Eastwood Water Hardness & Quality Report (2026)

Sydney Water Corporation provides treated drinking water to Eastwood, NSW, reaching over 5 million people throughout Greater Sydney. The supply originates from a series of large reservoirs, including Warragamba Dam, Woronora Dam, Nepean Dam, Avon Dam, and Cordeaux Dam. Water undergoes primary treatment at significant facilities such as the Prospect Water Filtration Plant before being distributed via an extensive network of pipes. Eastwood's water does not involve local groundwater sources or private treatment systems.

The Greater Sydney catchment covers about 16,000 square kilometers of protected national parkland, with the Hawkesbury-Nepean River system serving as the main watershed. The geology is dominated by Triassic sandstone and shale formations. These rock types weather slowly, leading to naturally soft water with very little mineral content. This geological makeup means the water supply has low dissolved solids and doesn't pick up significant hardness minerals from limestone or dolomite.

Because the water is soft, Eastwood residents experience very little limescale buildup, which is beneficial for appliances like kettles, washing machines, and dishwashers. You'll find it gentle on your skin and hair, and soap lathers easily, meaning you don't need to use much detergent. No special maintenance for fixtures is usually required, and a water softener isn't recommended due to the naturally low mineral levels. While the water quality is generally excellent, with a pH of 7.9 and low turbidity, E. coli was detected at 1 org/100 mL in some samples, which is above the ADWG requirement of zero.