Redfern Water Hardness & Quality Report (2026)

Sydney Water supplies Greater Sydney, including Redfern, drawing primarily from Warragamba Dam on the Wollondilly River. Additional water comes from Prospect, Tallowa (Shoalhaven), and Blue Mountains reservoirs. Major treatment facilities like Prospect Water Filtration Plant, North Richmond, and Woronora process this water for the region's residents. The vast catchment area, covering 21,000 square kilometers of bushland, feeds into the Warragamba Dam watershed, forming the backbone of the metropolitan supply.

The region's geology is characterized by Triassic sedimentary rocks belonging to the Sydney Basin, most notably the Hawkesbury Sandstone formation, along with layers of shale and claystone. These rock types are largely composed of quartz, which is resistant to chemical breakdown. Because there are few limestone or dolomite deposits, the water that flows through the catchment picks up very few dissolved minerals, particularly calcium and magnesium, resulting in a naturally soft water supply with low overall mineral content.

Because the water is naturally soft, homeowners in Redfern won't find scale buildup in their pipes, kettles, or appliances, which can help them last longer. You'll also notice that soaps and laundry detergents lather up more easily, meaning you can use less product. Some people find their skin and hair feel softer after showering with this type of water. Sydney Water monitors the water closely, adjusting the pH to between 7 and 8 and ensuring it meets strict guidelines for lead and copper. They also address any temporary issues with turbidity or color, and add fluoride for dental health.