Runcorn Water Hardness & Quality Report (2026)

Residents of Runcorn, located in Brisbane's southside, receive their drinking water from Urban Utilities, which partners with Seqwater for bulk water sourcing and treatment. The water supply is a blend drawn from multiple sources: Wivenhoe Dam on the Brisbane River, Somerset Dam on the Stanley River, North Pine Dam, and groundwater from the North Pine Water Grid. Major treatment facilities, including the Wivenhoe and North Pine Water Treatment Plants, employ a multi-stage process of coagulation, flocculation, sedimentation, filtration, and chlorination before the water is distributed throughout the Moreton Bay and Brisbane City council areas. This comprehensive supply is managed across a vast 30,000 square kilometre area encompassing the Brisbane River and Lockyer Valley catchments.

The water's journey begins in the South East Queensland region, where it interacts with a diverse geological landscape. The underlying formations are primarily Mesozoic sandstones and siltstones, specifically the Triassic Bundamba Formation, which are covered by younger Pleistocene basalts and Quaternary alluvium. While significant limestone or dolomite deposits are scarce, trace minerals, including calcium and magnesium ions, are leached from these sedimentary rocks and basaltic soils. This natural dissolution process, occurring during surface runoff and subsurface flow within the Brisbane River and Stanley River catchments, contributes to the moderately mineralised character of the mixed water supply.

This moderately mineralised water, typically falling within good quality hardness levels of 60-200 mg/L CaCO3 equivalent, means you'll notice some scale buildup on appliances like kettles and showerheads over time. To keep your hot water systems and washing machines running smoothly, occasional descaling with a vinegar solution is recommended. You'll find that soap lathers adequately without needing excessive amounts, and a water softener isn't usually necessary unless you have a strong personal preference for softer water. Regular maintenance should be sufficient to ensure the longevity of your household fixtures. The water consistently meets the Australian Drinking Water Guidelines, maintaining a pH between 7.2-7.8 and showing no concerning levels of lead or copper at the tap.