Hamilton Water Hardness & Quality Report (2026)

Hamilton's drinking water is supplied by Wannon Water (Wannon Region Water Corporation), drawing from the Grange Burn catchment and Lake Hamilton reservoir via the Hamilton water supply scheme for the Southern Grampians Shire Council LGA regional distribution in Victoria. Water hardness in Hamilton is measured at 109.5 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Hamilton — the regional capital of south-western Victoria and service hub for the Southern Grampians Shire, 290 km west of Melbourne, celebrated as Australia's 'Wool Capital of the World', known for the Hamilton Institute of Rural Learning, the International Sheep and Wool Showroom, the Hamilton Art Gallery (home to one of Australia's largest regional art collections), the Grampians tourism corridor, and the major regional service hub for Victoria's south-western pastoral country — receives slightly elevated supply from the Wannon Water Hamilton distribution.

Hamilton's slightly elevated hardness reflects the moderate mineralisation character of the Grange Burn catchment and Southern Grampians limestone geology in the south-western Victorian Wannon Water supply scheme. The Southern Grampians Shire terrain includes Devonian limestone, Tertiary sedimentary sequences, and Newer Volcanics basalt from the Grampians region — contributing moderate dissolved calcium and minerals compared to the very soft eastern Victorian granite catchments. At 109.5 mg/L and TDS 255 mg/L, Hamilton's supply reflects the moderate geological mineralisation of the Southern Grampians carbonate and basalt terrain traversed by the Grange Burn Hamilton supply catchment.

Hamilton residents can expect moderate limescale on taps and in kettles — descaling every two to three months is typically adequate. Hot water systems benefit from periodic inspection. The elevated lead reading (0.005 mg/L) warrants briefly running the cold tap before use. Wannon Water provides water quality information at wanwater.com.au, with all ADWG health standards consistently met. Hamilton's wool capital regional community and the Southern Grampians pastoral district benefits from a safe supply meeting all ADWG standards.