Warner Water Hardness & Quality Report (2026)

Warner's drinking water is supplied by Unitywater as water retailer, with bulk supply from Seqwater incorporating dominant Lockyer Valley groundwater supplementation through the south-east Queensland water grid for the Moreton Bay Regional Council LGA outer northern Brisbane distribution in Queensland. Water hardness in Warner is measured at 275.5 mg/L — classified as hard, substantially exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Warner — a large residential suburb in the outer northern Moreton Bay Regional Council LGA on the North Lakes-Petrie outer northern Brisbane growth corridor, known for the Warner residential estate community, the Samford Valley and Mount Mee hinterland, and the outer northern Brisbane growth area adjacent to North Lakes and Petrie — receives very hard supply consistent with the SEQ water grid's dominant Lockyer Valley groundwater-driven supply for the Moreton Bay Unitywater distribution.

Warner's very hard supply reflects the dominant Lockyer Valley groundwater proportion in the outer northern Moreton Bay Unitywater SEQ supply blend. The Lockyer Valley alluvial aquifer percolates through highly mineralised Jurassic–Cretaceous carbonate-cemented Darling Downs formations — accumulating very high dissolved calcium, magnesium, and carbonates — driving the Warner Moreton Bay distribution to 275.5 mg/L and extreme TDS 803.4 mg/L. Warner's supply hardness is among the highest recorded in the outer northern Moreton Bay SEQ distribution, reflecting the dominant groundwater fraction at this Unitywater sub-zone.

Warner residents face significant daily limescale challenges — kettle descaling every one to two weeks is typical, shower screens and tapware accumulate heavy deposits, and hot water systems require annual inspection. Under Queensland water restrictions, outdoor watering is regulated. The elevated lead reading (0.005 mg/L) warrants briefly running the cold tap before use. Unitywater provides water quality data online, with all ADWG health standards consistently met. Warner's outer northern Brisbane growth community benefits from supply meeting all ADWG safe drinking standards.