Turramurra Water Hardness & Quality Report (2026)

Turramurra's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant with an elevated Hawkesbury-Nepean component for the Ku-ring-gai LGA upper north shore Sydney distribution in New South Wales. Water hardness in Turramurra is measured at 172 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Turramurra — a prestigious upper north shore Sydney suburb in the Ku-ring-gai LGA, known for the large residential lots along the Pacific Highway corridor between Gordon and Pymble, the Turramurra Community Village, the Turramurra High School and the Knox Grammar School precinct, and the leafy bushland residential character that defines this sought-after Sydney upper north shore community — receives moderately hard supply, dramatically harder than the Pymble sub-zone (90 mg/L) only a short distance south in the same Ku-ring-gai LGA, confirming extreme supply blend variation within the same LGA.

Turramurra's elevated hardness reflects a substantially higher Hawkesbury-Nepean component in the upper north shore Ku-ring-gai Prospect distribution blend at this sub-zone. The Hawkesbury-Nepean system traverses Cumberland Plain alluvial terrain and Triassic carbonate-cemented Hawkesbury Sandstone deposits contributing elevated dissolved calcium. The Turramurra Ku-ring-gai distribution at 172 mg/L and TDS 391.6 mg/L contrasts dramatically with the much softer Pymble sub-zone (90 mg/L, TDS 172.1 mg/L) in the same LGA, confirming the very different distribution main supply routing at the Turramurra upper north shore sub-zone.

Turramurra residents face moderate-to-significant limescale build-up on taps and in kettles — descaling every four to six weeks is typical. Hot water systems benefit from regular inspection. The elevated lead reading (0.004 mg/L) warrants briefly running the cold tap before use. Sydney Water provides water quality information at sydneywater.com.au, with all ADWG health standards consistently met. Turramurra's Ku-ring-gai upper north shore residential community and the Knox Grammar precinct benefit from supply meeting all ADWG safe drinking standards.