Westmead Water Hardness & Quality Report (2026)

Residents of Westmead, postcode 2145, in the City of Parramatta local government area, receive their water supply from Sydney Water. The water originates from a vast network of 11 dams, with Warragamba and Prospect Reservoir being the most significant sources. Additional water comes from the Nepean, Avon, and Wingecarribee catchments. Primary treatment is carried out at the Prospect Water Filtration Plant, which serves a massive population of 5.4 million across Sydney's 13 supply zones. Westmead is part of the Ryde zone, and Sydney Water oversees the distribution of this water through an extensive system of 22,000 km of mains.

The Greater Sydney catchment area, covering 16,000 km², is primarily composed of Triassic Hawkesbury Sandstone and Narrabeen Group shales, with occasional basalt intrusions. This region lacks significant carbonate aquifers. The water's journey begins as surface runoff from watersheds dominated by sandstone, which naturally imparts a low mineral content. Dissolution of minerals like magnesium and calcium is limited by this siliceous geology, contributing to the water's characteristically soft profile. The large volume of water stored in the reservoirs further aids in diluting any leached minerals, resulting in a naturally low-mineralised water supply.

Because the water is soft, you'll find less limescale buildup in household appliances. This means your kettles, washing machines, and hot water systems are less likely to suffer from scaling, potentially extending their lifespan and reducing maintenance. Soap lathers more easily, and you might notice less soap scum residue on your skin and hair, meaning you probably won't need a water softening system. If any trace mineral deposits do accumulate, simply cleaning aerators or showerheads occasionally should suffice. Sydney Water maintains the water's pH between 6.5 and 8.5, adhering to Australian guidelines, and consistently meets standards for lead, copper, PFAS, and microbial contaminants, with low levels of trihalomethanes detected after chlorination.