Wantirna Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
106.1 mg/L
Est. Daily Cost
A$0.17
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 Wantirna, your appliances are currently losing 7% efficiency due to mineral buildup.
| Appliance | In Wantirna | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.8 yrs | 8.5 yrs | -8% |
| Washing Machine | 11.6 yrs | 12 yrs | -3% |
| Water Heater | 13.4 yrs | 15 yrs | -11% |
Regional Water Comparison
How Wantirna compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Wantirna, Victoria | 54.5 mg/L | 🟢 Soft | reservoir |
| Vermont, Victoria | 78.5 mg/L | 🟡 Moderately Hard | reservoir |
| Wantirna South, Victoria | 54.5 mg/L | 🟢 Soft | reservoir |
| Vermont South, Victoria | 16.5 mg/L | 🟢 Soft | reservoir |
| Ringwood, Victoria | 15 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Wantirna compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Wantirna | 54.5 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Wantirna's Water Unique?
Local geology and source profile
Wantirna'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 Knox City LGA outer eastern Melbourne distribution in Victoria. Water hardness in Wantirna is measured at 54.5 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Wantirna, in Knox City LGA — a well-established eastern Melbourne suburb known for the Knox City Shopping Centre, the Wantirna residential estate adjacent to the Dandenong Ranges escarpment, and the Wantirna Reserve and Dobsons Creek corridor parklands — receives slightly elevated supply consistent with a moderate Winneke WTP blending in the outer eastern Yarra Valley Water Knox distribution.
Wantirna's slightly elevated hardness reflects a moderate Winneke Water Treatment Plant contribution at this outer eastern Knox distribution sub-zone. The Winneke plant draws from the Yarra River at Yering Gorge traversing Devonian basalt terrain — contributing moderate calcium relative to the soft Yarra Ranges direct reservoir supply. The Wantirna outer eastern Knox distribution at 54.5 mg/L and TDS 106.1 mg/L reflects a moderate Winneke blending proportion, positioned between the near-pure soft outer eastern Dandenong Ranges reservoir supply zones and the inner Winneke-dominant zones.
Wantirna 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 (0.003 mg/L) warrants briefly running the cold tap before use in older Wantirna properties. Yarra Valley Water provides water quality information at yvw.com.au, with all ADWG health standards consistently met. The Knox City Shopping Centre precinct and Wantirna's Dandenong Ranges escarpment community 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 Wantirna Knox eastern Melbourne supply carries slightly hard water at 54.5 mg/L, consistent with the moderate Winneke WTP proportion at this outer eastern Knox Melbourne distribution sub-zone.