Wastewater that's been used in homes and businesses can be recycled and used for many different purposes. We put it through a multi-step treatment process to remove impurities and treat it appropriately for its intended purpose. Similarly, plumbers must consider the end purpose and the level of treatment the water is receiving when they design plumbing systems.
We supply recycled water to homes and businesses through purple pipes. These pipes supply water for flushing toilets, washing clothes and outdoor uses such as watering gardens in homes and businesses.
Recycled water isn't intended for drinking, so it's not treated to drinking water standards. This means the plumbing must be kept separate from the drinking water pipes and clearly identified as recycled water. Read more about how we’re producing recycled water and what it can be used for.
The NSW Government also encourages the private sector to implement innovative water recycling solutions through sewer mining and stormwater harvesting. Read more about these below.
Because our water resource recovery facilities treat recycled water according to how it will be used, recycled water plumbing requires particular care. There must be no cross-connection between water treated to lower levels and water treated for drinking or personal use.
NSW Health advises on and regulates the health aspects of recycled water use and quality. NSW Fair Trading regulates and inspects recycled water plumbing.
Only licensed plumbers can do plumbing and drainage work. This is particularly important for recycled water and greywater systems. We must ensure that non-drinking water is kept separate and clearly identified.
Plumbers must follow the current version of the Plumbing Code of Australia and Australian Standard AS/NZ 3500. All pipes and products must comply with current Australian standards.
Visit NSW Fair Trading for the latest requirements.
NSW Fair Trading regulates and inspects recycled water plumbing to make sure it complies with the Plumbing Code of Australia and NSW Health guidelines.
Alterations, extensions and new recycled water plumbing must all be inspected. To book an inspection:
On building sites, recycled water may be used for:
If recycled water is supplied to your building site, it's probably not treated to drinking standard. You should ensure your workers understand what the water is and is not suitable for, and there are appropriate warning signs.
The NSW Government encourages private organisations to implement innovative recycled water solutions to secure Sydney’s water supply, particularly through sewer mining.
Sewer mining is extracting wastewater from a local wastewater system and treating it on-site using a small treatment plant. Recycled water produced from sewer mining is used:
Find out more about sewer mining and other ways we're producing recycled water.
Applying to set up a sewer mining scheme is a detailed process, requiring approvals from Sydney Water, your local council, and in some cases, the NSW Office of Environment and Heritage (OEH). You may also need to consult with IPART, and apply for a licence under the Water Industry Competition Act 2006 (WICA).
Completing a thorough investigation and concept review before making a formal application ensures you will have all the necessary information for us to properly assess your application. Learn more about how to apply:
Stormwater is another source of recycled water. We work with local councils and other agencies to manage Sydney’s stormwater. Most stormwater harvesting schemes are locally operated. We don’t usually have a role in establishing or operating small local schemes. However, we'll help arrange access to the stormwater supply from our stormwater system. We also investigate opportunities to collect and reuse stormwater.
Stormwater harvesting involves:
Recycled water produced from stormwater harvesting is commonly used to water:
Stormwater harvesting systems can be large or small. They usually consist of:
Recycled water produced from stormwater must be treated according to public health and environmental standards and requirements. The NSW Government has guidelines for Managing Urban Stormwater: Harvesting and reuse (2006).
These NSW Government guidelines provide an overview of stormwater harvesting and its potential benefits and limitations. They also provide information about planning and designing stormwater harvesting schemes to meet statutory and regulatory requirements.