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Documented Leak Detection Scenarios · Gauteng

Leak Detection Case Studies.

Every leak tells a story — a damp patch that won't dry, a water bill that tripled overnight, a pool losing centimetres a day. Below are real-world scenarios from across Gauteng showing how each hidden leak was pinpointed without digging first, and what it saved the property owner.

60Scenarios Below
No-DigDetection First
Same-DayResponse
GautengWide Coverage
Residential & Thermal

Hidden Leaks Inside Gauteng Homes

Slab leaks, geyser lines and concealed damp — found through tile and concrete without lifting a floor. 14 cases

Waterkloof, PTAThermal + Acoustic

Warm damp patch spreading across a tiled kitchen floor

The Situation

A Waterkloof homeowner noticed kitchen tiles that stayed slightly warm and never dried after mopping. Two plumbers had quoted to lift the entire floor to find it.

How We Found It

A thermal scan showed a hot plume tracking from the geyser feed across the slab. Acoustic listening confirmed the exact hiss point — a pinhole in the hot-water line, 1.1m from the wall.

Outcome

One tile lifted instead of the whole floor. Owner saved an estimated R18 000 in unnecessary demolition.

Sandton, JHBAcoustic

Ceiling stain in a double-storey that kept coming back

The Situation

A brown ring on a Sandton living-room ceiling was repainted twice and returned within weeks. The owner assumed a roof leak, but it appeared even in dry weather.

How We Found It

Acoustic correlation traced flow noise to a pressurised line feeding the upstairs en-suite, not the roof. The leak was inside the inter-floor cavity.

Outcome

Pinpointed to a single coupling. One access panel, clean repair, and no more recurring stain.

CenturionThermal + Moisture

Insurance demanded proof before approving a claim

The Situation

A Centurion family had water damage to a bedroom wall and their insurer wouldn't approve the claim without documented evidence of the source.

How We Found It

Thermal imaging plus moisture-meter mapping produced a clear before-and-after profile showing the leak origin behind the shower wall, with date-stamped photos.

Outcome

Insurance-ready report submitted the same day. Claim approved without the back-and-forth that had stalled it for weeks.

Bryanston, JHBAcoustic + Thermal

Geyser overflow that wasn't the geyser

The Situation

A Bryanston home had a constantly trickling overflow pipe. A plumber replaced the geyser valve twice with no change.

How We Found It

Thermal and acoustic checks showed the geyser was fine — the trickle came from a leaking hot line in the roof void feeding back down the overflow route.

Outcome

Correct fault found after two wasted valve replacements. Targeted repair in the roof, trickle stopped.

Lynnwood, PTAThermal

Cold damp creeping up a bedroom wall

The Situation

Rising damp marks climbed a Lynnwood bedroom wall each winter and the family worried about the foundation.

How We Found It

Thermal imaging separated genuine plumbing moisture from condensation. The pattern matched a slow leak in a cold supply line behind the skirting, not structural rising damp.

Outcome

Saved an expensive and unnecessary damp-proofing job. The real cause was a single pipe.

Roodepoort, WRAcoustic

Hissing sound behind a bathroom wall at night

The Situation

A Roodepoort owner could hear faint hissing behind the bathroom wall when the house was quiet, but saw no water.

How We Found It

Acoustic amplification located the hiss to a pressurised joint inside the cavity wall, before it had broken through to the surface.

Outcome

Caught early — repaired before it caused ceiling or wall damage. Classic case of fixing it before it became visible.

Garsfontein, PTAThermal + Acoustic

Underfloor heating zone that stayed cold

The Situation

One room's underfloor heating in a Garsfontein home never warmed up, and the owner suspected a leak in the heating loop.

How We Found It

Thermal imaging confirmed a cold dead-zone in the loop; acoustic checks located the failure point in the manifold feed under the screed.

Outcome

Leak isolated to one loop section. Minimal screed opening rather than relaying the whole floor.

Faerie Glen, PTAAcoustic

Water meter spinning with every tap closed

The Situation

A Faerie Glen homeowner saw the meter creeping even with all taps off and feared a hidden burst.

How We Found It

After confirming continuous flow at the meter, acoustic tracing followed the supply line and located the leak under the entrance hall slab.

Outcome

Pinpointed to under 0.5m. One small slab opening, leak repaired, meter stopped creeping.

Bedfordview, EKUThermal

Mould returning in the same corner after repainting

The Situation

A Bedfordview bedroom corner kept growing mould weeks after being treated and repainted.

How We Found It

Thermal imaging revealed a persistent cold-moisture signature behind the wall fed by a leaking pipe, explaining why surface treatment never lasted.

Outcome

Source removed, not just the symptom. Mould treated for good once the pipe was fixed.

Krugersdorp, WRAcoustic + Thermal

Two leaks masquerading as one

The Situation

A Krugersdorp home had damp in two rooms and assumed a single big leak somewhere central.

How We Found It

Combined acoustic and thermal survey actually found two separate small leaks — a hot line and a cold line — that happened to surface near each other.

Outcome

Both pinpointed in one visit. Avoided chasing a phantom 'big' leak that never existed.

Pretoria, PTAThermal

Damp ceiling under a flat concrete roof

The Situation

A Pretoria home with a flat concrete roof had damp blooming on the ceiling and feared a roof slab failure.

How We Found It

Thermal imaging distinguished a plumbing leak in the roof-level supply from rainwater ingress, localising the source.

Outcome

Saved a costly roof investigation. The fault was a pipe, not the slab.

MidrandThermal + Moisture

New-build handover leak the developer denied

The Situation

A Midrand new-build owner had damp at handover the developer insisted was 'just construction moisture'.

How We Found It

Thermal and moisture mapping proved an active hot-water leak behind the wall, not residual building damp.

Outcome

Evidence forced the developer to fix it under the build warranty.

Johannesburg, JHBAcoustic

Leak under a heritage tiled floor

The Situation

A Johannesburg home with an irreplaceable original tiled floor had a suspected leak beneath it.

How We Found It

Acoustic detection pinpointed the leak to a tight area so only minimal tiles needed lifting.

Outcome

Heritage floor preserved; a handful of tiles lifted instead of the whole room.

Benoni, EKUAcoustic

Persistent low pressure no one could explain

The Situation

A Benoni home had chronically low water pressure with no obvious leak.

How We Found It

Acoustic survey found a partially split underground feed bleeding off pressure before it reached the house.

Outcome

Pressure restored after the split was located and repaired.

Pool Leak Detection

Pools Losing Water Across Gauteng

Shell, plumbing, fittings, lights and equipment — flat-rate inspections that separate evaporation from a real leak. 11 cases

Fourways, JHBPressure + Dye

Pool dropping 3cm a day every summer

The Situation

A Fourways homeowner was topping up constantly and blamed evaporation, but the loss continued on cool, overcast days.

How We Found It

A bucket test ruled out evaporation. Pressure-testing the circulation lines isolated a failed return-line fitting below the paving, confirmed with dye.

Outcome

Leak located to a single fitting — no need to re-plumb the whole pool. Flat-rate inspection with WhatsApp video report.

Bedfordview, EKUStructural Dye

Cracked pool light niche nobody suspected

The Situation

A Bedfordview pool kept losing water to roughly the light's level then stopped. Two pool companies had replaced the pump seal with no change.

How We Found It

Static water-level analysis pointed to the light. Dye testing confirmed water drawing into a hairline crack in the niche conduit.

Outcome

Correct fault identified after months of wrong fixes. Owner stopped paying for parts that were never the problem.

Pretoria EastPressure Test

New estate pool leaking within a year of build

The Situation

A recently built Pretoria East home had a pool losing water fast. The owner needed proof of a workmanship defect for the builder.

How We Found It

Line-by-line pressure testing found the suction line failing to hold — a poorly glued joint under the deck. Documented with readings and photos.

Outcome

Independent report gave the owner leverage. Builder repaired the defect under warranty.

Sandton, JHBDye + Pressure

Spa spilling into the pool, draining both

The Situation

A Sandton property with a raised spa-and-pool combo was losing water from both and couldn't tell which was at fault.

How We Found It

Isolating the spa circulation and dye-testing the shared weir showed the spa shell seam was the culprit, bleeding into the pool below.

Outcome

Single seam identified rather than suspecting the entire shared system. Repair scoped precisely.

CenturionPressure Test

Auto-filler hiding a real leak

The Situation

A Centurion pool with an automatic top-up valve never showed a low level, but the water bill quietly climbed.

How We Found It

We disabled the auto-filler and measured true loss, then pressure-tested to find a cracked skimmer throat feeding the leak.

Outcome

The auto-filler had masked the problem for months. Found, quoted, and the bill brought back down.

Benoni, EKUDye Test

Fibreglass pool with a slow structural weep

The Situation

A Benoni fibreglass pool lost a steady trickle with no visible crack and no plumbing fault found.

How We Found It

Methodical dye testing along the shell located a fine stress crack near a step, invisible to the eye underwater.

Outcome

Pinpointed the exact weep point so the repair could be a targeted patch, not a reline.

Randburg, JHBPressure + Dye

Pool losing water only when the pump ran

The Situation

A Randburg owner noticed the level dropped during filtration but held overnight, pointing to pressure-side plumbing.

How We Found It

Running vs static testing confirmed a pressure-only leak; the return line under the deck failed to hold pressure.

Outcome

Diagnosis matched the symptom exactly. Repair limited to one pressurised section.

Roodepoort, WRStructural Dye

Vanishing water tied to the water feature

The Situation

A Roodepoort pool with a feature wall lost water faster when the feature ran. Owner assumed the pool shell.

How We Found It

Dye testing isolated the loss to the feature's return penetration, not the pool itself.

Outcome

Shell cleared, feature plumbing identified as the fault. Saved a needless shell investigation.

Kempton Park, EKUPressure Test

Complex pool plant room with multiple suspects

The Situation

A Kempton Park complex pool with a busy plant room was losing water and the trustees needed the specific fault, not guesswork.

How We Found It

Systematic pressure testing of each line isolated a single leaking valve union in the plant room manifold.

Outcome

One union, clearly identified, with photos for the trustees. Dispute over 'the whole system' avoided.

Boksburg, EKUDye + Level Test

Liner pool losing water at the steps

The Situation

A Boksburg vinyl-liner pool dropped to step level and stopped, the classic liner-tear signature.

How We Found It

Level analysis plus dye confirmed a liner tear at the top step seam drawing water out.

Outcome

Tear located precisely for a patch rather than a full liner replacement quote.

MidrandPressure Test

Pool and irrigation sharing one leak

The Situation

A Midrand property's pool and garden irrigation ran off linked plumbing, and water vanished from both.

How We Found It

Isolating the two systems and pressure testing each showed the leak was on the shared supply, not the pool shell.

Outcome

Correct system identified, sparing a needless pool shell inspection.

Underground & Tracer Gas

Buried Mains & Driveway Leaks

Leaks below paving, lawns and concrete — located precisely so only the leak point gets opened up. 8 cases

MidrandTracer Gas

Wet patch on a paved driveway, dry everywhere else

The Situation

A Midrand homeowner had one permanently damp area on a dry interlock driveway, plus a creeping water bill.

How We Found It

The mains was charged with tracer gas; a probe detected it surfacing through the joints above a cracked supply pipe, 600mm down.

Outcome

Three pavers lifted instead of trenching the whole driveway. Pipe repaired, paving relaid, bill normal.

Krugersdorp, WRAcoustic + Correlation

Mains leak somewhere under a 40m garden run

The Situation

Water pooled at the bottom of a sloped Krugersdorp garden, but the leak could be anywhere along a long buried line.

How We Found It

Two acoustic sensors and a correlator measured sound delay along the pipe and triangulated the leak to within half a metre — uphill of where it surfaced.

Outcome

A 1m excavation instead of trenching 40m of established garden. Mature plants and irrigation left intact.

CenturionTracer Gas

Soggy lawn with no obvious low point

The Situation

A Centurion lawn had a permanently soft, soggy stretch with no visible water and a rising account.

How We Found It

Tracer gas in the irrigation main surfaced at a single spot, marking a cracked fitting under the turf.

Outcome

Pinpointed to one fitting. A spade-width hole rather than lifting the whole lawn.

Sandton, JHBCorrelation

Estate common supply losing pressure

The Situation

A Sandton estate had dropping pressure on a shared line and no idea where along the buried route the loss was.

How We Found It

Leak-noise correlation along the common main pinpointed the burst between two valve chambers.

Outcome

Excavation limited to one section of the estate road rather than exploratory digging.

Pretoria EastTracer Gas

Driveway crack leaking under fresh paving

The Situation

A Pretoria East owner had recently paved over the supply line and now had a wet seam they couldn't trace.

How We Found It

Tracer gas surfaced precisely through one paver joint, marking the cracked pipe beneath without lifting the new paving blind.

Outcome

Single block lifted at the exact point. New paving otherwise untouched.

Roodepoort, WRAcoustic + Correlation

Borehole-to-house line losing water underground

The Situation

A Roodepoort property fed from a borehole was losing pressure on the buried run to the house.

How We Found It

Acoustic correlation along the poly line located the split where it crossed under the driveway.

Outcome

One targeted dig at the crossing instead of exposing the full run.

Boksburg, EKUTracer Gas

Water surfacing in the street, source unclear

The Situation

A Boksburg homeowner had water appearing at the kerb but couldn't tell if it was theirs or the municipality's.

How We Found It

Tracer gas in the property's supply confirmed the leak was on their side, just inside the boundary wall.

Outcome

Responsibility settled with evidence, and the leak located for a clean boundary repair.

Benoni, EKUTracer Gas

Wet boundary wall footing

The Situation

A Benoni owner had a permanently damp boundary wall footing with no rain to explain it.

How We Found It

Tracer gas in the perimeter supply line surfaced at the footing, confirming a buried pipe leak against the wall.

Outcome

Located to the wall line for a narrow, targeted excavation.

High Water Bill Investigation

When the Bill Doesn't Add Up

Unexplained municipal charges traced to a physical cause — with documentation for a bill dispute. 7 cases

Randburg, JHBBill + Meter Analysis

Water bill tripled with no visible leak anywhere

The Situation

A Randburg household's bill jumped to triple in one cycle. No damp, no sound, nothing visible.

How We Found It

A controlled meter test (everything off, meter still creeping) confirmed a real leak. Zone isolation tracked the loss to the irrigation supply line.

Outcome

Leak fixed and consumption documented before and after — evidence for a partial municipal adjustment.

Roodepoort, WRZone Isolation

Running toilet that wasn't — a silent cistern leak

The Situation

A Roodepoort owner was certain there was a buried leak after months of high bills. Everything looked and sounded fine.

How We Found It

Zone isolation cleared the underground supply. A dye test in each cistern exposed one silently weeping flush valve passing thousands of litres a month.

Outcome

A R150 valve, not the major dig they'd braced for. Bill dropped the following cycle.

CenturionMeter Analysis

Empty rental property still using water

The Situation

A Centurion landlord's vacant rental kept registering consumption between tenants.

How We Found It

Meter monitoring confirmed continuous overnight flow; isolation found a failed pressure valve bleeding to drain.

Outcome

Resolved before the next tenant moved in. Documented for the owner's records.

Sandton, JHBZone Isolation

Bill dispute that needed hard evidence

The Situation

A Sandton homeowner was sure the municipal reading was wrong and wanted proof before disputing it.

How We Found It

We logged the meter, isolated zones, and proved a genuine garden-line leak rather than a billing error.

Outcome

Honest finding — it was a real leak. Fixed, with before/after data for the owner's submission.

Benoni, EKUMeter + Zone Test

Slowly climbing bill over six months

The Situation

A Benoni family's bill crept up gradually rather than spiking, making it easy to ignore until it doubled.

How We Found It

Meter logging caught a low but constant night-flow; isolation traced it to a buried garden-tap line.

Outcome

Gradual leak caught and fixed. Owner shown how to spot the early signs next time.

Krugersdorp, WRZone Isolation

High bill traced to a neighbour's shared line

The Situation

A Krugersdorp owner on an older shared-supply arrangement had an inexplicable bill.

How We Found It

Zone testing revealed the loss was on a shared feed also serving an adjacent stand — not solely their usage.

Outcome

Clarified responsibility with evidence and located the actual leak point on the shared run.

MidrandMeter + Zone Test

Estate home with a bill double the neighbours'

The Situation

A Midrand estate homeowner's bill was double comparable houses with identical occupancy.

How We Found It

Meter logging confirmed excess night-flow; zone isolation traced it to a buried irrigation solenoid stuck part-open.

Outcome

Single faulty solenoid found and replaced; bill realigned with neighbours'.

Commercial

Leaks on Commercial Sites

Offices, complexes and industrial sites — where downtime and shared meters raise the stakes. 7 cases

Kempton Park, EKUThermal + Acoustic

Sectional-title complex with a soaring shared bill

The Situation

A Kempton Park complex body corporate faced a shared water account climbing monthly across 20+ units with no obvious culprit.

How We Found It

We worked the common supply zone by zone with thermal and acoustic and isolated the loss to a burst common-area irrigation main behind a retaining wall.

Outcome

One leak resolved a months-long dispute over who was wasting water. Reported to trustees with full evidence.

Johannesburg CBDTracer Gas

Office block: ceiling damp two floors below a plant room

The Situation

A JHB office had damp on a tenant's ceiling, the suspected source two floors up, with no appetite for opening every slab.

How We Found It

Tracer gas in the suspect line surfaced at a single point, confirming a riser leak rather than the slab. Detection done after hours.

Outcome

Targeted riser repair. No exploratory demolition across three floors, no tenant downtime.

MidrandAcoustic

Warehouse slab leak threatening stored stock

The Situation

A Midrand warehouse had water seeping across a section of floor near palletised stock.

How We Found It

Acoustic detection on the pressurised supply under the slab located the leak before it spread further into the storage bay.

Outcome

Found fast and contained. Stock relocated only from the affected zone, not the whole floor.

Sandton, JHBThermal

Restaurant kitchen with recurring floor moisture

The Situation

A Sandton restaurant kept getting moisture under kitchen equipment, a hygiene and slip risk during service.

How We Found It

Thermal imaging during a quiet period mapped a hot-water leak under the prep area without tearing up the floor mid-trade.

Outcome

Located out of service hours. Repair scheduled around the kitchen, not the other way around.

Roodepoort, WRAcoustic + Correlation

School with a mystery leak across the grounds

The Situation

A Roodepoort school had high consumption and damp patches across a large campus with extensive buried pipework.

How We Found It

Correlation along the main grid narrowed a sprawling search to one section between two buildings.

Outcome

Days of guesswork avoided. One excavation on a working campus rather than many.

CenturionTracer Gas

Retail centre with a slab leak under tenant shopfront

The Situation

A Centurion retail centre had moisture rising in a tenant's shopfront and needed minimal disruption to trade.

How We Found It

Tracer gas pinpointed the leak under the shopfront slab to a small area near the entrance.

Outcome

Tenant kept trading; only a small section was opened for repair.

Boksburg, EKUAcoustic

Factory ablution block leaking into production

The Situation

A Boksburg factory had water tracking from an ablution block toward the production floor.

How We Found It

Acoustic detection on the ablution supply located the leak before it reached machinery.

Outcome

Contained quickly with minimal disruption to the production line.

CCTV Drain Inspection

Blocked, Cracked & Collapsed Drains

Camera inspection to see the real fault before deciding how to fix it. 7 cases

Boksburg, EKUCCTV Inspection

Drain that blocked again weeks after every clearing

The Situation

A Boksburg home had a recurring sewer blockage. Rodding cleared it each time but it always returned.

How We Found It

A CCTV camera revealed root intrusion through a cracked joint about 8m from the inspection eye — the real reason it kept re-blocking.

Outcome

Root cause identified on screen with distance marked. Owner could choose a permanent fix instead of endless unblocking.

Sandton, JHBCCTV Inspection

Pre-purchase drain check on a luxury home

The Situation

A Sandton buyer wanted the drains inspected before transfer on an older high-value property.

How We Found It

CCTV surveyed the full run and flagged a partially collapsed section the seller hadn't disclosed.

Outcome

Buyer negotiated the repair cost off the price, armed with on-screen evidence.

CenturionCCTV + Jetting

Slow drains across a whole townhouse complex

The Situation

A Centurion townhouse complex had sluggish drainage in multiple units pointing to a shared-line problem.

How We Found It

CCTV found heavy grease and scale build-up in the common sewer; jetting cleared it and the camera confirmed a clean bore after.

Outcome

One coordinated clean fixed every affected unit. Before-and-after footage for the body corporate.

Roodepoort, WRCCTV Inspection

Sewage smell with no visible blockage

The Situation

A Roodepoort home had a persistent sewage odour but drains that seemed to run fine.

How We Found It

CCTV located a cracked pipe venting gas under the patio — flowing, but leaking foul air through the defect.

Outcome

Hidden defect found that no plunger or rod would ever reveal. Repair scoped exactly.

Benoni, EKUCCTV Inspection

Garden subsidence over a suspected drain

The Situation

A Benoni lawn was sinking in a line, hinting at a failing drain or washout beneath.

How We Found It

CCTV confirmed a displaced joint leaking into the surrounding soil and causing the subsidence.

Outcome

Cause of the sinking lawn confirmed before any digging. Targeted repair planned.

Kempton Park, EKUCCTV + Jetting

Restaurant grease blockage shutting the kitchen

The Situation

A Kempton Park restaurant's kitchen drain backed up mid-service, forcing an early close.

How We Found It

CCTV showed a solid grease plug; high-pressure jetting cleared it and the follow-up scan confirmed full flow.

Outcome

Kitchen back in service the same day, with advice on grease management to prevent a repeat.

Johannesburg, JHBCCTV Inspection

Recurring backups in an old inner-city building

The Situation

A Johannesburg building had repeated drain backups blamed on tenant misuse.

How We Found It

CCTV revealed a sagging 'belly' in the old sewer line collecting waste — a structural fault, not misuse.

Outcome

Real cause documented, ending the blame and pointing to the correct repair.

Pipe Relining

No-Dig Pipe Relining

Cured-in-place repairs that rebuild a pipe from the inside — no trenching. 6 cases

Soweto, JHBCCTV + Relining

Cracked drain under a new paved courtyard

The Situation

A Soweto homeowner had a damaged drain running beneath a freshly paved courtyard they had no wish to dig up.

How We Found It

CCTV confirmed a cracked but intact pipe — a candidate for CIPP relining, which cures a new pipe inside the old one with no excavation.

Outcome

Drain relined from existing access points. Brand-new paving left untouched.

Sandton, JHBCCTV + Relining

Collapsed section under a mature garden

The Situation

A Sandton estate had a failing drain beneath decades-old landscaping the owner wanted to preserve.

How We Found It

Camera survey confirmed the pipe could be relined rather than dug out. CIPP restored structural integrity from access points.

Outcome

No-dig repair saved an established garden from being trenched.

CenturionCCTV + Relining

Drain failing under a driveway slab

The Situation

A Centurion home's drain was cracking under a solid concrete driveway, with full excavation looking brutal.

How We Found It

CCTV graded the damage as relinable; a cured-in-place liner rebuilt the pipe internally.

Outcome

Driveway slab preserved. Repair done through the existing chambers.

Roodepoort, WRCCTV + Relining

Root-damaged sewer the owner kept jetting

The Situation

A Roodepoort owner jetted roots out of a sewer every few months but the cracks let them straight back in.

How We Found It

CCTV confirmed the host pipe was sound enough to reline; the new liner sealed out the roots permanently.

Outcome

Endless re-jetting replaced with a one-time no-dig fix.

Boksburg, EKUCCTV + Relining

Cracked pipe under a structural wall

The Situation

A Boksburg property had a drain failing directly beneath a load-bearing wall — excavation would have been a nightmare.

How We Found It

Relining was confirmed viable by camera, avoiding any disturbance to the foundation.

Outcome

Structural risk and cost of digging under the wall both eliminated.

MidrandCCTV + Relining

Cracked stormwater line under a parking area

The Situation

A Midrand commercial site had a cracked line under a busy paved parking area.

How We Found It

CCTV confirmed relining was viable, avoiding closing the parking for excavation.

Outcome

No-dig repair kept the parking open throughout.

Honest Note

About These Case Studies

These are representative scenarios drawn from the kinds of jobs we handle across Gauteng each week. Property details and identifying information have been changed to protect customer privacy — but the symptoms, detection methods and outcomes reflect genuine real-world leak detection work. If your situation looks like one of these, it almost certainly is one of these. Give us a call and we'll talk it through.

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