finds best, and why most Murrieta visits use both. Call (951) 299-3473 24/7 to talk it through.

Our leak detection Murrieta CA team carries both tools on every visit, along with pressure test gear and tracer gas.

What is infrared leak detection?

Infrared leak detection uses a thermal imaging camera to show small temperature differences on walls, floors and ceilings. Water that leaks from a pipe changes the surface temperature. A hot water leak shows up as a warm streak or bloom, and a cold water leak or wet drywall often shows up cooler as it evaporates. The camera does not see through walls; it reads the surface.

Infrared works best for hot water slab leaks, radiant heat lines, wet drywall behind showers, roof and window leaks, and tracing the path of a pipe under tile. It is fast, touch-free and leaves no marks.

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Technician scanning a Murrieta living room wall with an infrared thermal camera that shows a cool leak streak
Technician scanning a Murrieta living room wall with an infrared thermal camera that shows a cool leak streak

What is ultrasonic or acoustic leak detection?

Ultrasonic and acoustic leak detection listens for the sound water makes as it escapes a pressurized pipe. A tech places a ground microphone or contact sensor on the floor, wall or soil and moves it along the pipe route. The sound gets louder close to the leak. Filters remove household noise, so the tech can pinpoint a leak to within a foot or two.

Acoustic listening works best on pressurized supply lines: cold water slab leaks, main water lines in the yard, and copper lines inside walls. It can also confirm a leak the thermal camera only hints at.

Which method is better for my leak?

Neither is better on its own. Infrared is the faster first scan for hot water and wet surfaces, while acoustic listening pinpoints pressurized leaks, especially cold water lines that show no heat. Most Murrieta slab leak visits start with a pressure test to confirm which line leaks, then use thermal and acoustic tools together to mark the exact spot.

Leak typeInfraredAcoustic / ultrasonic
Hot water slab leakVery goodVery good
Cold water slab leakLimitedVery good
Wet wall or ceilingVery goodGood
Yard main water lineLimitedVery good
Drain or sewer leak (not pressurized)LimitedLimited (camera is better)

For the full step-by-step process, read leak locating methods, from the meter test to the final mark on the floor.

Have a leak? Don’t wait for it to get worse.

Our technicians are standing by 24/7 with the equipment to find your leak fast. No unnecessary digging, no guesswork.

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Why do Murrieta homes often need both tools?

Many homes in Murrieta Hot Springs, Bear Creek and Copper Canyon sit on concrete slabs with copper or PEX lines running under tile. Hot afternoons can warm slab floors near sunny windows, which hides a hot water leak from a camera. Busy roads and pool pumps add background noise for acoustic tools. Using both, plus a pressure test, gives the most accurate mark.

That accuracy matters. A precise mark means a small opening instead of a long trench. Our slab leak detection Murrieta CA service is built around that goal.

What does each visit cost in Murrieta?

You do not pay per tool. The visit price covers every method the tech needs. In Murrieta, a standard water leak detection visit usually costs about $200 to $550, and a slab leak visit about $250 to $650. You get the price before anyone is sent, and a written report with photos after.

What happens after the leak is marked?

The tech shows you the mark and the thermal or acoustic readings, then explains repair options. A slab leak can be spot repaired, rerouted, or fixed with trenchless methods. Repairs start around $300 and are priced before any work begins.

Compare options in our leaking pipe repair guide, or have our slab leak repair Murrieta crew quote it. Gas lines use different tools; for a gas smell, see our gas leak Murrieta CA page and leave the home first.

Frequently asked questions

Can a thermal camera see a leak through a wall?

No. It reads surface temperature. Water from a leak changes that temperature, which shows the likely spot, and other tools confirm it.

Is ultrasonic leak detection accurate?

Yes, on pressurized lines. A trained tech can usually pinpoint a leak to within a foot or two with ground microphones.

Does infrared work on cold water leaks?

Sometimes. Wet drywall often shows cooler as it evaporates, but a cold water slab leak may show little heat. Acoustic listening is better there.

How much does leak detection cost in Murrieta?

About $200 to $550 for a water leak and $250 to $650 for a slab leak, with every method included in the visit price.

Prices are approximate estimates for planning. Your final price depends on your property and is confirmed before work begins.

Where can I get help with this in Murrieta?

Murrieta Leak Pros offers Water Leak Detection, Slab Leak Detection. We serve every Murrieta neighborhood:

We also serve Temecula, Menifee, Wildomar, Lake Elsinore, Winchester, French Valley, Canyon Lake, Hemet and Sun City. See all service areas →

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