Plumbing
Leak Detection in Union County & Central NJ
Leak detection that narrows down a hidden leak with meter, pressure and electronic tests, so any opening is as small as possible.
A water bill that keeps climbing, a stain spreading across a ceiling, or a warm patch on a floor can all point to a leak you cannot see. Leak detection means narrowing down the source as closely as possible before anything is opened. Our technicians begin with simple tests that separate a supply leak from a drain leak, then use electronic and camera equipment to close in on it. You get a plain explanation of the source and a written price for the repair. If water is actively coming through a ceiling, call 908-577-5579; we pick up around the clock, including holidays.
Common problems and how we handle them
Does my water meter show a hidden leak?
It can. Turn off every faucet and water-using appliance, then look at the meter. Many meters have a small triangle or dial, often called a leak indicator, that turns whenever any water is moving. If it turns while nothing is running, water is escaping somewhere on the pressurized side of the plumbing. For a slower leak, write down the reading, use no water for an hour or two, and compare. Rule out toilets first by putting food coloring in each tank and watching for color in the bowl without flushing.
Why would a ceiling stain appear far from the bathroom?
Water rarely drops straight down from where it escapes. It runs along joists, pipes and the back of drywall until it reaches a low point, so a stain can surface several feet from the source. A bathroom leak may come from a supply line, the drain under a tub, a failed overflow gasket, or worn grout and caulk around a shower. Some stains are not plumbing at all, such as an air conditioner condensate line or a roof leak. Pinning down the real source first avoids opening the wrong ceiling.
Is it a supply leak or a drain leak?
Answering that narrows the search quickly. Supply pipes are always under pressure, so a leak in one runs whether or not anything is turned on, and the meter keeps moving. Drain pipes carry water only when a fixture is used, so a drain leak appears after a shower, a flush or a load of laundry, then dries. Noting when the dampness shows up, and after which fixture, is one of the most useful things you can tell a plumber.
Can a pipe leak under a concrete floor?
Yes. Some supply and drain lines run beneath basement floors, and additions built on a slab often have piping in or under the concrete. A warm spot on the floor can mean a leaking hot water line. Damp patches that keep returning in the same place, cracks that stay wet, or the sound of running water with every fixture off are other signs. Isolating hot from cold and pressure-testing each line narrows it down before any concrete is cut.
How the job works
- First come the questions: when you notice the water, where it shows up and which fixtures were in use, followed by a meter check with everything off to see whether the pressurized side is losing water.
- Valves are closed in sequence to isolate hot from cold and one part of the house from another, and the meter or a pressure gauge shows which section is leaking.
- Pressurized lines are traced with electronic leak detection equipment, while suspect drains are run one fixture at a time and inspected with a camera where needed.
- The source is marked, and you are shown the smallest opening that will reach it, along with a written repair price.
- After the repair, the line is retested and the meter read again to confirm the loss has stopped.
Cost of leak detection
A leak is harder to find when water travels far from its source, when several lines share the same wall or ceiling, or when the pipe sits under finished surfaces or concrete. Some searches also call for testing both supply and drain lines. The repair depends on what the search uncovers. You see the price in writing before any work begins, with no hidden fees.
Why homeowners call Vanguard for leak detection
- Licensed and insured. We work under NJ Master Plumber license NJMPL 13344 and HVACR license 19HC00609600, and every job is done by our own technicians, never a subcontractor.
- Upfront pricing, free estimates on most jobs. You approve a written price before work begins. No surprise line items when the job is finished.
- 4.9 stars across 556+ Google reviews. Read what customers say.
- Answered 24/7. Our phone is answered around the clock, including holidays.
Related plumbing services
Areas we serve
We provide leak detection throughout Union, Middlesex, Somerset, and Essex counties, including:
Leak Detection questions
Will you have to cut into my wall or floor?
Reaching a hidden pipe usually takes some opening, but the point of leak detection is to keep it small and put it in the right place. Once the source is pinpointed, we show you where the opening will go and how large it needs to be before cutting. When it can be done, we reach pipes from a closet, a basement ceiling or the back side of a wall to spare finished surfaces.
Could the leak be something other than a pipe?
It may be. A toilet flapper or fill valve that lets water trickle into the bowl can raise a bill without leaving any stain. Water heater relief valves can discharge, washing machine hoses and ice-maker lines can crack, and a humidifier or condensate line can overflow. Outdoors, an irrigation system or a buried line to a hose connection may be leaking. Those get checked early in the search.
What can I do before the appointment?
Try the meter and toilet dye checks on this page, and note the time of day the dampness appears and which fixtures had been used. Photos of a stain taken a day or two apart show whether it is growing. If water is coming through a ceiling, close the main shutoff, and if you can reach the electrical panel without standing in water, switch off the breaker for any light or outlet near the leak. Hold off on painting over a stain, since that hides whether the leak has stopped.
The leak stopped on its own. Should I still have it checked?
A check is still worthwhile. A leak that comes and goes is often tied to one fixture, such as a shower drain that only leaks while the shower runs, or to rain, which points toward the roof or walls rather than the plumbing. Water that no longer shows can still be soaking insulation and framing out of sight, where it leads to rot and mold. Testing while the suspected fixture is in use usually settles whether a problem remains.
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