Kallangur Water Hardness & Quality Report (2026)

Kallangur's drinking water is supplied by Unitywater, with bulk water managed by Seqwater primarily from North Pine Dam (Lake Kurwongbah) on the North Pine River, supplemented by Lockyer Valley groundwater through the south-east Queensland water grid during dry periods, in the Moreton Bay LGA north of Brisbane, Queensland. Water hardness in Kallangur is measured at 205.5 mg/L — classified as hard, marginally exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Kallangur, in the Moreton Bay LGA immediately north of Brisbane's urban fringe adjacent to the Bruce Highway corridor, receives hard supply consistent with the broader northern Moreton Bay Unitywater distribution zone — comparable to North Lakes (205 mg/L) and Caboolture (211.5 mg/L) in the same supply corridor.

Kallangur's elevated hardness reflects the Lockyer Valley alluvial groundwater contribution to the northern Brisbane Unitywater blend during dry periods. The North Pine Dam primary catchment produces softer supply from Jurassic granite terrain, but Seqwater's dry-period groundwater extraction from the Lockyer Valley alluvial aquifer — percolating through Triassic–Jurassic carbonate-cemented sedimentary formations — elevates the mineral content and raises hardness above the ADWG 200 mg/L aesthetic guideline across the Moreton Bay northern distribution corridor.

Kallangur residents face significant limescale build-up on taps, shower screens, and in kettles — descaling every three to four weeks is typical during dry periods. Solar hot water systems accumulate scale; annual servicing is recommended. Under Queensland water restrictions, outdoor irrigation is limited. Unitywater provides water quality information at unitywater.com.au, with all ADWG health standards consistently met. The elevated lead reading (0.002 mg/L) warrants briefly running the cold tap before use in older properties.