Broome Water Hardness & Quality Report (2026)

Broome's drinking water is supplied by the Water Corporation, drawing from the Broome Borefield on the Broome Peninsula, extracting from the Broome Sandstone aquifer (Jurassic–Cretaceous) and overlying Miocene limestone and ancient coral reef formations of the Canning Basin coastal zone in the Kimberley region of Western Australia. Water hardness in Broome is measured at 357.5 mg/L — classified as very hard, substantially exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Broome — Western Australia's iconic Kimberley pearling city, famous for the Cable Beach sunset camel rides, the iconic Chinatown pearling heritage precinct, the Staircase to the Moon at Roebuck Bay, and the gateway to the vast Kimberley wilderness — carries the hardest urban water supply recorded in this dataset, reflecting the extreme mineralisation of its coastal Kimberley aquifer system.

Broome's extraordinary hardness reflects the Broome Sandstone (Jurassic–Cretaceous marine sedimentary) and overlying Miocene–Pleistocene limestone and coral reef geology of the Canning Basin coastal zone. The Broome Peninsula aquifer sits within porous Jurassic marine carbonate-cemented sandstone and Miocene coral reef limestone formations — where the combination of arid tropical climate (maximising evaporative mineral concentration), marine carbonate cementation, and the interaction of fresh-salt groundwater transition zones elevates calcium, magnesium, and total dissolved solids to extreme levels. The 357.5 mg/L and TDS 983.3 mg/L reflects this unique combination of Kimberley coastal geological and climate factors.

Broome residents face extremely severe daily limescale challenges — kettle descaling multiple times per week is essential, shower screens develop heavy scale rapidly, and hot water system elements require frequent annual inspection. Evaporative air conditioning systems (essential in Broome's tropical heat) accumulate scale heavily. The elevated lead reading (0.004 mg/L) warrants always briefly running the cold tap before drinking. The Water Corporation provides water quality information at watercorporation.com.au, with all ADWG health standards consistently met. A point-of-use water filter or softener is a near-necessity for Broome residents.