Our projects » Water mains replacements

Water mains replacements

We periodically replace aged and damaged pipes to:

  • reduce the risk of bursts
  • minimise unexpected repairs
  • reduce supply interruptions, and
  • ensure continued water quality.

We replace water mains as they near the end of their serviceable life.

We replace up to 20 kilometres of pipes a year at an annual cost of approximately $4 million.



Pipe replacement

Where possible, pipes are replaced using ‘trenchless’ technology. This means that pipes are replaced without digging new trenches, reducing the impact on residents and the local environment. Two main methods are used:

  • Pipe bursting: a new pipe is pulled through the old one, expanding and cracking the old pipe.
  • Directional drilling: a computer-controlled drill bores horizontally  underground, and the new pipe is pulled through the bore. This method is preferred when a new alignment is needed.

Where it is impractical to use trenchless methods, we will excavate the old pipe and lay a new one in its place, or lay the new pipe in a similar alignment. 

  • Open trench: a new pipe is laid parallel to existing pipe in excavated open trench. The old pipe is abandoned and left in the ground.
  • Lift and relay: The old pipe is removed by digging and new pipe is laid in similar position of old pipe. This method is required if space is limited for new pipe.



Planning and works

We record all pipe failures and produce forecasts for future replacements.

During works, affected residents and businesses are connected to a temporary water supply line: a thin black or blue plastic pipe, typically running next to the the footpath along front fences or boundaries. The temporary line may cross footpaths and driveways, and remains in place throughout construction.

When a section of pipe has been completed, pipes are flushed, water quality is tested, and customers are reconnected.

Nature strips, pavement and roads affected by the works are restored within a few weeks. The restoration work is coordinated and completed in conjunction with the local council.

Public facilities such as schools and hospitals are not compromised by works.



Impacts on residents and businesses


Works notifications

We issue works notifications to all customers affected by construction works. The notifications include:

  • scope of works
  • temporary water supply arrangements
  • estimated completion
  • any property access or reinstement needs, and
  • our contact details.


Public safety

To protect pedestrians, motorists and residents we erect barricades around equipment, tools, storage facilities, and any works which might pose a hazard or a safety risk.


Property access

Construction works may impact on-street parking. We will notify residents if the works affect property access.


Traffic management

We erect traffic signs at either end of the works area. We use traffic management staff at intersections or partial road closures.


Our storage facilities

We usually have storage sheds and facilities on work sites for workers, equipment, materials and tools.

Storage facilities are usually located on vacant lots, nature strips, median strips or car parks for minimum impact.

Storage shed locations are always coordinated with local councils.

We endeavour to ensure minimal impact on local residents.


Duration of works

Individual jobs can last from a few days to few months.

Our contractors have several work crews working across the region. The work crew may not always be on site.


Working hours

Our normal work hours are 7 am to 5 pm, Monday to Friday.


Have your say

We listen to your feedback. Please use the form below to ask us a question or let us know how we're performing.

Please tell us your name for a personalised response
If you would like us to respond in writing please provide a valid email
If you would like us to contact you by phone, please provide your daytime contact number