Overview of the Leak Issue

At a multi-unit property on Potter Street in Black Rock VIC 3193, our team at Your Choice Plumbers was contacted by the body corporate manager after receiving unusually high water bills across the complex.

The site consisted of four single-storey units built in the 1970s, all connected via a shared 32mm main water supply line, with individual sub-meters feeding each unit. Initial discussions with the owners confirmed that individual usage was normal, which shifted focus to the shared supply line.

Initial Investigation and Key Findings

As an experienced plumber black rock, we began by gathering detailed information from the body corporate and residents.

Testing confirmed:

  • Individual meters → normal usage
  • Main meter → continuous flow

This confirmed the leak was occurring on the main shared supply line running through the driveway.

Challenges with Underground Leak Detection

Unlike typical leaks, there were no visible signs.

Due to sandy soil conditions in Black Rock VIC 3193, water was being absorbed rather than surfacing — making visual detection impossible.

This is a common challenge in coastal areas and highlights why professional leak detection melbourne services are critical.

Acoustic Leak Detection and Pinpointing

We arranged specialised acoustic detection using:

  • Line tracing
  • Ground microphones
  • Acoustic listening devices

After approximately one hour, the leak was pinpointed under the driveway between Units 3 and 4.

Excavation and Leak Exposure

We:

  • Cut a 600 x 600 section of concrete
  • Excavated to approx. 600mm depth

Once exposed, the issue was clear.

Cause of the Leak

The original galvanised steel pipe (1970s installation) had corroded and failed.

This type of deterioration is common in older infrastructure and often leads to hidden underground leaks.

Repair and System Restoration

We carried out a controlled repair using a 32mm Dura Full Circle Repair Clamp, restoring the integrity of the pipe.

Before reinstating supply, we performed a critical step:

All unit lines were disconnected and fully flushed

This prevented:

  • Blocked mixer cartridges
  • Damaged tap strainers
  • Toilet inlet valve issues

After flushing:

  • All units reconnected
  • Taps and toilets tested
  • System confirmed operational

Critical Compliance Finding – High Water Pressure

After restoring supply, we tested the main water service pressure.

Recorded pressure: 740 kPa

This is well above the AS/NZS 3500 recommended limit of 500 kPa, and does not account for pressure spikes during low-demand periods (such as overnight).

High pressure is one of the leading causes of:

  • Pipe failures
  • Flexi hose bursts
  • Premature plumbing system damage

Pressure Regulation Upgrade

To bring the system into compliance, we installed a:

Zurn Lead-Free ZPR Pressure Reducing Valve (32mm)

This upgrade:

  • Reduced pressure to compliant levels
  • Protected the entire complex
  • Prevented future failures

This is a critical upgrade we often recommend when dealing with older infrastructure and is part of our broader [pressure regulating valve] solutions.

Surface Restoration and Completion

We restored the excavation area by:

  • Backfilling with sand
  • Applying cold mix asphalt (Dingo brand)
  • Compacting in layers

Driveway reinstated with minimal disruption.

Outcome and Client Result

  • Leak accurately located and repaired
  • Water loss eliminated
  • System brought into pressure compliance
  • Internal plumbing protected through flushing
  • Insurance-ready report provided
  • Long-term upgrade recommendations issued

The body corporate and residents were extremely satisfied with the structured approach and minimal disruption.

Compliance & Prevention Insight

This case highlights how underground leaks and excessive pressure often go hand-in-hand in older systems.

Without structured diagnosis and pressure control, failures like this are likely to repeat.

Compliance with Australian Standards

All work carried out by [Your Choice Plumbers] is completed in accordance with AS/NZS 3500, ensuring safe and compliant plumbing systems.

In simple terms, this means your plumbing is tested and installed to strict national standards — helping protect your property from leaks, water damage, and costly failures.

Our Home Plumbing Experts Approach

As part of our Home Plumbing Experts approach, we focus on both repair and prevention.

We offer a Complimentary Property Protection Audit as part of our service, assessing key areas like water pressure, hot water temperature, and flexible hoses — helping homeowners stay ahead of potential plumbing failures and avoid unexpected water damage.

Learn More About Our Water Leak Detection Services Melbourne