Advancing public and environmental health in Sydney’s south-western suburbs

Sydney’s south-western suburbs are home to a rapidly growing population and some of the city’s most popular beaches. Applying our expertise in boosting operational efficiency is helping meet the region’s evolving wastewater treatment needs.
The mission

Turning on the tap for remote communities

The Cronulla Wastewater Treatment Plant delivers essential treatment services for around 210,000 people living in the communities of the Cronulla-Sutherland Peninsula, including Sylvania, Como, Menai and Heathcote.

In January 1999, SUEZ (then operating as Australian Water Services) and Bovis Lend Lease partnered in a $90 million design, build and operate contract to upgrade the plant’s water treatment process on behalf of Sydney Water, helping them to better serve the community’s needs.
Our answer

Optimising operations and maintenance

With ambitious targets in sight, SUEZ’s extensive expertise in operational performance enhancement has transformed the plant’s capacity to meet growing wastewater treatment requirements.

Advancing capabilities

Key to the contract was the amplification and upgrade of the treatment process from primary treatment to tertiary treatment. SUEZ assumed full operations of the plant for a three-year period one year prior to commissioning, working to ensure peak efficiency across the full operations and maintenance functions of the plant. 

100 per cent compliance

We successfully and efficiently transitioned management of the plant to Sydney Water in April 2003, with 100 per cent compliance on all contractual obligations including process performance, verification of operating costs and training of the future operations team.
The results
Following successful transition, the Cronulla Wastewater Treatment Plant now has capacity to treat more than 52 megalitres of wastewater per day to meet the sanitation needs of the mounting population. In addition, three megalitres of treated effluent is made available for use as recycled water each day.

The plant is providing far-reaching environmental and health benefits to the local area, delivering improvements in water quality at Cronulla's beaches and throughout Bate Bay.



wastewater treatment capacity in dry weather



treated effluent for use as recycled water


residents provided with wastewater treatment services