Surry Hills Water Hardness & Quality Report (2026)

The water for Surry Hills, a suburb of Sydney, New South Wales, comes from Sydney Water. This supply originates from a group of reservoirs including Warragamba Dam, Woronora Dam, Nepean Dam, Avon Dam, and Cordeaux Dam. These dams collect water from vast catchment areas in the Blue Mountains and Southern Highlands. Before reaching residents, the water undergoes treatment at several filtration plants, with the Prospect Water Filtration Plant being a major facility serving much of Sydney. The water then travels through a large network of pipes to Surry Hills, located within the City of Sydney local government area.

The Greater Sydney catchment is a large region, about 16,000 square kilometers, characterized by plateaus and valleys. The dominant geology consists of the Triassic-aged Hawkesbury Sandstone and the underlying Narrabeen Group, which includes sandstones, shales, and claystones. These rocks are rich in quartz and break down slowly, releasing very few minerals into the water. This geological makeup is the primary reason for the naturally soft water quality. While there are some basalt flows and dolerite intrusions, they don't add significant hardness. The soil also contains organic matter, which slightly affects the water's acidity, but this is adjusted during the treatment process.

Because the water is soft, homeowners in Surry Hills will notice less scale buildup inside appliances like kettles, washing machines, and dishwashers. This generally means your appliances may last longer and require less frequent descaling. You'll also find that soaps and detergents lather up more easily, which can make laundry feel more effective and be gentler on your skin. A water softener isn't necessary for this supply. Instead, regular cleaning of appliance filters is a good maintenance practice. Hot water systems won't be as prone to mineral deposits, potentially leading to lower energy bills and fewer service calls. Sydney Water aims to keep the water's pH within a range of 6.5 to 8.5, and the supply consistently meets Australian Drinking Water Guidelines for all tested parameters, including lead and copper.