Maddington Water Hardness & Quality Report (2026)

Maddington's drinking water is supplied by the Water Corporation via the Integrated Water Supply Scheme (IWSS), with a moderate Gnangara Mound groundwater proportion for the City of Gosnells LGA outer south-eastern Perth distribution in Western Australia. Water hardness in Maddington is measured at 166 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Maddington — an outer south-eastern Perth suburb in the Gosnells LGA, known for the Maddington industrial estate, the Maddington Kenwick Sports Complex, and the residential and commercial character of the outer south-eastern Perth corridor adjacent to the Kenwick railway station — receives moderately hard supply, significantly harder than the adjacent Southern River sub-zone (120.5 mg/L) in the same Gosnells LGA, reflecting a higher groundwater proportion in the Maddington distribution.

Maddington's moderately hard supply reflects a moderate Tamala Limestone and Gnangara Mound groundwater proportion in the outer south-eastern Gosnells IWSS distribution. The proximity to the eastern Perth groundwater system and the higher groundwater fraction in the Maddington industrial and residential distribution sub-zone delivers harder supply at 166 mg/L and TDS 419.5 mg/L compared to the desalinated-dominant Southern River sub-zone (120.5 mg/L) in the same Gosnells LGA, confirming significant supply blend variation across the City of Gosnells outer south-eastern Perth distribution network.

Maddington residents face moderate limescale build-up on taps and in kettles — descaling every four to six weeks is typical. Hot water systems benefit from periodic inspection. Solar hot water systems in WA's climate need annual 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. Maddington's industrial and residential community benefits from a supply meeting all ADWG standards.