Bacchus Marsh Water Hardness & Quality Report (2026)

Bacchus Marsh's drinking water is supplied by Western Water, drawing primarily from the Lerderderg Reservoir on the Lerderderg River in the Lerderderg State Park and supplemented by Melbourne Water infrastructure connections, serving the Moorabool Valley community of Bacchus Marsh west of Melbourne, Victoria. Water hardness in Bacchus Marsh is measured at 15.5 mg/L — classified as very soft — far below the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. The extraordinarily low TDS of 25.9 mg/L confirms near-mineral-free supply at the Bacchus Marsh tap — remarkable for a rural market-garden town known for its intensive agricultural production.

Bacchus Marsh's very soft supply traces directly to the geology of the Lerderderg catchment. The Lerderderg River flows through the dramatic Lerderderg Gorge — a deep canyon carved through Devonian granite and metamorphic quartzite of the Cobaw and Great Dividing Ranges — terrain that is among the most chemically resistant on the continent and contributes negligible dissolved minerals. The protected Lerderderg State Park catchment delivers supply of exceptional purity to Bacchus Marsh, with hardness almost as low as the softest Melbourne metropolitan suburbs fed by the Thomson reservoir system.

Bacchus Marsh residents experience essentially no limescale accumulation on taps, kettles, or shower fittings — descaling is very rarely needed. Hot water systems accumulate negligible scale over their service life, making Bacchus Marsh one of the most appliance-friendly water supply areas outside the major capitals. At this very low hardness and TDS, the supply is among the softest in regional Victoria. Western Water provides water quality information at westernwater.com.au, with all ADWG health standards consistently met throughout the Moorabool Valley supply zone.