What plumbers need to know\n

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. 

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Sydney Water recycling systems\r\n

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.

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Private recycling systems

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.

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Plumbing requirements\r\n

Recycled water is fit for purpose


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.

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Plumbing codes and standards\r\n

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. 

  • Residential sites with recycled water have purple pipes, removable outdoor taps and warning signs on taps.
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  • Industrial sites can have different arrangements, including alternative colour coding or different on-site warnings.
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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. 

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  • 住宅的网站再生水有紫色的管道,可拆卸的户外水龙头和水龙头上的警告标志。
  • 工业场所可以有不同的安排,包括可选的颜色编码或不同的现场警告。

水管工必须遵循当前版本的澳大利亚管道规范和澳大利亚标准AS/NZ 3500。所有管道和产品必须符合现行的澳大利亚标准。


Plumbing inspections\r\n

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:

  • pay the inspection fees online at NSW Fair Trading
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  • call NSW Fair Trading for an appointment or for more information about plumbing and audit inspections.
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  • 在网上支付检验费用新南威尔士州公平贸易
  • 打电话给NSW公平贸易公司预约或了解更多有关管道和审计检查的信息。


Building sites\r\n

On building sites, recycled water may be used for:

  • dust suppression
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  • washing trucks and plant equipment
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  • watering gardens
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  • flushing toilets
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  • filling ornamental ponds.
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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.

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  • 除尘措施
  • 清洗卡车和工厂设备
  • 浇花园
  • 冲洗厕所
  • 填充装饰性池塘。




Sewer mining\r\n

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:

  • to flush toilets in commercial buildings and at industrial sites
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  • in cooling towers
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  • to irrigate sports fields, parks and golf courses.
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Find out more about sewer mining and other ways we're producing recycled water.

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  • 在商业楼宇及工业地盘冲厕所
  • 在冷却塔中
  • 灌溉运动场、公园及高尔夫球场。


Setting up a sewer mining scheme\r\n

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:

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Stormwater harvesting\r\n

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:

  • collecting stormwater from urban areas such as stormwater drains or creeks (not from roofs)
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  • storing the stormwater
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  • treating the stormwater so it can be reused as recycled water.
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  • 收集市区雨水,例如雨水渠或水溪(不是屋顶)
  • 储存雨水
  • 对雨水进行处理,使其可以作为循环水重复使用。


Recycled water produced from stormwater harvesting is commonly used to water:

  • public parks
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  • gardens
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  • sports fields
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  • golf courses.
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Stormwater harvesting systems can be large or small. They usually consist of: 

  • an extraction point where stormwater is captured or diverted from a drain, creek or pond 
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  • a network of pipes to transport stormwater from the connection point to the storage site 
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  • a dam or storage tank where stormwater is temporarily collected for treatment and use 
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  • a treatment system producing recycled water that is suitable and safe for its permitted use 
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  • a network of pipes for distributing recycled water 
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  • a system to manage by-products produced in the stormwater harvesting facility. 
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Guidelines and requirements 


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. 


Learn more

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  • 公园
  • 花园
  • 体育领域
  • 高尔夫球场。


  • 从排水沟、小溪或池塘中收集或转移雨水的抽取点
  • 将雨水从连接点输送到储存地点的管道网络
  • 蓄水池:暂时收集雨水以供处理和使用的水坝或蓄水池
  • 一种能产生适合及安全的循环用水的处理系统
  • 分配再循环水的管道网络
  • 管理雨水收集设施产生的副产物的系统。