Maddington Water Hardness & Quality Report (2026)

Water Corporation supplies Maddington, located within the City of Gosnells, with a mix of surface and groundwater. This supply originates from reservoirs like Mundaring Weir on the Helena River and Wellington Dam, alongside groundwater drawn from the Perth Coastal Plain aquifers, specifically the Gnangara and Jandakot schemes. Treatment takes place at major facilities such as the Kwinana or Harrisdale plants before distribution to over two million residents across the Swan Coastal Plain region.

The water's journey begins within the Perth Basin, interacting with its sedimentary geology. This includes Quaternary sandplains, the Tamala Limestone (a Pleistocene-era calcareous aeolianite), and underlying Pinjarra Plain clays. These limestone-dominated aquifers and calcium-rich catchment soils mean the water picks up alkaline earth metals as it flows underground, resulting in a moderately mineralised character without being overly corrosive.

This moderately hard water can lead to some scale buildup in appliances like kettles and dishwashers, which can reduce their efficiency over time. Homeowners might notice increased energy consumption or potential repair needs for heating elements and boilers. To manage this, regular descaling with vinegar, installing scale filters, and annual hot water heater flushing are helpful. For those concerned about appliance longevity or the aesthetic impact of scale, a water softener is a worthwhile consideration. The water's pH typically sits between 7.5 and 8.5, and Water Corporation ensures compliance with Australian Drinking Water Guidelines for substances like lead and copper, with no significant PFAS concerns reported.