Mildura Water Hardness & Quality Report (2026)

Lower Murray Water draws its supply from the Murray River, Australia's longest waterway, which flows through the expansive Murray-Darling Basin. Water is abstracted from the Mildura Weir Pool and treated at the Mildura Treatment Plant before distribution to roughly 50,000 residents across the Sunraysia region. While the Murray River forms the primary source, Lower Murray Water sometimes supplements this with groundwater from shallow bores within the Murray Group aquifer, particularly when river flows are low. The Mildura intake is significantly influenced by upstream catchments located in both New South Wales and Victoria.

The geology surrounding Mildura is characterized by ancient sedimentary formations from the Cretaceous and Tertiary periods, specifically the Murray Basin's Calivil Formation and Blanchetown Clay. These layers, along with Quaternary river sediments, contain limestone and dolomite. As the Murray River flows through these mineral-rich catchments and irrigated farmlands, it dissolves calcium and magnesium ions, contributing to the water's naturally high mineral content and hardness. Agricultural runoff can also introduce additional salts, further influencing the water's chemistry.

This mineral-rich water, often described as hard, can lead to scale buildup in common household appliances like kettles, hot water systems, and dishwashers, potentially reducing their efficiency and lifespan. Homeowners might notice soap scum residue in showers, which can leave skin feeling dry, and limescale rings appearing in toilets and on taps. To manage these effects, regular descaling with vinegar, using scale-inhibiting dishwasher tablets, or installing a shower filter can be beneficial. For persistent issues or for those with sensitive skin, a whole-house water softener is often recommended to combat scaling problems and prevent scaling problems. The Mildura Treatment Plant employs a multi-stage process including coagulation, flocculation, dissolved air flotation, filtration, chlorination, and fluoridation to ensure the water meets stringent Australian Drinking Water Guidelines.