Nedlands Water Hardness & Quality Report (2026)

Nedlands' drinking water is supplied by the Water Corporation via the Integrated Water Supply Scheme (IWSS), incorporating Gnangara Mound groundwater and Kwinana and Binningup Seawater Desalination Plant contributions for the City of Nedlands LGA inner Perth distribution in Western Australia. Water hardness in Nedlands 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. Nedlands — a prestigious inner Perth suburb in the City of Nedlands LGA, home to the University of Western Australia on the banks of the Swan River, the Royal Perth Yacht Club at Crawley Bay, the Sir Charles Gairdner Hospital at QEII Medical Centre, and the leafy boulevards and Californian Bungalow residential streetscapes of this highly sought-after inner Perth riverside community — receives moderately hard supply consistent with other inner Perth IWSS sub-zones (East Perth 174 mg/L, Mount Lawley 177.5 mg/L).

Nedlands' moderately hard supply reflects a moderate Gnangara Mound groundwater fraction in the inner Perth City of Nedlands IWSS distribution. The Gnangara Mound groundwater percolates through the Superficial Aquifer and Tamala Limestone — the porous Eocene carbonate formation of the Swan Coastal Plain — accumulating dissolved calcium, magnesium, and sulphates. At 172 mg/L and TDS 445.1 mg/L, Nedlands is consistent with the moderately hard inner Perth IWSS distribution character (East Perth 174 mg/L, Wembley 117.5 mg/L), reflecting the moderate Gnangara Mound groundwater proportion at the inner riverside Perth distribution sub-zone.

Nedlands 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. Solar hot water systems in WA's climate benefit from periodic servicing. Under WA water restrictions, garden irrigation is limited to two days per week. The low lead reading (0.003 mg/L) is good. The Water Corporation provides water quality information at watercorporation.com.au, with all ADWG health standards met. Nedlands' University of Western Australia campus and the Swan River riverside community benefit from supply meeting all ADWG standards.