Cremorne Water Hardness & Quality Report (2026)

Sydney Water supplies Cremorne, a suburb within the North Sydney Council area, drawing water from a vast network managed by Sydney Water. The primary source is Warragamba Dam, part of the Hawkesbury-Nepean River system. This supply is augmented by other major reservoirs like Woronora Dam, Cordeaux Dam, Avon Dam, Lake Cataract, and the Upper Nepean dams. Water undergoes treatment at facilities including the Prospect Water Filtration Plant and North Richmond, serving millions across Greater Sydney. The extensive catchment area is carefully managed within Sydney Water's Special Areas to safeguard water quality.

The geology beneath Sydney consists of Triassic sedimentary rocks belonging to the Sydney Basin. These are dominated by the quartz-rich Hawkesbury Sandstone, interspersed with layers of shale from the Narrabeen Group. Because these rocks contain very few calcium or magnesium-rich minerals like limestone, they don't easily dissolve into the water. Consequently, the water flowing through these formations picks up minimal dissolved solids, resulting in a naturally soft water supply for the region.

Because the water is soft, homeowners in Cremorne will likely notice less limescale buildup in appliances like kettles, dishwashers, and hot water systems. This means less frequent descaling and potentially longer appliance lifespans. You’ll also find that soap and detergents lather more easily, which can be beneficial for both cleaning and personal hygiene. Sydney Water aims to maintain a pH range of 6.5 to 8.5, and implements corrosion control measures to protect the distribution system and plumbing. There have been no reported issues with PFAS contamination exceeding guidelines.