Trade waste

Consumer responsibility

Liquid waste needs to be pre-treated before it can enter the TasWater sewerage infrastructure.

Putting in a pre-treatment system requires council and TasWater approval. It is recommended that before you choose a designer, you check with the relevant council to ensure that the pre-treatment design credentials align with the council and TasWater needs.

You will need to submit your pre-treatment system designs to TasWater for consideration and the design must be done by a qualified and experienced designer.

The design will depend on the:

  • type of trade waste that needs to be treated and
  • size of the receiving sewer catchment.

Your designer will need to make sure the pre-treatment device is big enough for the maximum amount of discharge. TasWater publishes a Guideline document to assist in sizing trade waste appliances and it is available on their website at www.taswater.com.au

Technical information

The Plumbing Code of Australia (PCA) contains the technical requirements for the design, construction, installation, replacement, repair, alteration and maintenance of liquid trade waste systems.

In Tasmania the Department of Justice legislates the technical standard detailed in the PCA. The Tasmanian Water and Sewerage Corporation (TasWater) (external link) approve the size and capacity needed for pre-treatment and must comply with the technical standards detailed in the PCA.

The National Construction Code 2019, Volume 3, Plumbing Code of Australia (PCA), contains the performance requirements specified under Part F.

Backflow of contaminated water

TasWater is responsible for making sure that public drinking water is safe. One aspect of that process is to look at the different hazards of each property connected to the potable water supply system and ensure there are barriers to control those hazards. Consult with TasWater on backflow protection devices located at the boundary of commercial and industrial businesses.

Backflow is the unwanted reverse of water within the water lines or water main. Prevention is crucial because backflow events overseas and in Australia have caused poisoning and death.

For commercial and industrial businesses that are connected to TasWater infrastructure, a boundary backflow containment device is always required. A boundary backflow containment protection is placed at the properties boundary.

General advice

Trade waste customers receive a hazard risk rating for their premises and enter into a Trade Waste Agreement with TasWater. The discharge of trade waste to TasWater sewerage infrastructure will then be assessed and fees charged accordingly.

Visit TasWater (external link) and learn more about trade waste policies, guidelines and forms.

Search for a licensed plumber

Search now to find a plumber licensed to operate in Tasmania

Find your local council

Visit the Local Government Association of Tasmania website (external link) to find your local council

Updated: 28 Jul 2022

This page has been produced and published by the Consumer Building and Occupational Services Division of the Department of Justice. Although every care has been taken in production, no responsibility is accepted for the accuracy, completeness, or relevance to the user's purpose of the information. Those using it for whatever purpose are advised to verify it with the relevant government department, local government body or other source and to obtain any appropriate professional advice. The Crown, its officers, employees and agents do not accept liability however arising, including liability for negligence, for any loss resulting from the use of or reliance upon the information and/or reliance on its availability at any time.