Pymble Water Hardness & Quality Report (2026)

Sydney Water Corporation supplies the greater Sydney area, including Pymble on the North Shore. Residents in Pymble receive treated drinking water primarily from the Prospect Water Filtration Plant. This plant sources raw water from Warragamba Dam, situated on the Nepean-Hawkesbury River system, and also draws from upper catchment reservoirs like Avon, Wingecarribee, Woronora, and Cataract. These surface water sources are transported through aqueducts and pipelines to various treatment facilities. The Warragamba catchment alone covers 21,000 square kilometres within the Sydney Basin.

The Sydney Basin geology, particularly the Triassic age Hawkesbury Sandstone and underlying Narrabeen Group shales, characterises the water's mineral content. These rock formations are rich in quartz and contain very little carbonate material. Consequently, rainwater percolating through these siliceous and inert strata picks up minimal dissolved calcium and magnesium. This geological makeup, lacking extensive limestone or dolomite, is the reason Sydney's water is naturally very soft, with low overall mineralisation.

Because the water is so soft, you'll find it doesn't leave much scale buildup in appliances such as kettles, dishwashers, and hot water systems. This means less frequent descaling and potentially a longer lifespan for these items. Soap will lather up easily, and you won't typically see spotting on glassware or bathroom fixtures. Installing a water softener isn't necessary and isn't recommended, as it could add unnecessary sodium to a supply that's already low in minerals. Sydney Water also maintains the water's pH around 7.5-8.5 to prevent corrosion in pipes.