Diamond Creek Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
219 mg/L
Est. Daily Cost
A$0.31
energy & soap waste
Source: BOM National Performance Report & ADWG · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Diamond Creek, your appliances are currently losing 13% efficiency due to mineral buildup.
| Appliance | In Diamond Creek | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.4 yrs | 8.5 yrs | -25% |
| Washing Machine | 10 yrs | 12 yrs | -17% |
| Water Heater | 11.7 yrs | 15 yrs | -22% |
Regional Water Comparison
How Diamond Creek compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Diamond Creek, Victoria | 97.5 mg/L | 🟡 Moderately Hard | reservoir |
| South Morang, Victoria | 24 mg/L | 🟢 Soft | reservoir |
| Greensborough, Victoria | 16.5 mg/L | 🟢 Soft | reservoir |
| Eltham, Victoria | 32 mg/L | 🟢 Soft | reservoir |
| Doreen, Victoria | 80.5 mg/L | 🟡 Moderately Hard | reservoir |
National Benchmark
How Diamond Creek compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Diamond Creek | 97.5 mg/L | 🟡 Low |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Diamond Creek's Water Unique?
Local geology and source profile
Diamond Creek's drinking water is supplied by Yarra Valley Water as water retailer, with bulk supply from Melbourne Water incorporating a moderate Winneke Water Treatment Plant contribution for the Shire of Nillumbik LGA outer northern Melbourne distribution in Victoria. Water hardness in Diamond Creek is measured at 97.5 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Diamond Creek — a peaceful outer northern Melbourne community in the Nillumbik LGA on the Diamond Creek waterway, known for the Diamond Creek Railway Station on the Hurstbridge Line, the local village shopping strip, the Diamond Creek Velodrome, and the semi-rural residential character of the Nillumbik 'Green Wedge' outer northern Melbourne — receives slightly elevated supply from the outer northern Nillumbik Yarra Valley Water distribution network.
Diamond Creek's slightly elevated hardness reflects a moderate Winneke Water Treatment Plant contribution at the outer northern Nillumbik Yarra Valley Water distribution sub-zone. The Winneke plant draws from the Yarra River at Yering Gorge traversing Devonian basalt terrain — contributing moderate calcium relative to the very soft Yarra Ranges direct reservoir supply. The Diamond Creek outer northern Nillumbik distribution at 97.5 mg/L and TDS 219 mg/L reflects a moderate Winneke blending proportion, consistent with the slightly hard character of the outer northern Melbourne Yarra Valley Water supply zone in the Nillumbik Green Wedge corridor.
Diamond Creek residents can expect occasional 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 (0.004 mg/L) warrants briefly running the cold tap before use. Yarra Valley Water provides water quality information at yvw.com.au, with all ADWG health standards consistently met. Diamond Creek's Nillumbik Green Wedge community and the Diamond Creek village residential precinct benefit from a safe supply meeting all ADWG standards.
Geology & Source: Supplied by Yarra Valley Water (water retailer) and Melbourne Water (wholesale) incorporating a moderate Winneke Water Treatment Plant contribution — the Diamond Creek Nillumbik outer northern Melbourne supply carries slightly hard water at 97.5 mg/L with TDS of 219 mg/L, reflecting a moderate Winneke WTP fraction at this outer northern Nillumbik LGA Yarra Valley Water distribution sub-zone.