Non-invasive leak detection using acoustic equipment, thermal imaging and pressure testing. We find the leak AND fix it — in one visit, without unnecessary excavation.
Most leaks are invisible — buried under concrete slabs, inside walls, or underground. The traditional approach was to dig until you found wet ground, which is expensive, disruptive, and often unnecessary. Modern leak detection uses non-invasive technology to pinpoint the exact location of a leak before any ground is broken.
We use three primary methods, often in combination: acoustic listening equipment that amplifies the sound of water escaping from a pressurised pipe; thermal imaging cameras that detect temperature differences caused by water saturation in walls, floors and ceilings; and pressure testing that isolates sections of pipework to confirm which line is leaking and how severely.
A slab leak occurs when a water pipe running beneath or within your concrete slab floor develops a crack or pinhole. Signs include unexplained increases in your water bill, warm spots on the floor (if the hot water line is leaking), damp patches, or the sound of running water when all taps are off.
Using acoustic equipment, we can pinpoint the leak location to within centimetres without breaking up your slab. Once located, the repair options are: cut a small access hole in the slab to repair the specific section, or reroute the pipe above the slab to bypass the damaged section entirely (often the better long-term solution for older copper pipes that are likely to develop further leaks).
Underground supply lines between your water meter and the house can develop leaks from corrosion, tree root damage, ground movement, or age. Signs include a constantly spinning water meter (even with all taps off), wet patches in the yard, or a sudden spike in your water bill.
We use a combination of acoustic detection and pressure testing to locate the leak, then repair or replace the damaged section. For older galvanised or copper supply lines that are prone to multiple failures, we often recommend a full replacement with modern poly pipe — a one-time fix that eliminates the recurring problem.
Swimming pool leaks and irrigation system leaks can waste enormous volumes of water and cause ground subsidence. We pressure-test pool plumbing lines and irrigation zones to identify which line is leaking, then use acoustic or tracer-gas methods to pinpoint the exact location.
Many leak detection companies only locate the leak — they hand you a report and leave you to find a plumber to do the repair. O'Brien Plumbing does both. Our licensed plumbers carry the detection equipment AND the repair tools, so in most cases we find the leak and fix it in a single visit. No waiting for a second appointment, no coordination between two trades.
We use multiple detection technologies depending on the leak type and location:
| Method | How It Works | Best For | Accuracy |
|---|---|---|---|
| Acoustic Listening | Amplifies the sound of pressurised water escaping through a pipe wall or joint | Slab leaks, underground supply lines, mains leaks | Within 10–30 cm |
| Thermal Imaging | Infrared camera detects temperature differences caused by water evaporation or hot water leaks | Wall and ceiling leaks, underfloor heating, hot water pipe leaks | Identifies affected zone (30–50 cm) |
| Pressure Testing | Isolates sections of pipework and monitors pressure drop to identify which line is leaking | Confirming a leak exists, isolating which pipe is affected | Identifies the line, not the exact point |
| Tracer Gas | Injects a safe gas (hydrogen/nitrogen mix) into the pipe; gas escapes at the leak point and is detected at the surface | Very small leaks, pool plumbing, gas-tight confirmation | Within 5–15 cm |
| Moisture Mapping | Electronic moisture meters map the extent of water migration through walls, floors and ceilings | Insurance documentation, identifying full extent of damage | Maps affected area (not leak source) |
We typically combine 2–3 methods to triangulate the exact leak location before making any cuts or excavations.
Typical cost ranges for leak detection and repair on the Central Coast:
| Service | Cost Range | What's Included |
|---|---|---|
| Leak detection (locate only) | $250 – $500+ | Multi-method detection, written report, location marked |
| Leak detection + repair (same visit) | $350 – $800+ | Detection, excavation/access, pipe repair, pressure test |
| Slab leak repair (after detection) | $500 – $1,500+ | Concrete cutting, pipe repair/reroute, reinstatement |
| Pool leak detection | $300 – $600+ | Pressure test all lines, tracer gas, location report |
| Insurance leak report | $180 – $350 | Written report with photos, moisture mapping, cause documentation |
Source: O'Brien Plumbing cost guide (obrien.com.au). On-site diagnostic included. Fixed prices confirmed before any work starts. 7-year workmanship warranty on repairs.
O'Brien's non‑invasive leak detection for Central Coast homes and businesses is a methodical, evidence‑led process designed to find hidden leaks quickly and accurately while minimising damage. Our technicians combine acoustic listening, thermal imaging (FLIR), tracer gas, pressure testing and electronic locating in staged steps so we only expose finished surfaces when absolutely necessary.
Acoustic leak detection is often the quickest non‑intrusive method to narrow a location — especially for pressurised pipe leaks within slabs and under floors.
FLIR thermal cameras allow our technicians to visualise temperature differences on walls, ceilings and floors caused by leaking hot or cold water. Thermal imaging is powerful for:
The camera images are recorded and included in your written report to show the suspected run of moisture before any opening occurs.
Where acoustic or thermal scans suggest a pressurised leak we perform controlled pressure tests. By pressurising isolated sections with a calibrated rig and monitoring pressure decay, we confirm the presence and approximate magnitude of a leak without excavation.
If noise and thermal methods are inconclusive — for example with slow leaks in large cavities, behind multiple layers of cladding or under thick concrete slabs — we deploy a low‑concentration tracer gas. Using hydrogen/nitrogen mixes and sensitive sniffing detectors, the gas is injected into the pipe and its escape is followed above the leak point.
When a leak site is narrowed to a specific spot our pipe locator and ground microphone tools map the buried line and mark exact points for repair. We paint or peg an outline and photograph the site for your report and insurance documentation.
Before any cutting or excavation, we take moisture meter readings across the affected area to map moisture spread. Every stage is photographed and logged so you and your insurer have a clear factual record.
Our comprehensive leak detection service concludes with a written report (included in the $815 inc GST fee). The report contains:
After repairs (performed by O'Brien or another contractor) we re‑test and re‑scan the repaired zone to verify the leak has been eliminated. This final verification is critical for insurance and long‑term peace of mind.
Early detection of hidden leaks saves money and prevents widespread water damage, mould and rising damp. On the Central Coast you should arrange professional leak detection if you notice any of the following:
Our diagnostic and detection work is priced to be transparent and thorough. For homeowners and businesses across the Central Coast the comprehensive leak detection service is supplied at a flat diagnostic fee:
What that $815 covers:
Please note:
To schedule same‑day or emergency leak detection on the Central Coast call our Wyong office on (02) 4351 3665. We operate 24/7 for urgent water loss and risk situations.
Leak detection follows the same scientific principles for both homes and businesses, but the scope, risks and logistics differ. Below we outline practical differences and what to expect from O'Brien for each sector.
The Central Coast has regional factors that influence pipe life and leak risk. Targeted maintenance reduces the chance of hidden leaks and costly remediation.
Check your water meter monthly. A steady spin with all taps and appliances off indicates an active leak. Early detection is especially important where clay soils can hide slow leaks until they disturb slabs or landscaping.
High humidity on the Central Coast accelerates tank and fitting corrosion. Ensure hot water systems are serviced annually and that magnesium anodes are inspected/replaced as recommended by the manufacturer to extend tank life.
Coastal salt air corrodes flashings, nails and gutter fasteners. Keep gutters clean, replace corroded metal flashings promptly and inspect ridge and valley details after storms to prevent hidden roof leaks that track along timbers.
Eucalyptus and other established trees on Central Coast blocks have aggressive roots. Avoid planting close to drains and water lines; install root barriers or consider periodic CCTV inspections of sewer lines to detect ingress before structural damage occurs.
Many homes built from the 1960s to 1990s still have original copper or galvanised lines. In heavy clay soils or salt‑air environments these materials can corrode. When pipes are due for replacement consider polymer alternatives or relining that provide long‑term resilience.
Poor ventilation under timber floors and saturated soils increase the risk of rising damp and hidden leaks. Ensure vents are clear, observe timber health and investigate sudden humidity or efflorescence on lower walls.
A yearly inspection by a qualified technician from our Wyong team will pick up early corrosion, hairline leaks, or failing fittings, particularly important for properties near salt spray and in bushfire zones where roof integrity is critical.
We invest in purpose‑built, industry‑standard detection tools to ensure accuracy without unnecessary demolition. Using the right equipment reduces repair scope and speeds up resolution.
We use FLIR thermal cameras to map temperature differentials caused by leaking hot or cold water. Thermal imaging is non‑contact and fast — excellent for wall cavities, ceilings and external claddings where water trails create distinct thermal signatures.
Our ultrasonic detectors, hydrophones and correlator loggers pick up the sound of water escaping under pressure. Correlation allows us to mathematically pinpoint a leak along a run by comparing signals at two or more sensors.
For slow or deeply buried leaks we use low‑concentration hydrogen/nitrogen tracer gas and highly sensitive sniffers to trace the leak path to the surface. The gas is safe at industry‑used concentrations and provides a non‑destructive detection option.
Calibrated pressure rigs let us verify leaks by pressurising isolated segments and monitoring decay. This confirms the presence of a leak and helps estimate its severity without widespread excavation.
Pin and non‑contact moisture meters document moisture content across surfaces and behind finishes. Combined with thermal images, moisture mapping defines the wet zone for targeted intervention.
Electronic locators and ground microphones map buried services and mark points for repair. On the Central Coast these devices are essential to avoid disturbing tree root systems and to identify shallow services in sandy soils near the coast.
When you engage O'Brien for leak detection on the Central Coast you get a locally based, technically capable team operating out of Wyong with extensive regional knowledge and clear safety credentials.
When we combine acoustic correlation, thermal imaging and moisture mapping accuracy is high — most leaks are narrowed to within a small square metre or to a marked line along a pipe run. Tracer gas and pressure testing further confirm exact points when the leak is slow or in deep soil. The goal is to ensure any excavation or cut is precisely targeted rather than exploratory.
Yes. We use low‑concentration tracer gas mixes (hydrogen/nitrogen) in line with industry safety standards and local regulations. The small quantities we use are not explosive or harmful in properly controlled procedures. Our technicians follow strict safety steps and ventilate spaces if required.
Typical residential detection visits last from 1.5 to 4 hours depending on complexity. Simple acoustic scans and thermal surveys can be completed quickly, while tracer gas or extended correlation across a large slab or commercial system may take longer. We’ll give you an estimated timeframe when we book the job.
Yes. Our written report includes annotated thermal images, acoustic correlation data, pressure test results and photographs of the site. This documentation is tailored for use in insurance claims and for quotations to repair contractors.
O'Brien provides both detection and repair services. Once the leak is accurately located we can quote and undertake the repair (pipe relining, spot replacement, slab penetration and patching, roof flashing repair, etc.). Repairs are priced and scheduled separately to the $815 detection fee.
Thermal imaging captures transient temperature differences. If a leak is intermittent or has stopped (e.g. after a valve change or appliance fault resolved), the thermal signature can cool or dry. That’s why we combine thermal images with moisture meters, acoustic tests and pressure checks to confirm active leaks before any excavation.
Yes. Acoustic correlation and tracer gas are commonly used to locate slab leaks without unnecessary demolition. We use pipe locators to trace the line and then coordinate a minimal coring or trenching approach only at the confirmed point.
A spinning meter usually indicates water loss. Call us and we will perform an on‑site meter isolation test, acoustic correlation and, if needed, a tracer gas survey to locate underground or concealed pipe leaks. Rapid action avoids larger damage and landscaping loss.
Yes. Acoustic detection depends on leak noise reaching accessible points — very slow leaks or runs heavily insulated may be harder to hear. Thermal imaging needs a temperature differential to be visible; hot and cold lines in equilibrium with ambient temperature can be less obvious. That’s why O'Brien uses a layered approach, combining tools to overcome individual limitations.
We use clean mats, protective boards and dust control measures when accessing floors and roof spaces. Any probe holes or access points we make are kept to the minimum size and documented for repair. Safety and respect for your home are integral to our work practices.
O'Brien's Wyong‑based leak detection team services the whole Central Coast with rapid response and local knowledge. We commonly attend jobs in:
We also attend surrounding suburbs across the Central Coast region. If you're unsure whether we cover your street, call (02) 4351 3665 and our team will assist.
For professional, non‑invasive leak detection that minimises demolition and provides clear documented findings, contact our Wyong office on (02) 4351 3665. O'Brien combines licensed plumbing and roofing expertise with modern detection technology to find hidden leaks fast and advise on the most economical repair strategy for Central Coast properties.
We use acoustic listening equipment that amplifies the sound of water escaping from a pressurised pipe, combined with thermal imaging to detect temperature differences. This pinpoints the leak to within centimetres without breaking up the slab.
Yes. Unlike dedicated leak-detection companies that only locate the problem, our licensed plumbers carry both detection equipment and repair tools. We find and fix in one visit.
Common signs: unexplained water bill increases, the sound of running water when all taps are off, warm spots on floors, damp patches on walls or ceilings, a water meter that spins when nothing is running, or musty smells.
Yes. We pressure-test pool plumbing lines to identify which line is leaking, then use acoustic or tracer-gas methods to pinpoint the exact location.
Many home insurance policies cover the cost of locating a leak (detection) and the resulting water damage, though not always the repair of the pipe itself. We provide documentation for your insurer.
Suspect a Hidden Leak? We'll Find It.
Non-invasive detection and same-visit repair. No unnecessary digging.