Green Valley Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
250.6 mg/L
Est. Daily Cost
A$0.39
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 Green Valley, your appliances are currently losing 16% efficiency due to mineral buildup.
| Appliance | In Green Valley | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.6 yrs | 8.5 yrs | -34% |
| Washing Machine | 9.1 yrs | 12 yrs | -24% |
| Water Heater | 10.7 yrs | 15 yrs | -29% |
Regional Water Comparison
How Green Valley compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Green Valley, New South Wales | 122 mg/L | 🟠 Hard | reservoir |
| Hinchinbrook, New South Wales | 198.5 mg/L | 🔴 Very Hard | reservoir |
| Prestons, New South Wales | 108.5 mg/L | 🟡 Moderately Hard | reservoir |
| Bossley Park, New South Wales | 95.5 mg/L | 🟡 Moderately Hard | reservoir |
| Casula, New South Wales | 147.5 mg/L | 🟠 Hard | reservoir |
National Benchmark
How Green Valley compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Green Valley | 122 mg/L | 🟠 Moderate |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Green Valley's Water Unique?
Local geology and source profile
Green Valley's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant incorporating a moderate Hawkesbury-Nepean component for the Liverpool City LGA outer south-western Sydney distribution in New South Wales. Water hardness in Green Valley is measured at 122 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Green Valley — a large outer south-western Sydney suburb in the Liverpool LGA, known for the Green Valley Plaza shopping centre, the multicultural residential community of the Western Sydney outer south-western growth corridor, and the large family residential estates characteristic of the Liverpool LGA — receives moderately hard supply reflecting a moderate Hawkesbury-Nepean proportion in the outer south-western Liverpool Prospect distribution blend.
Green Valley's moderately hard supply reflects a moderate Hawkesbury-Nepean component in the outer south-western Liverpool Prospect distribution blend. The Hawkesbury-Nepean system traverses Cumberland Plain alluvial terrain and Triassic carbonate-cemented Hawkesbury Sandstone deposits contributing moderate dissolved calcium and minerals before Prospect treatment. The Green Valley outer south-western Liverpool distribution at 122 mg/L and TDS 250.6 mg/L receives a moderate Hawkesbury-Nepean fraction consistent with the moderately hard character of the outer south-western Sydney supply corridor in the Liverpool LGA.
Green Valley residents can expect moderate limescale build-up 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. Sydney Water provides water quality information at sydneywater.com.au, with all ADWG health standards consistently met. Green Valley's outer south-western Sydney residential community and the Liverpool LGA growth corridor benefit from a safe supply meeting all ADWG standards.
Geology & Source: Supplied by Sydney Water via the Prospect Water Filtration Plant with a moderate Hawkesbury-Nepean component — the Green Valley Liverpool outer south-western Sydney supply carries moderately hard water at 122 mg/L with TDS of 250.6 mg/L, reflecting a moderate Hawkesbury-Nepean proportion at this outer south-western Liverpool LGA Prospect distribution sub-zone.