Water sources

Meeting the community’s future water and wastewater needs

Featuring all water sources and water security projects this 2 minute film explains Westernport Water’s holistic approach to water management.

Candowie Reservoir

Candowie catchment is a sub catchment of the Bass Catchment. It is approximately 1,900 hectares with an estimated 25km of waterline. An open catchment which is privately owned and Westernport Water does not have direct control or management over the land servicing the reservoir. Tennent Creek is the main tributary through the catchment that feeds Candowie and a minor tributary the Tozar Creek which enters the Tennent Creek prior to entering the reservoir.

The Candowie Reservoir was first commissioned in 1964 with a capacity of 1130ML, it was then raised 1.68 meters in 1978 to a capacity of 1737 ML, and raised a further 0.80 meters in 1982 to a capacity of 2264 ML, additionally in 2013 the reservoir full supply level was raised a further 3 meters, doubling the storage capacity to 4464 ML.

Interested in history? In this article we explore a water supply evolution – Water Supply Retrospective History Article (190 KB)


The Corinella aquifer, a system of bores, was identified as an alternative water supply during the 2006 drought. The aquifer was under-utilised with a small number of farm bores using only 300 megalitres (ML) of a borefield with a yield of 2400ML. Westernport Water has constructed three production bores and a new supply pipeline that will be used to augment surface water to Candowie Reservoir. Several pumping tests of the underground water reserves have been conducted to ensure that Westernport Water does not interfere with other users, or adversely affect the bores and the surrounding environment.

Bass River

Sourcing water from the Bass River to augment the water supply at Candowie Reservoir has been a long-term project. Westernport Water completed extensive environmental studies and flow studies on the Bass River to assist in determining excess flows in the river above environmental needs, and the needs of irrigators and farms on the river. A bulk entitlement for the Bass River was issued by the Minister for Water to Westernport Water in August 2009. This allows Westernport Water to pump water at a rate up to 25ML per day from the Bass River (if required) provided that an environmental flow exceeding 40ML remains in the river at all times. Read more about bulk entitlements by downloading this bulk entitlement information document pdf (44 KB).

Desalination and Melbourne pool water

As a further security measure and protection from climate variability Westernport Water has secured a 1000ML Bulk Entitlement from the Metropolitan pool supply system, by establishing a connection to the pipeline that transfers water between Cardinia Reservoir and the Victorian Desalination Plant, providing us with access to the water all year round thanks to the two way pipeline which may include desalinated water.