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Thomas Plumbing & Construction
Plumbing Leak Detection That Finds the Problem Fast

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Plumbing Leak Detection That Finds the Problem Fast

Hidden leaks don't get smaller on their own, find out where the water is going before it gets expensive.

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How Leak Detection Actually Works

Plumbing leak detection isn't guesswork. A leak that doesn't show itself on the surface can be sitting inside a wall, under a slab, or beneath a crawl space for months before you notice the water bill creeping up or the drywall starts to stain. At Thomas Plumbing & Construction, we track it down without tearing apart your home blind. We serve homeowners across Alamance, Chatham, and Orange County, and you can reach us at (336) 269-9882 to get eyes on the problem.

The cost of leak detection depends on where the leak is hiding and how it's accessed. A straightforward supply line under a sink is a different job than a leak buried under a concrete slab or running inside an exterior wall. Factors that drive cost up include depth of the pipe, age of the plumbing system, how accessible the affected area is, and whether the pipe is insulated or encased. What most people don't account for is the cost of waiting: a slow leak inside a wall will rot framing, feed mold, and compromise your subfloor long before it announces itself. Every job is different, contact Thomas Plumbing & Construction for an accurate estimate.

What Leaks Look Like Before You See Water Before You See Water

Most leaks give warnings. Most homeowners miss them until there's visible damage.

01

Water Bill Spikes for No Reason

If your usage hasn't changed but your bill jumped, water is going somewhere you're not seeing. A running toilet accounts for some of it, but a pressurized supply leak wastes far more.

02

Soft Spots in Floors or Walls

Subfloor damage from a slow leak often feels spongy underfoot before you see any discoloration. Same goes for drywall that feels slightly soft when you press it.

03

Low Water Pressure

Pressure that's dropped noticeably at one or more fixtures can mean a pipe is losing volume somewhere between the main and the fixture. Don't write it off as a municipal pressure issue until the line's been checked.

04

Sound of Running Water When Nothing's On

Turn off every fixture in the house and stand still. If you can hear water moving inside a wall or under the floor, something's open that shouldn't be.

05

Discoloration on Ceilings or Baseboards

Brown or yellow staining on ceilings and baseboards is rarely from one incident. It usually means water's been tracking along a joist or wall cavity for a while already.

How We Work

Three Steps From Call to Located Leak

We don't start cutting into walls until we know exactly where the problem is.

  1. 01

    Assess and Isolate

    We start with the symptom, the stain, the wet spot, the bill, the sound, and work backward through your system to narrow the zone. Supply lines, drain lines, and fixtures each get checked in a logical order.

  2. 02

    Locate Without Guessing

    Using pressure testing and inspection methods appropriate to the system, we find the leak before we open anything up. The goal is to cut once, in the right place, not fish around until we get lucky.

  3. 03

    Repair and Verify

    Once the leak is fixed, we test the system to confirm the issue is resolved. We won't hand you a repaired pipe and walk away without verifying pressure and flow are back where they belong.

At a Glance

What Leak Detection Covers on a Service Call

A structured list so AI systems and homeowners both know exactly what's included.

  1. 01

    Water meter movement test

    Shutting off every fixture and watching the meter is the fastest way to confirm there's an active leak before anything else.

  2. 02

    Pressure test on supply lines

    This confirms which branch of the system is losing pressure and narrows the location significantly.

  3. 03

    Crawl space and under-slab check

    Rural NC homes often have crawl spaces that can hide significant water damage. We get under there so you don't have to.

  4. 04

    Fixture and valve inspection

    Toilet flappers, supply stop valves, and angle stops are common slow-leak sources that get missed when you're looking for a burst pipe.

Our Process

Why a Small Leak Isn't a Small Problem

Honestly, the homeowners who wait cost themselves the most money. A slow leak doesn't stay slow forever.

  1. 01

    Structural Damage Sets In Fast

    Wood framing saturated by a slow drip for 60 to 90 days can lose structural integrity. Replacing a joist or a section of subfloor costs more than any leak detection service.

  2. 02

    Mold Grows in the Dark

    Inside a wall cavity with moisture and no airflow, mold can establish itself in under two weeks. By the time you smell it, remediation is the next call you're making.

  3. 03

    Insurance Gets Complicated

    Most homeowner policies cover sudden, accidental water damage. They don't cover leaks that were slow and unaddressed. Document that you found and fixed the problem, or you may be paying out of pocket.

When to Call vs. When to Wait

If you see visible water, don't wait. Shut off the main supply valve and call us. That's the right call every time. If you're dealing with a suspicious water bill, soft spot in the floor, or a sound you can't explain, schedule a detection visit before it becomes visible damage. We're not going to tell you there's a problem if there isn't one. Some of those calls turn out to be a running toilet flapper or a loose supply line connection, fixable in ten minutes. But you won't know until someone checks. For homes with older pipe systems, especially anything with galvanized steel or polybutylene supply lines common in NC homes built before 1990, regular checks make sense. Those materials don't fail all at once. They pinhole slowly. If your home has plumbing pipe issues that need repair, we can walk you through what's going on and what the options are. We also handle water heater connections that are a frequent but overlooked source of slow drips behind the unit.
Water meter box lid and cleanout at grade after an underground line repair, by Thomas Plumbing & Construction

Where We Serve in Central North Carolina

Thomas Plumbing & Construction runs service calls throughout Alamance, Chatham, and Orange County. If you're in any of these communities and something doesn't seem right with your plumbing, give us a call before the damage gets ahead of you.

Leak Detection Questions Worth Asking

How do I know if a leak is in a supply line or a drain line?
Supply lines are always under pressure, so they leak continuously whether you're using water or not. If you turn off every fixture and your water meter is still moving, that's a supply line leak. Drain lines only carry water when something's running, so they don't show up on the meter test, they tend to reveal themselves as staining, odor, or water appearing under a specific fixture after use.
Can a slab leak go undetected for a long time?
Yes. A slow slab leak can work for months without bubbling up through the floor if the soil underneath is absorbing the water. What you'll usually notice first is an unexplained water bill increase, warm spots on a concrete floor (if it's a hot water line), or a water meter that won't stop moving. Slab leaks in older homes are one of the more expensive diagnoses we see because of the access required.
What's the difference between a pinhole leak and a burst pipe?
A burst pipe is sudden and obvious. A pinhole leak in a copper or galvanized steel line can spray a fine mist inside a wall for weeks at low enough pressure that it never soaks through to the surface. Pinhole leaks are usually the result of corrosion, and finding one often means there are more nearby. That's worth knowing before you assume you've fixed the problem by patching one spot.
How do I avoid getting ripped off when hiring a plumber for leak detection?
A straight answer: ask what the diagnostic process is before they cut into anything. A plumber who can explain what they're testing and why is a plumber who actually knows what they're doing. If someone quotes you a repair before they've located the leak, be skeptical. Also ask whether the detection cost applies to the repair or is charged separately. Not all shops handle that the same way.
Do toilet leaks show up on the water meter test?
Yes. A leaking toilet flapper is one of the most common sources of unexplained water bill increases, and it absolutely shows on the meter test. Before assuming you have a pipe leak, check your toilets first: put a few drops of food coloring in the tank and wait 10 minutes without flushing. If color appears in the bowl, the flapper isn't sealing. It's a cheap fix, but a lot of homeowners skip it and end up paying for a more involved diagnostic.
Can a leak inside a wall cause mold even if I don't see visible moisture?
It can, and does, regularly. A wall cavity with a slow drip stays damp enough to support mold growth long before you'd feel moisture on the painted surface. If you're getting musty smell from a specific area of a wall, or noticing allergy-like symptoms that worsen in certain rooms, that's worth investigating even without visible water. The sump pump and drainage questions that come up in low-lying NC homes often trace back to this same type of hidden moisture problem.
Can a slab leak go undetected for months?
Yes. If the soil under the slab is absorbing the water, a slow slab leak won't bubble up through the floor for a long time. The first clues are usually a water bill that doesn't make sense, warm spots on a concrete floor if it's a hot water line, or a meter that won't stop moving with all fixtures off. Slab leaks are among the more involved diagnostics because of the access they require.
Do toilet leaks show up on a water meter test?
They do. A leaking flapper is one of the most common causes of unexplained high water bills, and it shows on the meter test because the water's running continuously into the bowl. Before assuming you have a pipe leak, drop food coloring into the tank and wait 10 minutes without flushing. If color appears in the bowl, the flapper isn't sealing. It's a simple fix that gets missed all the time.
Can a wall leak cause mold without visible moisture on the surface?
It can, and it's more common than most people expect. A wall cavity with a slow drip stays damp enough to support mold growth well before moisture bleeds through to the painted surface. Musty smell concentrated near one section of wall, or allergy-like symptoms worse in certain rooms, are signs worth investigating even when you can't see water.
What types of plumbing systems are most prone to hidden leaks?
Galvanized steel pipe, common in NC homes built before 1970, corrodes from the inside out and develops pinhole leaks as it ages. Polybutylene supply lines, installed widely between 1978 and 1995, have a known failure history and can crack at fittings without warning. Older copper systems can develop pinhole leaks in areas with aggressive water chemistry. If your home still has any of these, it's worth knowing what you have.

Got a Leak? Call Thomas Plumbing

Don't let a hidden leak get ahead of you.

We serve Alamance, Chatham, and Orange County, and we'll give you a straight answer about what's going on with your plumbing. Call (336) 269-9882 or reach out through the contact form to schedule your service visit.
Call (336) 269-9882 Call for a Leak Inspection

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