Kilsyth Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
250.3 mg/L
Est. Daily Cost
A$0.34
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 Kilsyth, your appliances are currently losing 14% efficiency due to mineral buildup.
| Appliance | In Kilsyth | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6 yrs | 8.5 yrs | -29% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 11.3 yrs | 15 yrs | -25% |
Regional Water Comparison
How Kilsyth compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Kilsyth, Victoria | 108 mg/L | 🟡 Moderately Hard | reservoir |
| Mooroolbark, Victoria | 25.5 mg/L | 🟢 Soft | reservoir |
| Croydon, Victoria | 25 mg/L | 🟢 Soft | reservoir |
| Lilydale, Victoria | 53.5 mg/L | 🟢 Soft | reservoir |
| Ringwood East, Victoria | 14.5 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Kilsyth compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Kilsyth | 108 mg/L | 🟡 Low |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Kilsyth's Water Unique?
Local geology and source profile
Kilsyth's drinking water is supplied by Yarra Valley Water as water retailer, with bulk supply from Melbourne Water incorporating a moderate-to-high Winneke Water Treatment Plant contribution for the Yarra Ranges Shire LGA outer eastern Melbourne distribution in Victoria. Water hardness in Kilsyth is measured at 108 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Kilsyth, in the Yarra Ranges Shire LGA — an outer eastern Melbourne suburb in the Maroondah-Kilsyth corridor, known for the Kilsyth South and Kilsyth residential community, the Jumping Creek Reserve and Dandenong Ranges foothills gateway character, the outer eastern Melbourne market garden and nursery corridor, and the Maroondah Highway commercial and residential corridor — receives slightly elevated supply from the Yarra Valley Water outer eastern Yarra Ranges distribution.
Kilsyth's slightly elevated hardness reflects a moderate-to-high Winneke Water Treatment Plant contribution at the outer eastern Yarra Ranges Yarra Valley Water distribution sub-zone. The Winneke WTP draws from the Yarra River at Yering Gorge traversing Devonian basalt and alluvial valley terrain — contributing moderate-to-elevated calcium relative to the very soft direct Yarra Ranges reservoir supply. The Kilsyth Yarra Ranges outer eastern distribution at 108 mg/L and TDS 250.3 mg/L reflects the elevated Winneke proportion at this outer foothills sub-zone, above the softer outer eastern sub-zones (Vermont South 16.5 mg/L) receiving near-zero Winneke blending.
Kilsyth 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 (0.005 mg/L) warrants always 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. Kilsyth's outer eastern Melbourne foothills community and the Dandenong Ranges gateway 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-to-high Winneke Water Treatment Plant contribution — the Kilsyth Yarra Ranges outer eastern Melbourne supply carries slightly hard water at 108 mg/L with TDS of 250.3 mg/L, reflecting the elevated Winneke WTP proportion in the outer eastern Yarra Ranges Yarra Valley Water distribution sub-zone.