Forest Hill 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
220.1 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 Forest Hill, your appliances are currently losing 13% efficiency due to mineral buildup.
| Appliance | In Forest Hill | 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 Forest Hill compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Forest Hill, Victoria | 98 mg/L | 🟡 Moderately Hard | reservoir |
| Vermont, Victoria | 78.5 mg/L | 🟡 Moderately Hard | reservoir |
| Nunawading, Victoria | 40 mg/L | 🟢 Soft | reservoir |
| Mitcham, Victoria | 45 mg/L | 🟢 Soft | reservoir |
| Vermont South, Victoria | 16.5 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Forest Hill compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Forest Hill | 98 mg/L | 🟡 Low |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Forest Hill's Water Unique?
Local geology and source profile
Forest Hill'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 Whitehorse City Council LGA inner eastern Melbourne distribution in Victoria. Water hardness in Forest Hill is measured at 98 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Forest Hill, in the Whitehorse City LGA — an established inner eastern Melbourne suburb adjacent to Vermont and Nunawading, known for the Forest Hill Chase Shopping Centre, the Nunawading Link Road industrial and commercial precinct, and the established inner eastern Melbourne residential community of the Whitehorse City corridor — receives the hardest supply of the imported Whitehorse LGA sub-zones, reflecting a higher Winneke WTP proportion at the Forest Hill distribution sub-zone.
Forest Hill's slightly elevated hardness reflects a moderate Winneke Water Treatment Plant contribution at the inner eastern Whitehorse City Yarra Valley Water sub-zone — higher than the Vermont (78.5 mg/L) and Blackburn South (68 mg/L) sub-zones in the same Whitehorse LGA. The Winneke WTP draws from the Yarra River at Yering Gorge traversing Devonian basalt terrain, contributing moderate calcium. At 98 mg/L and TDS 220.1 mg/L, Forest Hill is the hardest Whitehorse LGA imported sub-zone — confirming significant distribution routing variation across the Whitehorse City Yarra Valley Water sub-zones despite geographic proximity.
Forest Hill residents can expect 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. Forest Hill's inner eastern Melbourne residential and commercial community benefits 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 Forest Hill Whitehorse City inner eastern Melbourne supply carries slightly hard water at 98 mg/L with TDS of 220.1 mg/L, harder than the Vermont (78.5 mg/L) and Blackburn South (68 mg/L) sub-zones in the same Whitehorse LGA, reflecting a higher Winneke WTP proportion in the Forest Hill distribution sub-zone.