Wastewater, also known as sewage, is the used water that goes down sinks, toilets and drains. We treat it so it's safe to recycle and reuse, and we recover valuable by-products. Then we return safe, treated wastewater to the environment.
When wastewater leaves the pipes on your property, it connects with one of ourthroughout Sydney, the Illawarra and the Blue Mountains. Our systems provide wastewater services to more than 5.2 million people.
Our wastewater systems consist of:
Water resource recovery facilities give new life to wastewater through recycling, reusing by-products or generating some of the energy the facilities need to do their job. We're committed to reducing the environmental impact of what we do to help mitigate climate change.
We're building new facilities as our population grows. Get project updates at
Some non-residential customers produce their own recycled water through sewer mining. They extract wastewater from their local wastewater system and treat it on-site using a small treatment plant. They can use the recycled water in various ways:
Find out more about sewer mining and other ways we're producing recycled water.
Wastewater from homes and businesses contains nutrients, organic matter, bacteria, and cleaning products like shampoo and detergents. Commercial and industrial customers produce trade waste. If wastewater was discharged without being treated, it would harm the environment.
You can learn more about the safety of Greater Sydney's harbour and ocean beaches from the NSW Government RiverWatch® is our recreational monitoring and reporting program for rivers, creeks, lakes and harbour inlets. It monitors water quality at Urban Plunge® swim sites.
The Northside Storage Tunnel stores excess wastewater and stormwater that may overflow into Sydney Harbour. By preventing untreated overflows, we can help protect public health, recreational activity and aquatic ecosystems in the catchment.