Draft Guidelines for the Reuse of Greywater in Western Australia

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Details of the treatment and disposal systems including:
– proposed location of greywater system and reuse area including the position of
irrigation lines/trench;
– method of construction of surface irrigation disposal area bed, including the
materials to be used; and
– where a split irrigation system is used; details of mechanisms to ensure an
even discharge to each area and to prevent overloading of individual areas.
The application, inspection and local government report fees as currently prescribed.
Failure to supply all requested information will delay consideration of the application.
As part of the approval procedure the Water Corporation, or other responsible Sewerage
Service Provider, must agree to the diversion of greywater from the sewer system, in
regard to possible negative impacts on the sewerage system. Local governments shall only
issue approval for the use of greywater systems in sewered locations where the sewerage
service provider has indicated no objections.
All plumbing work must be undertaken by a licensed plumber who must also obtain
approval from the Sewerage Service Provider for any required connection or modification
to the plumbing works connected to the sewer system.
9.2 Installing a System
Only greywater system designs approved by the Executive Director, Public Health are
permitted and it is an offence to commence construction of a greywater system without
an approval. Once the local government issues an approval the system can be
constructed, but not used.
Before a system can be used, the local government must inspect the system to ensure
that it is installed correctly before excavations are refilled. If satisfactory, the local
government will issue an approval for the system to be used. It is an offence to commence
using the system prior to receiving the local government’s approval.
9.3 Greywater Systems Approved for Use
The following greywater reuse systems are approved for general use by the Executive
Director, Public Health.
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Systems which utilise a sedimentation tank and sub soil trench irrigation systems
constructed as prescribed in Section 4.2 and Appendix 3 and sized as detailed in
Section 7.2;
Systems which convert disused septic tank systems to greywater reuse systems as
detailed in Appendix 2 and 3; and
DRAFT
Draft Guidelines for the Reuse of Greywater in Western Australia
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