Goulburn Water Hardness & Quality Report (2026)

Goulburn Mulwaree Council oversees the water for Goulburn, New South Wales, delivering it through the Goulburn Water Supply System. The primary sources are the Upper Lachlan River and Pejar Dam, with groundwater bores offering backup during drier times. Treated at the Goulburn Water Treatment Plant using coagulation, filtration, chlorination, and fluoridation, this system provides water to about 25,000 residents in both urban and rural areas.

The catchment area is situated in the Upper Lachlan River watershed on the Southern Tablelands. It features Paleozoic sedimentary rocks like sandstones and shales, overlaid by Tertiary basalts and Quaternary alluvium, all within the Lachlan Fold Belt. Crucially, there are no significant limestone aquifers. This geological makeup, dominated by siliceous rocks and soils low in carbonates, means very few minerals leach into the water, resulting in a soft water profile with naturally low alkalinity.

Because the water is soft, you'll likely notice minimal scale buildup in appliances like kettles, dishwashers, and water heaters. Soap will lather easily, requiring less product, and your laundry might appear brighter with less detergent. A water softener isn't necessary; however, it's wise to watch for potential pipe corrosion due to the water's low buffering capacity. Focus on checking for leaks and inspecting the anode rod in your water heater rather than descaling. The water quality consistently meets the Australian Drinking Water Guidelines.