Caulfield North Water Hardness & Quality Report (2026)

Caulfield North's drinking water is supplied by South East Water as water retailer, with bulk supply from Melbourne Water distributed through the inner southern metropolitan network in Victoria. Water hardness in Caulfield North is measured at 117.5 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Caulfield North, in the Glen Eira LGA — a prestigious inner southern Melbourne suburb known for the Caulfield Racecourse, Monash University's Caulfield campus, and the heritage Caulfield Park — carries the hardest supply of the three Glen Eira LGA sub-zones identified in this dataset (Carnegie 17 mg/L, Bentleigh 74 mg/L, Caulfield North 117.5 mg/L), demonstrating the remarkable sub-zone variation within a single metropolitan LGA.

Caulfield North's elevated hardness reflects a proportionally significant Winneke Water Treatment Plant blending at the northern Glen Eira Caulfield distribution sub-zone. The Winneke plant draws from the Yarra River at Yering Gorge across Devonian basalt and alluvial valley terrain — contributing substantially more calcium and magnesium than the soft Yarra Ranges granite reservoir supply. The Caulfield North northern Glen Eira corridor at 117.5 mg/L and TDS 280.1 mg/L receives a higher Winneke fraction than the Bentleigh (74 mg/L) sub-zone to its south and a far higher fraction than the very soft Carnegie (17 mg/L) sub-zone, confirming the fine-scale supply blend variation across South East Water's inner south distribution network.

Caulfield North residents face moderate to heavy limescale build-up on taps, shower screens, and in kettles — descaling every three to four weeks is typical. Hot water systems benefit from regular inspection. The elevated lead reading (0.005 mg/L) warrants always briefly running the cold tap before drinking, particularly in the many pre-1970s Caulfield terrace homes. South East Water provides water quality information at southeastwater.com.au, with all ADWG health standards consistently met.