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LEAK GUIDE · SANTA ANA & CENTRAL ORANGE COUNTY

What Happens on a Leak Detection Visit

Nobody enjoys booking a trade without knowing what they are agreeing to. This is the whole visit, start to finish: what we do, in what order, what it costs, what you get at the end, and the outcomes where the answer is that your plumbing is fine.

What Happens on a Leak Detection Visit

The Visit, in Order

1
We listen first
What you have noticed, when it started, whether it is worse at particular times, and what anybody has already done about it. This is not small talk, the pattern genuinely shortens the search.
2
The meter test
Everything isolated, and the meter watched. It establishes whether the pressurised supply is losing water at all, which either confirms the problem or eliminates half the possibilities in five minutes.
3
Isolate system by system
Irrigation from house, hot from cold, upstairs from down, supply from drains. A house is not one system, and narrowing beats searching.
4
Non-invasive detection
Acoustic listening, thermal imaging and tracer gas, in whatever combination the situation calls for. Nothing gets opened at this stage. Nothing.
5
Mark the leak
At the exact spot on the floor or wall, so you can see what we found rather than take our word for it.
6
Explain it and quote it
In plain language, with the options that genuinely apply, priced in writing, before anything gets opened.
Worth knowing Notice that nothing is cut, drilled or opened at any point in that sequence. Opening a building is a repair step, never a search step. If anybody proposes cutting to find a leak, that is worth questioning.

How Long It Takes

SituationTypical
Straightforward slab leak, clear symptomsAbout an hour
Whole-house search, no obvious starting pointOne to two hours
Mystery leak, somebody has already lookedTwo hours or more, by design
Pool leak with pressure testingTwo to three hours
Shower pan flood testHalf a day, the waiting is the test
Sewer camera inspectionUsually under an hour

The flat fee is what makes the longer ones possible without the clock changing what gets done. An hourly rate would charge the most for exactly the searches that are hardest, which is the situation you are most likely in if you have called a specialist.

What the Equipment Does

Acoustic listening
Ground microphones and listening discs pick up the sound water makes escaping a pressurised line. It works through concrete, which is why it is first on a suspected slab leak, and why a quiet house genuinely helps.
Thermal imaging
An infrared camera reads temperature difference through floors and walls. A hot-water line leaking under a slab warms the concrete above it, and the camera sees the shape of that long before anything is visible.
Tracer gas
An inert gas is introduced into a drained line and detected where it surfaces. It finds what the other two cannot: too quiet, too deep, or a line that is not pressurised.
Moisture meters and cameras
Moisture mapping shows what is wet right now; a sewer camera shows the inside of a drain. Neither is a leak detector on its own, and both narrow things usefully.

What It Costs

Detection visit
$150 – $500
Flat, credited toward the repair
Spot repair
$1,500 – $3,500
Accessible, or under finished floor
Reroute
$2,000 – $4,500
Per line
Whole-house repipe
$6,000 – $15,000
PEX or copper

Detection is a flat $150 to $500, credited toward the repair if you go ahead, and there is no detection fee if we cannot locate the leak during your paid visit. After-hours pricing is given on the call, before anybody is dispatched.

Everything we price is on the pricing page.

Ready to find out? Flat fee, credited, no find no fee.
Book a detection visit

What You Get at the End

The leak marked
At the exact spot, so you can see it rather than be told about it.
A written report
What was found, where, and by which method, the document a claim or a second opinion rests on.
Photographs
Yours to keep, taken before anything is opened.
An itemised written quote
With the exclusions named, before any work starts.

All four, whether or not you go ahead with the repair, and whether or not the answer turns out to be plumbing.

How to Make the Visit Shorter

  • Run the meter test beforehand and have the result. You will have done our first step for us
  • Try not to run water for about an hour before we arrive. Acoustic listening needs a quiet, settled system
  • Know where your main shut-off is, and clear access to it
  • Clear access to the suspected area, move stored items, and open side gates
  • Have the last twelve months of water bills to hand. They often say when this started
  • Write down the pattern: when it is worse, what else was running
  • If somebody has already been out, have their report. We read it afterwards, not first

None of that is required. All of it helps, and the quiet-system point in particular is the difference between a clean acoustic read and an ambiguous one.

Which Method Gets Used Where

People ask why a technician reached for one tool and not another. The choice is not preference, each method has a specific blind spot, and the situation decides.

Where the leak isFirst toolWhy
Under a slab, hot-water lineThermalThe concrete above a hot line warms measurably
Under a slab, cold-water lineAcousticNo thermal contrast to read
Inside a wallThermal and moistureBoth work through drywall without opening it
Under the yardAcousticSound carries through soil once the run is traced
Very deep, or very quietTracer gasFinds what acoustic cannot hear
A drain or sewerCameraNot pressurised, nothing for acoustic to hear
A poolPressure testingIsolates plumbing from shell before anything else

Reading that table sideways explains why a single-method company misses things. An acoustic-only search will struggle with a cold-water pinhole under a quiet slab, and a thermal-only search will miss it too. Together, they usually do not.

What We Will Not Do During the Visit

Not thisInstead
Cut into a wall or floor to lookLocate non-invasively, then open once, precisely
Quote a repair before finding the leakLocate first, price second, in writing
Recommend a repipe by defaultSay which of repair, reroute or repipe fits, and why
Take the failed part awayLeave it with you. It is claim evidence
Give you a price verbally and startWritten quote, agreed, before anything begins
Pressure you to decide todayThe report and quote are yours to sit on

The last row matters more than it sounds. A written quote you can take away and compare is the normal standard, and urgency applied to a decision rather than to the leak itself is worth noticing.

What This Site Is About, and What Belongs to Another Trade

We are licensed and insured plumbers, and this site is about leaks — finding the ones you cannot see and repairing them properly. Roughly half of what looks like a plumbing leak turns out not to be one, so the boundary is worth stating plainly.

Roof leaks are a roofer. Water under an air handler is an HVAC technician clearing a condensate drain. Water under an appliance is appliance repair. Drying, restoration and mold are separate trades again, and gas line repair is SoCalGas or a licensed gas fitter. We detect gas leaks, we do not repair gas lines.

The full list, with the trade to call for each, is on what we don’t do.

When the Answer Is Not a Leak

It happens on a meaningful share of visits, and it is a result rather than a failure.

The plumbing is sound
Meter still, systems tested, nothing losing water. You get that in writing with what was ruled out, and no detection fee.
It is a different trade
Roof, HVAC condensate, an appliance, drainage. Named specifically, as a hypothesis rather than a diagnosis, because we do not work on those systems.
It is condensation
Common, seasonal, and not a repair. See is it condensation or a leak.

A company paid the same either way has little reason to keep testing once a convenient explanation appears. No-find-no-fee is what makes the thoroughness credible rather than claimed.

Repairs on the Same Visit

Sometimes, and it depends entirely on what was found.

FindingSame day?
Accessible supply line, common materialsUsually yes
Fixture, valve or connectorUsually yes
Slab leak needing a rerouteNo — scheduled, one to two days
Buried main lineNo — needs locating, marking and often a permit
Sewer fault found on cameraNo — options priced first
Shower pan replacementNo — about a week, with tile
Whole-house repipeNo — scheduled properly

Where it is a same-day repair, you still get the written quote first. Where it is not, you get the schedule in writing alongside the price.

David Herrera, Founder & Lead Leak Detection Technician
About the Author
David Herrera, Founder & Lead Leak Detection Technician
David founded Leak Detection Santa Ana in 2026 after more than 15 years finding and repairing leaks across Orange County. He leads the crew that does the work, and the judgement calls on this page are the ones he uses in the field. Meet the team.

Get a Free On-Site Quote

Flat fee, credited toward the repair, and no detection fee if we cannot find it.

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What’s Included

  • Acoustic, thermal & tracer-gas location
  • Plain-language explanation of what we found
  • Firm written quote, on-site
  • No-find-no-fee guarantee

Frequently Asked Questions

About an hour for a straightforward slab leak with clear symptoms, one to two hours for a whole-house search, and longer for a mystery leak — by design. A shower pan flood test is half a day because the waiting is the test.

Not to find the leak. Acoustic listening, thermal imaging and tracer gas are all non-invasive, and that is deliberately the order they are used in. Anything gets opened only after the leak is located and you have agreed a written quote.

Somebody needs to let us in and point us at what you have noticed. That first conversation genuinely shortens the search. Anything beyond that is worth settling when you book.

A flat $150 to $500, credited toward the repair if you go ahead. Flat rather than hourly on purpose: the leaks that take longest to find are exactly the ones an hourly rate would punish you for.

No detection fee. You also still get the written record of every system that was tested and ruled out, which has real value. It is what the next trade starts from instead of starting over.

Often, for an accessible supply line, a fixture or a valve. A reroute, a buried main line, a sewer repair or a shower pan is scheduled work, and you get the schedule in writing alongside the price.

Run the meter test, avoid running water for about an hour beforehand, know where your main shut-off is, and clear access to the suspected area. Having the last year of water bills to hand helps too. They often say when this started.

Always, in writing, itemised, with the exclusions named. A verbal number followed by work starting is not how this should go, and a quote you can take away and compare is the normal standard.

You get it in writing: what was tested, what was ruled out, what we think it is, and which trade to call. And no detection fee, because there was no leak to locate.

Calls are answered 24/7 and a technician is dispatched 24/7, in English and Spanish. We do not publish a response-time window because we have not established an honest one. You get a real estimate on the phone.