Blackburn South Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
138.7 mg/L
Est. Daily Cost
A$0.22
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 Blackburn South, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Blackburn South | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.4 yrs | 8.5 yrs | -13% |
| Washing Machine | 11.1 yrs | 12 yrs | -8% |
| Water Heater | 12.9 yrs | 15 yrs | -14% |
Regional Water Comparison
How Blackburn South compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Blackburn South, Victoria | 68 mg/L | 🟡 Moderately Hard | reservoir |
| Burwood East, Victoria | 49.5 mg/L | 🟢 Soft | reservoir |
| Blackburn, Victoria | 67.5 mg/L | 🟡 Moderately Hard | reservoir |
| Nunawading, Victoria | 40 mg/L | 🟢 Soft | reservoir |
| Forest Hill, Victoria | 98 mg/L | 🟡 Moderately Hard | reservoir |
National Benchmark
How Blackburn South compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Blackburn South | 68 mg/L | 🟡 Low |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Blackburn South's Water Unique?
Local geology and source profile
Blackburn South's drinking water is supplied by Yarra Valley Water as water retailer, with bulk supply from Melbourne Water incorporating a low-to-moderate Winneke Water Treatment Plant contribution for the Whitehorse City Council LGA inner eastern Melbourne distribution in Victoria. Water hardness in Blackburn South is measured at 68 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Blackburn South, in the Whitehorse City LGA — an established inner eastern Melbourne suburb adjacent to Blackburn, Forest Hill, and Nunawading, known for the Blackburn Lake Sanctuary wetland reserve and the Blackburn South residential community along the Dandenong Creek corridor, and the established inner eastern Melbourne character of the Whitehorse City corridor between the Deakin and Box Hill precincts — receives slightly elevated supply reflecting a moderate Winneke WTP blend at this Whitehorse City inner eastern distribution sub-zone.
Blackburn South's slightly elevated hardness reflects a low-to-moderate Winneke Water Treatment Plant contribution at the inner eastern Whitehorse City Yarra Valley Water sub-zone. The Winneke WTP draws from the Yarra River at Yering Gorge traversing Devonian basalt terrain, contributing moderate calcium. At 68 mg/L and TDS 138.7 mg/L, Blackburn South is slightly softer than the adjacent Vermont sub-zone (78.5 mg/L) in the same Whitehorse LGA, and both contrast with the extremely soft Vermont South (16.5 mg/L) in the same LGA, confirming the varied distribution routing across the Whitehorse City Yarra Valley Water sub-zones.
Blackburn South residents can expect occasional light limescale on taps and in kettles — descaling every two to three months is typically adequate. Hot water systems benefit from periodic inspection. The low lead reading (0.003 mg/L) is good. Yarra Valley Water provides water quality information at yvw.com.au, with all ADWG health standards consistently met. Blackburn South's Blackburn Lake Sanctuary wetland community and the Whitehorse City inner eastern residential corridor benefit from a safe supply meeting all ADWG standards.
Geology & Source: Supplied by Yarra Valley Water (water retailer) and Melbourne Water (wholesale) incorporating a low-moderate Winneke Water Treatment Plant contribution — the Blackburn South Whitehorse City inner eastern Melbourne supply carries slightly hard water at 68 mg/L with TDS of 138.7 mg/L, reflecting a low-to-moderate Winneke WTP proportion in the inner eastern Whitehorse City Yarra Valley Water Blackburn South distribution sub-zone.