Eltham Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.2
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
57.2 mg/L
Est. Daily Cost
A$0.10
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 Eltham, your appliances are currently losing 4% efficiency due to mineral buildup.
| Appliance | In Eltham | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.5 yrs | 8.5 yrs | — |
| Washing Machine | 12.4 yrs | 12 yrs | — |
| Water Heater | 14.3 yrs | 15 yrs | -5% |
Regional Water Comparison
How Eltham compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Eltham, Victoria | 32 mg/L | 🟢 Soft | reservoir |
| Templestowe, Victoria | 47 mg/L | 🟢 Soft | reservoir |
| Templestowe Lower, Victoria | 47 mg/L | 🟢 Soft | reservoir |
| Doncaster East, Victoria | 83.5 mg/L | 🟡 Moderately Hard | reservoir |
| Greensborough, Victoria | 16.5 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Eltham compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Eltham | 32 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Eltham's Water Unique?
Local geology and source profile
Eltham's drinking water is supplied by Yarra Valley Water as water retailer, with bulk supply from Melbourne Water drawn from the Maroondah Reservoir and Upper Yarra Reservoir catchments in the Yarra Ranges, Victoria. Water hardness in Eltham is measured at 32 mg/L — classified as soft — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Eltham, in the Nillumbik LGA — Melbourne's famous 'arts and crafts' suburb along the Diamond Creek valley, known for its mud brick homes, Montsalvat artists' colony, and bushland setting — receives predominantly direct Yarra Ranges reservoir supply, consistent with adjacent Greensborough (16.5 mg/L) across the LGA boundary in the same supply corridor and similar to Eltham's own very soft Nillumbik environmental character.
Eltham's soft supply reflects the near-source Maroondah Reservoir and Yarra Ranges direct supply pathway to the Nillumbik Diamond Creek valley. The Watts River and Yering Gorge systems feeding Maroondah drain across Devonian granite and rhyodacite — highly resistant igneous terrain contributing negligible dissolved minerals. The Eltham Nillumbik distribution node receives predominantly direct Yarra Ranges supply with minimal Winneke WTP contribution, delivering the characteristic softness of Melbourne's near-source inner north-east supply corridor to this bush-setting community.
Eltham residents enjoy very low limescale accumulation on taps, in kettles, and around shower fittings — descaling is an occasional rather than regular task. Hot water systems accumulate minimal scale throughout their service life. Yarra Valley Water provides water quality information at yvw.com.au, with all ADWG health standards consistently met. The soft supply is a natural complement to Eltham's distinctive 'green change' lifestyle community, and the low lead reading (0.002 mg/L) confirms consistently safe, clean supply for families throughout this valued Nillumbik Diamond Creek valley residential precinct.
Geology & Source: Supplied by Yarra Valley Water (water retailer) and Melbourne Water (wholesale) from the Maroondah Reservoir and Upper Yarra catchment systems in the Yarra Ranges — the Eltham Nillumbik inner north-east Melbourne supply carries soft water at 32 mg/L, reflecting the near-source direct Yarra Ranges reservoir supply characteristic of the Nillumbik Diamond Creek valley corridor.