Revesby Water Hardness & Quality Report (2026)

Sydney Water Corporation provides Revesby's water supply, drawing from a vast network of 29 dams across the Greater Sydney, Blue Mountains, and Illawarra regions. Key reservoirs include Warragamba Dam, Woronora Dam, Nepean Dam, Avon Dam, and Cordeaux Dam. Water undergoes rigorous treatment at major facilities like the Prospect Water Filtration Plant, the North Richmond facility, and the Woronora treatment plant. These processes involve conventional filtration, chlorination, fluoridation, and pH adjustment before distribution to residents via an extensive pipeline system.

The geology underpinning the Greater Sydney catchment is primarily composed of Triassic-age Hawkesbury Sandstone and Narrabeen Group shales. These formations, along with minor dolerite intrusions and Quaternary alluvium, contribute to a naturally soft water profile. Unlike supplies drawn from limestone or dolomite, this sandstone-dominated watershed allows rainwater to percolate quickly through relatively inert sands, minimizing the dissolution of calcium and magnesium-bearing minerals. The result is water with low mineral content and a soft character that persists through the treatment process.

As a result of its soft water characteristics, Revesby's supply causes minimal limescale buildup on household fixtures, kettles, and hot water systems, helping to maintain appliance efficiency without the need for frequent descaling. You'll find that soap and shampoo lather easily, which can feel beneficial for skin and hair. A water softener isn't typically recommended for this type of supply; instead, homeowners can focus on basic maintenance like occasional vinegar rinses for any minor deposits and ensuring tap aerators remain clean to preserve water flow. The water quality is excellent, with a pH of 7.9 and low total dissolved solids.