Penshurst Water Hardness & Quality Report (2026)

Penshurst's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant incorporating a significant Hawkesbury-Nepean component for the Georges River Council LGA inner southern Sydney distribution in New South Wales. Water hardness in Penshurst is measured at 167 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Penshurst — a family-oriented residential suburb in the Georges River LGA along the Illawarra rail line, known for the Penshurst Park and local sports oval, the Penshurst shopping strip on Forest Road, and the mixed residential character of this inner southern Sydney suburb adjacent to Hurstville and Beverly Hills — receives moderately hard supply consistent with the moderately hard character of the Georges River LGA inner southern Sydney distribution.

Penshurst's moderately hard supply reflects a significant Hawkesbury-Nepean component in the inner southern Georges River Prospect distribution blend. The Hawkesbury-Nepean system traverses Cumberland Plain alluvial terrain and Triassic carbonate-cemented deposits contributing moderate dissolved calcium and minerals before Prospect treatment. The Penshurst inner southern Georges River distribution at 167 mg/L and TDS 376.6 mg/L receives a proportionally higher Hawkesbury-Nepean fraction, consistent with the moderately hard southern Sydney supply corridor receiving a greater proportion of Hawkesbury-Nepean contribution than the predominantly Warragamba-supplied inner western and south-western Sydney sub-zones.

Penshurst residents can expect moderate limescale build-up on taps and in kettles — descaling every four to six weeks is typical. Hot water systems benefit from periodic 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. Penshurst's inner southern Sydney residential community and the Georges River LGA community benefit from supply meeting all ADWG standards.