Sunshine Coast Water Hardness & Quality Report (2026)

Unitywater supplies drinking water to the Sunshine Coast, Moreton Bay, and Noosa regions, drawing from the Mary River catchment and associated surface-water reservoirs, as well as groundwater from coastal aquifers. Treated water is delivered through Unitywater’s network of treatment plants and pumping stations. The main watershed is the Mary River catchment, which drains a mix of coastal-plain and low-relief hinterland terrain. The surface-water component flows through Quaternary sediments and coastal-plain deposits, while groundwater is drawn from Holocene to Pleistocene unconsolidated sands and gravels along the coastal strip.

These young, sandy formations do not strongly leach calcium and magnesium, so the water tends to be relatively low in dissolved minerals and therefore soft. The supply is generally soft, with Unitywater reporting it as less than 100 mg/L as CaCO3, falling within the ‘good quality’ range under the Australian Drinking Water Guidelines. The utility treats water using conventional processes such as coagulation, flocculation, sedimentation, filtration, and disinfection to maintain microbiological safety and clarity. PFAS data, where available, generally show low or non-detect levels in the Sunshine Coast zone.

Because the Sunshine Coast supply is generally soft, scale formation in kettles, water heaters, and dishwashers is minimal compared with harder-water regions. Appliances such as electric kettles and tankless water heaters will typically require less frequent descaling, and soap lathering is usually good. A water softener is generally not necessary for most households on this supply, though some residents may still choose one for aesthetic reasons or if they are sensitive to mineral taste. Unitywater publishes annual water-quality results by postcode, including parameters such as turbidity, pH, and disinfectant residuals.