Turramurra Water Hardness & Quality Report (2026)

Sydney Water supplies treated drinking water to Turramurra, NSW (postcodes 2074 North and South), serving over 5 million people across Greater Sydney including the Hornsby Shire where Turramurra is located. The primary sources are surface water reservoirs such as Warragamba Dam (largest, on Warragamba River), Prospect Reservoir, Woronora Dam, and smaller catchments like Avon and Nepean Rivers. Water is treated at major plants including Prospect Water Filtration Plant, North Richmond, and Woronora, using processes like coagulation, filtration, disinfection, and fluoridation before distribution through extensive pipelines. The Greater Sydney Water Supply System draws from the 16,000 km² Sydney Catchment, encompassing protected bushland in the Blue Mountains and Metropolitan areas.

Key geological features include the Triassic-age Sydney Basin sandstones (Hawkesbury and Newport Formations), which dominate the watershed and limit mineral dissolution. No major aquifers are tapped; instead, runoff from granitic and sedimentary rocks produces a soft supply with low dissolved solids, shaped by the siliceous geology that resists chemical weathering and keeps cation levels minimal. The underlying geology features Triassic Hawkesbury Sandstone and Narrabeen Group shales, which contribute low levels of dissolved calcium and magnesium due to their quartz-rich, siliceous nature with limited carbonate content.

As soft water, Turramurra's supply causes no limescale buildup on fixtures, kettles, or pipes, extending appliance life without scaling issues. Plumbing, water heaters, and washing machines face minimal mineral deposits, and soap lathers easily with no drying effects on skin or hair. No water softener is needed or recommended; routine descaling is unnecessary, though occasional cleaning prevents any soap scum. Water quality is excellent with a WaterScore of 8.9/10 per 2026 reports. pH is 7.8 (within ADWG 6.5–8.5), TDS 137 mg/L (low vs. 600 mg/L guideline), turbidity 0.13 NTU (clear vs. 5 NTU), and fluoride 1.01 mg/L for dental health. E. coli detected in some samples fails the zero-tolerance standard, but overall compliance is high.