17 June 2016

Wastewater systems

Onsite disposal of wastewater is required in areas where reticulated sewerage is unavailable.

Every onsite wastewater system requires an approval.

Which system to install?

In most cases conventional septic tank leach drain systems will be adequate. 

Your local government may require systems that can produce treated wastewater with a high quality, such as: aerobic treatment unit (ATU) and alternative treatment systems (ATS). Where nutrient retention is required, the local government should be consulted to determine if the system's nutrient removal capacity will meet their requirements.

There are other approved non-conventional systems that can be used to treat and dispose of wastewater onsite, such as:

  • composting toilets
  • incinerating toilets
  • greywater systems.

Building construction sites are required to have approved temporary toilets if there is no access to toilet facilities onsite.

Understanding Septic Tank Systems

Most unsewered developments in Western Australia use septic tank systems (PDF 453KB) to treat and dispose of sewage.  

More information

  • Water Unit, Environmental Health Directorate
    Department of Health
    Telephone: 9388 4999
    Email: ehinfo@health.wa.gov.au
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