Approval for works

Whether you are a property owner, contractor or developer, you may require approval before working near our assets.

Under Section 90 of the Water Services Act 2012, Water Corporation requires you to request approval if your proposed works are in, over, under or within the Prescribed Proximities to our assets defined below.

These proximities have been established to protect our assets from damage as well as ensuring that third parties building near our assets avoid costs and inconvenience associated with removing or altering your work as necessary to prevent damage.

Type of works Asset type Asset size Prescribed proximity
 Blasting All pipelines  All  1000m
 Pile driving All pipelines  All  100m
Buildings, structures and other obstructions
Including residential/commercial/industrial  buildings, pools, sheds, carports,
major developments, transport infrastructure, services, equipment installed on 
our assets, stockpiles, ground anchors, large trees
All assets  All 10 m either side of the asset
15 m above and below the asset
Other works 
Including movement of heavy vehicles, ground compaction, 
dewatering, earthworks, open and trenchless excavations
Water supply pipelines ≥ 300 mm diameter
 Sewer pressure mains  All
 Drainage pressure mains  All
Other works 
Water supply pipelines  <300 mm diameter  4m
Other works Sewer pipelines  All  2m
 Main drains  All

 Work that does not require approval

Light weight structures, fences and walls than can be readily removed
Planting and removing trees that have a mature height of less than 5 m  
Note that requirements still apply to these types of works – refer to Section 8 of our guidelines

For further details of the Prescribed Proximities and relevant legislation, refer to our guidelines.

Ready to apply? 

Use the form below to let us know about your project and to seek our approval for doing any of the following types of work in, over, under or within the Prescribed Proximities:

  • development of key infrastructure (such as freeways, railways, bridges, tunnels, major building developments.
  • installation of buried and overhead services
  • movement of heavy vehicles
  • causing excessive vibrations (such as blasting, pile driving, ground compaction)
  • dewatering
  • earthworks
  • open and trenchless excavations
  • planting and removal of trees
  • installation of equipment (such as telecommunications antennas) on our assets.

Make sure you have detailed information about the location of our assets before you apply. This includes Dial Before You Dig plans and potholing information (where required).

Please complete and attach to your application the Asset Protection Risk Assessment Form (APRA) to assist in the processing of your application. The relevant sections to be completed are shown on the example APRA form.


For applications to build residential, commercial or industrial buildings, sheds, garages, carports, retaining walls and swimming pools or spas please lodge your applications through BuilderNet.