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About Perth's water: Supply comes from desalination (36%), surface water from dams (18.7%), groundwater (44.6%), and groundwater replenishment. Groundwater-heavy areas like Mirrabooka, Neerabup and Yanchep tend to have higher hardness and TDS. Desalination-dominant areas like Mandurah and Rockingham are softer. All Perth town water meets Australian Drinking Water Guidelines health standards.