Nollamara Water Hardness & Quality Report (2026)

Water Corporation supplies Nollamara, a suburb within the City of Stirling in Western Australia. The utility draws from a mixed water supply system. This includes groundwater from the Gnangara Mound and Jandakot aquifers, surface water sourced from Darling Range dams like Mundaring Weir, and desalinated seawater from the Perth Seawater Desalination Plant and Southern Seawater Desalination Plant. Water destined for Nollamara and other northern Perth areas is treated at facilities such as the Wanneroo Groundwater Treatment Plant. Regional blending ensures a consistent supply across metropolitan Perth.

The water supply for Nollamara primarily originates from the Gnangara Mound. This shallow, unconfined aquifer resides within the Perth Basin, characterized by sedimentary layers of limestone, sandstone, and calcarenite. These karstic limestone formations, dating back to the Pleistocene epoch and overlying Cretaceous sediments, naturally leach minerals like calcium and magnesium from percolating rainwater. This geological process is the main reason for the characteristically hard water found in this northern region. While softer runoff from Darling Range catchments and very soft desalinated water are blended in, the groundwater's mineral content from the limestone dominates.

Homeowners in Nollamara may notice scale buildup in appliances like kettles, dishwashers, and hot water systems, which can reduce their efficiency and lifespan. Showers might feel less foamy, requiring more soap, and white deposits can appear on fixtures. To combat these effects, regular descaling with vinegar, installing scale filters on taps, and annual flushing of hot water heaters are recommended. Given the potential for significant limescale issues, particularly in the northern parts of Perth, a whole-house water softener is often a worthwhile investment for protecting appliances. Water Corporation confirms its water meets the Australian Drinking Water Guidelines, with typical pH levels between 7.0–8.5 and no reported exceedances for lead or copper at the tap. While treatment includes chlorination and fluoridation, occasional chlorine notes in taste or odour are possible.