Annerley Water Hardness & Quality Report (2026)

Annerley residents receive their tap water from Urban Utilities, which sources bulk supply from Seqwater. The primary sources are surface waters drawn from Wivenhoe Dam, Somerset Dam, and North Pine Dam, all part of the Brisbane River watershed. Water is treated at major facilities like the Mt. Crosby Water Treatment Plant and the North Pine Water Treatment Plant before distribution to over 1.1 million people across South East Queensland, including suburbs like Annerley. These catchments stretch from the Great Dividing Range down through the Lockyer Valley.

The geology beneath South East Queensland is dominated by Mesozoic sedimentary rocks, specifically sandstones and siltstones belonging to the Clarence-Moreton Basin. These formations, dating back to the Triassic-Jurassic periods, are interspersed with minor layers of limestone and basalt. As water percolates through these strata, it picks up natural minerals, including calcium and magnesium. This geological interaction results in a moderately mineralised water character, avoiding the extremes of being overly soft and potentially corrosive or excessively hard and prone to scaling.

This moderately hard water means scale buildup is generally not a significant issue for most households, though appliances like kettles and showerheads can show some accumulation over time, potentially reducing their efficiency. Hot water systems might benefit from periodic descaling to maintain optimal performance. While a water softener is an option for those preferring even softer water or for aesthetic reasons, it's not typically necessary for general use or drinking. Urban Utilities also manages water quality through corrosion control measures to meet lead and copper standards, and the water is treated to meet the Australian Drinking Water Guidelines.