Clayton South Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.6
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
205.9 mg/L
Est. Daily Cost
A$0.29
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 Clayton South, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Clayton South | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.5 yrs | 8.5 yrs | -24% |
| Washing Machine | 10.2 yrs | 12 yrs | -15% |
| Water Heater | 11.9 yrs | 15 yrs | -21% |
Regional Water Comparison
How Clayton South compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Clayton South, Victoria | 93 mg/L | 🟡 Moderately Hard | reservoir |
| Clayton, Victoria | 93.5 mg/L | 🟡 Moderately Hard | reservoir |
| Springvale, Victoria | 111.5 mg/L | 🟡 Moderately Hard | reservoir |
| Springvale South, Victoria | 111.5 mg/L | 🟡 Moderately Hard | reservoir |
| Dingley Village, Victoria | 92.5 mg/L | 🟡 Moderately Hard | reservoir |
National Benchmark
How Clayton South compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Clayton South | 93 mg/L | 🟡 Low |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Clayton South's Water Unique?
Local geology and source profile
Clayton South's drinking water is supplied by South East Water as water retailer, with bulk supply from Melbourne Water incorporating a moderate Winneke Water Treatment Plant contribution for the Kingston City LGA outer south-eastern Melbourne distribution in Victoria. Water hardness in Clayton South is measured at 93 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Clayton South, in the Kingston City LGA — an established outer south-eastern Melbourne suburb adjacent to the Monash Freeway and the Springvale–Clayton corridor, known for the Clarinda residential estates, the Clayton Road retail strip, and the outer south-eastern Melbourne mixed industrial and residential character — receives slightly elevated supply from South East Water's Kingston outer south-eastern Melbourne distribution network.
Clayton South's slightly elevated hardness reflects a moderate Winneke Water Treatment Plant contribution at this outer south-eastern Kingston City 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 Clayton South outer south-eastern Kingston distribution at 93 mg/L and TDS 205.9 mg/L reflects a moderate Winneke WTP blending proportion in South East Water's outer south-eastern Melbourne supply network, consistent with the standard slightly hard South East Water distribution character in the Kingston–Monash corridor.
Clayton South 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 (0.004 mg/L) warrants briefly running the cold tap before use in older Clayton South properties. South East Water provides water quality information at southeastwater.com.au, with all ADWG health standards consistently met. Clayton South's established Kingston LGA residential community benefits from a safe supply meeting all ADWG safe drinking standards.
Geology & Source: Supplied by South East Water (water retailer) and Melbourne Water (wholesale) incorporating a moderate Winneke Water Treatment Plant contribution — the Clayton South Kingston outer south-eastern Melbourne supply carries slightly hard water at 93 mg/L, consistent with a moderate Winneke WTP fraction at this outer south-eastern Kingston Melbourne distribution sub-zone.