Brassall Water Hardness & Quality Report (2026)

Urban Utilities provides Brassall's water, with Seqwater managing the bulk supply. The water originates from the Wivenhoe Dam, Somerset Dam, and North Pine Dam, all part of the Brisbane River system. Treatment takes place at the Mt Crosby Water Treatment Plant (West Bank), which serves both Ipswich and Brassall. This facility uses a multi-stage process including coagulation, flocculation, sedimentation, filtration, and chloramination. Seqwater manages a network of 29 major dams across South East Queensland, securing water for more than 3 million residents, and Brassall is integrated into this central supply grid. The catchment area stretches across the Great Dividing Range and includes the Brisbane River Basin.

The geology underlying the Brassall supply features Triassic-Jurassic sandstones belonging to the Clarence-Moreton Basin, alongside Quaternary alluvium. These formations are known to leach calcium and magnesium ions into the water. While the mix of surface storages helps moderate extreme mineral content, the presence of underlying limestone deposits encourages a higher mineral profile compared to the softer water found in granitic upland areas. This geological interaction results in water that is moderately mineralised.

This moderately hard water can lead to visible limescale buildup on fixtures like taps and showerheads, as well as inside kettles. It also affects the efficiency of appliances such as washing machines and dishwashers, and can reduce the lifespan of boilers and hot water systems due to scale accumulation. Homeowners often find periodic descaling with vinegar helpful, and installing mesh screens on faucet aerators can catch scale particles. Using less detergent is another common adjustment. While not strictly necessary for health, a water softener is often recommended for households experiencing significant scale issues or for those who prefer softer water, particularly in inner areas of Brassall. The water consistently meets the Australian Drinking Water Guidelines, with a typical pH between 7.5 and 8.5, and uses chloramine for disinfection. Recent monitoring shows no concerning levels of lead or copper, and standard corrosion control measures are in place. PFAS levels remain low and compliant with health limits set by Seqwater.