South Australia Tap Water Quality

Water Sources

South Australia is the driest state on the driest inhabited continent, and its water supply reflects that reality. Adelaide and surrounding areas depend heavily on the River Murray, which provides up to 90 percent of the city’s supply in dry years. Local catchments in the Mount Lofty Ranges, including the Mount Bold and Happy Valley reservoirs, supplement the Murray supply during wetter periods.

The Adelaide Desalination Plant at Port Stanvac, capable of producing 100 gigalitres per year, was built in response to the Millennium Drought and provides a rainfall-independent backup. Regional SA relies on a mix of River Murray pipeline systems, local reservoirs, and the vast Great Artesian Basin for groundwater supplies.

Treatment Approach

SA Water operates treatment plants across the state, employing conventional treatment including coagulation, sedimentation, filtration, and disinfection. Given that the River Murray often carries elevated levels of dissolved organic matter and nutrients, SA Water’s treatment processes are among the most intensive in Australia.

Activated carbon dosing is commonly used to manage taste and odour issues associated with algal blooms in the Murray. Fluoride is added to metropolitan and many regional supplies.

Key Challenges

Salinity and Hardness

South Australia consistently records some of the hardest water in the country. Water drawn from the River Murray accumulates salinity as it travels over 2,500 kilometres from its headwaters. Bore water in many regional areas is also naturally high in dissolved minerals.

Dependence on the River Murray

SA sits at the downstream end of the Murray-Darling Basin and is vulnerable to upstream extraction and drought. Water quality and availability are directly affected by conditions across New South Wales, Victoria, and Queensland.

Algal Blooms

Warm temperatures and nutrient loads in the River Murray and local reservoirs periodically trigger blue-green algal blooms, requiring additional treatment and monitoring.

Regulatory Framework

SA Health regulates drinking water quality under the Safe Drinking Water Act 2011. SA Water, the state’s primary water utility, operates under a regulatory framework overseen by the Essential Services Commission of South Australia (ESCOSA).

Infrastructure Highlights

SA’s water infrastructure includes the Murray Bridge to Onkaparinga pipeline system, the Adelaide Desalination Plant, and an extensive network of rural pipelines extending to remote pastoral communities. The Morgan to Whyalla pipeline, over 350 kilometres long, is one of the longest in Australia.