Hurstville Water Hardness & Quality Report (2026)

Sydney Water provides treated drinking water to Hurstville, New South Wales, and the surrounding Georges River Council area, serving more than 5 million people across Greater Sydney. The water originates from a vast network of dams including Warragamba Dam, Woronora Dam, Nepean Dam, Avon Dam, and Cordeaux Dam. Most of the supply, about 90%, is treated at the Prospect Water Filtration Plant, with other facilities like North Richmond also playing a role. Treatment processes involve coagulation, filtration, disinfection, and fluoridation before the water is distributed via an extensive pipeline system. The entire supply is drawn from the Greater Sydney catchment, a protected area of 16,000 square kilometers.

The geological landscape is dominated by Triassic-era sandstone formations, particularly the Hawkesbury Sandstone, with underlying layers of Narrabeen Group shales and sandstones, and some Wianamatta Shale. These sedimentary rocks are rich in quartz and contain minimal limestone. Consequently, they leach very low levels of minerals like calcium and magnesium into the water. This low mineral content, combined with the protected nature of the catchments, results in water that is naturally soft.

Because the water is soft, residents in Hurstville won't experience limescale buildup in appliances like kettles, washing machines, dishwashers, or hot water systems, protecting them from reduced efficiency and potential damage. You'll also find that soap lathers easily, and there's no issue with soap scum. A water softener isn't necessary, and routine descaling is also unnecessary, though an occasional wipe with vinegar can address any minor deposits from airborne minerals. The water's pH is 7.8, and its low total dissolved solids level of 137 mg/L is well within guidelines.