Recycled water network
Recycled water is wastewater that's been collected and treated so it can be re-used.
We own and operate 14 water recycling plants. Another two plants are operated by other companies on our behalf. Our Gerringong-Gerroa plant is operated by Veolia. The St Marys Advanced Water Treatment Plant is operated by Deerubbin Water Futures.
Our water recycling plants treat wastewater:
This ensures recycled water is safe and suitable for its intended use.
Recycled water can be used to:
- water gardens, golf courses and parks
- flush toilets
- wash cars
- fight fires.
It can also be used for some industrial purposes and to supplement river flow in the Hawkesbury-Nepean River. This saves water stored in dams for drinking and keeps the river healthy.
Read about our projects that help recycle water using sewer mining and stormwater harvesting.
- Passing through a mechanical strainer
- Ultrafiltration to remove particles of organic matter that may still be present
- Reverse osmosis – very fine sieves that extract water
- De-carbonators that reduce carbon dioxide in the water.
|Treatment plant||Treatment level||Discharge
|Bombo||Secondary and de-nitrification and disinfection||3.6||
|Castle Hill||Tertiary (includes additional Phosphorus removal and disinfection)||6.5||
|Gerringong-Gerroa||Partial tertiary (includes screening, storm tank or primary sedimentation, ponding and chlorination)||0.7||
|Glenfield||Partial tertiary (includes screening, storm tank or primary sedimentation, ponding and chlorination)||0||
|Liverpool||Secondary (includes screening, de-gritting, primary sedimentation, ponding and chlorination)||0||
|Picton||Tertiary (includes additional Phosphorus removal and disinfection)||1.5||
|Penrith||Tertiary (includes additional Phosphorus and Nitrogen removal and disinfection)||22.4||
|Quakers Hill||Tertiary (includes additional Phosphorus and Nitrogen removal and disinfection)||31.1||
|Richmond||Tertiary (includes additional Phosphorus removal and disinfection)||2.2||
|Rouse Hill||Tertiary (includes additional Phosphorus and Nitrogen removal and disinfection) also includes ultra-violet irradiation and super-chlorination for reuse water||15.3||
|St Marys||Tertiary (includes ultrafiltration, reverse osmosis, de-carbonation, additional Phosphorous and Nitrogen removal and disinfection)||33.5||
|West Camden||Tertiary (includes additional Phosphorus removal and disinfection)||10.7||
|Wollongong||Tertiary and disinfection||40||
We do routine checks on the quality of our recycled water.
Our customers may use recycled water for:
- industrial purposes
- approved uses in some residential areas, eg Rouse Hill residential scheme.
We check that the water:
- is treated to the right level based on how customers will use it
- meets the standards in the Australian Guidelines for Water Recycling.
If you live in an area that has recycled water or work for a company that uses recycled water, read more about using recycled water.
We use water from St Marys Advanced Water Treatment Plant to supplement flow in the Hawkesbury-Nepean River. Find out about the water quality in our Advanced Water Treatment Plant EPA pollution monitoring data reports.