Drouin Water Hardness & Quality Report (2026)

South East Water provides drinking water to Drouin, a town in Victoria's Baw Baw Shire. The main supply originates from the Tarago Reservoir, a crucial surface water source located in the Strzelecki Ranges. This reservoir's water is supplemented by groundwater drawn from the Deep Lead aquifer, situated in the Latrobe Valley region. Treatment occurs at the Tarago Water Treatment Plant, where a multi-step process including coagulation, flocculation, sedimentation, filtration, and chloramination is employed to ensure the water meets stringent Australian Drinking Water Guidelines. Residents in Drouin receive a blend of treated surface and groundwater.

The water's journey begins in the Strzelecki Ranges, where the Tarago Reservoir catchment is largely forested, helping to minimize sediment runoff. Geologically, this area is characterized by sedimentary rocks belonging to the Strzelecki Group, primarily sandstones and mudstones dating back to the Cretaceous period. In the broader Latrobe Valley area, the Deep Lead aquifer taps into paleochannels filled with gravelly sediments. These formations, along with underlying Tertiary basalts of the Older Volcanics, contribute to the water's naturally soft quality. The geology of Gippsland, including Victoria, generally results in soft water because the prevalent sandstones, basalts, and gravels dissolve fewer calcium and magnesium minerals compared to regions dominated by limestone.

Because the water is naturally soft, homeowners in Drouin will find it minimizes the buildup of scale in household plumbing, kettles, and appliances, which can extend the lifespan of these items and reduce maintenance. You'll likely notice that soaps and detergents lather up more easily, meaning you might be able to use less. While the soft water might feel 'slippery' on your skin after showering, it poses no threat to health and eliminates the need for a water softener. The water consistently meets Australian standards, with pH levels typically between 7.2 and 7.8. Trace elements like iron and manganese are effectively removed during the treatment process, and the water is monitored for safety and aesthetic qualities such as colour and odour, which remain excellent.