Gladstone Water Hardness & Quality Report (2026)

The Gladstone Area Water Board (GAWB) manages the Awoonga Water Supply Scheme. This system draws all its water from Awoonga Dam, which is situated on the Boyne River about 20 kilometers south of Gladstone, Queensland, Australia. The dam serves as the sole storage facility, capable of holding 776,854 megaliters (ML). Annually, it supplies around 50,000 ML to a mix of industrial, urban, and commercial customers. Notably, the Gladstone Regional Council reserves 10,300 ML per year for its own water distribution network. After extraction, the water undergoes treatment at the Gladstone Water Treatment Plant before being distributed throughout the Gladstone region, serving approximately 66,000 residents.

The watershed upstream of Awoonga Dam, located within the Calliope Range, is characterized by its rural, forested, and grazing lands. This area's geology is shaped by Mesozoic sedimentary sequences and Tertiary volcanics. Permeable sandstones, along with reactive basalts, contribute minerals to the water runoff. These geological features, combined with the subtropical climate and seasonal rainfall patterns, influence the water's mineral content. Wet season inflows tend to dilute the ions, while dry periods can concentrate them. Although land use like agriculture can introduce minor nutrients, the GAWB actively monitors the water to ensure it complies with established guidelines.

At its moderately hard level, this water can lead to noticeable scale buildup in appliances like kettles, showerheads, and dishwashers, reducing their efficiency within one to two years if left unaddressed. Hot water systems and washing machines are particularly susceptible, potentially increasing energy consumption and the need for more frequent cleaning. Homeowners can mitigate these effects through regular descaling with vinegar, installing low-flow aerators, and using detergents specifically formulated for hard water. For households experiencing significant limescale issues or blending with well water, installing a water softener is often recommended. The GAWB confirms that the water consistently meets the Australian Drinking Water Guidelines, with no detectable PFAS levels and key aesthetic parameters like hardness and dissolved oxygen remaining within acceptable limits.