Winston Hills Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.6
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
223.8 mg/L
Est. Daily Cost
A$0.35
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 Winston Hills, your appliances are currently losing 15% efficiency due to mineral buildup.
| Appliance | In Winston Hills | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.9 yrs | 8.5 yrs | -31% |
| Washing Machine | 9.5 yrs | 12 yrs | -21% |
| Water Heater | 11.1 yrs | 15 yrs | -26% |
Regional Water Comparison
How Winston Hills compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Winston Hills, New South Wales | 111.5 mg/L | 🟡 Moderately Hard | reservoir |
| Northmead, New South Wales | 88 mg/L | 🟡 Moderately Hard | reservoir |
| Baulkham Hills, New South Wales | 160.5 mg/L | 🟠 Hard | reservoir |
| North Parramatta, New South Wales | 170 mg/L | 🟠 Hard | reservoir |
| Westmead, New South Wales | 45 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Winston Hills compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Winston Hills | 111.5 mg/L | 🟡 Low |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Winston Hills's Water Unique?
Local geology and source profile
Winston Hills' drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant with a moderate Hawkesbury-Nepean component for the Parramatta City LGA outer western Sydney Hills district distribution in New South Wales. Water hardness in Winston Hills is measured at 111.5 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Winston Hills — a residential suburb in the outer western Sydney Parramatta City LGA on the edge of the Hills district, known for the Winston Hills Mall on Caroline Chisholm Drive, the Winston Hills residential estate community, the Binalong Road residential corridor connecting the Hills district to the Parramatta urban core, and the established family-oriented residential character of this Hills district gateway community — receives slightly elevated supply from the Prospect distribution reflecting a moderate Hawkesbury-Nepean proportion.
Winston Hills' slightly elevated hardness reflects a moderate Hawkesbury-Nepean component in the outer western Hills district Parramatta Prospect distribution blend. The Hawkesbury-Nepean system traverses Cumberland Plain alluvial terrain and Triassic carbonate-cemented Hawkesbury Sandstone deposits contributing moderate dissolved calcium before Prospect treatment. The Winston Hills Parramatta outer western distribution at 111.5 mg/L and TDS 223.8 mg/L reflects the moderate Hawkesbury-Nepean proportion at this Hills district sub-zone — harder than the very soft outer Blacktown sub-zones (The Ponds 27 mg/L, Toongabbie West 27.5 mg/L) in nearby Blacktown LGA, confirming different distribution main supply routings across the neighbouring western Sydney LGAs.
Winston Hills 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 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. Winston Hills' Hills district residential community and the Winston Hills Mall precinct 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 Winston Hills Parramatta outer western Sydney supply carries slightly hard water at 111.5 mg/L with TDS of 223.8 mg/L, reflecting the moderate Hawkesbury-Nepean proportion in the outer western Hills district Parramatta City LGA Prospect distribution sub-zone.