Miranda Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
167.6 mg/L
Est. Daily Cost
A$0.28
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 Miranda, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Miranda | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.7 yrs | 8.5 yrs | -21% |
| Washing Machine | 10.3 yrs | 12 yrs | -14% |
| Water Heater | 12.1 yrs | 15 yrs | -19% |
Regional Water Comparison
How Miranda compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Miranda, New South Wales | 88 mg/L | 🟡 Moderately Hard | reservoir |
| Caringbah, New South Wales | 42 mg/L | 🟢 Soft | reservoir |
| Sylvania, New South Wales | 51 mg/L | 🟢 Soft | reservoir |
| Caringbah South, New South Wales | 47.5 mg/L | 🟢 Soft | reservoir |
| Sutherland, New South Wales | 132 mg/L | 🟠 Hard | reservoir |
National Benchmark
How Miranda compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Miranda | 88 mg/L | 🟡 Low |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Miranda's Water Unique?
Local geology and source profile
Miranda's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant blending Warragamba Dam with a moderate Hawkesbury-Nepean component for the Sutherland Shire LGA southern Sydney distribution in New South Wales. Water hardness in Miranda is measured at 88 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Miranda — the Sutherland Shire's major commercial hub, home to Westfield Miranda shopping centre and the Miranda leisure precinct on the Kingsway commercial corridor — benefits from a supply with a moderate Hawkesbury-Nepean contribution, notably softer than the hard inner southern Kogarah (165.5 mg/L) in the adjacent Georges River LGA, confirming a softer supply profile for the Sutherland Shire than the broader inner southern Sydney supply zones.
Miranda's slightly elevated hardness reflects a moderate Hawkesbury-Nepean component in the Sutherland Shire southern Prospect distribution blend. The Hawkesbury-Nepean system traverses Cumberland Plain alluvial terrain and Triassic carbonate-cemented sedimentary deposits — dissolving moderate calcium bicarbonate before Prospect treatment. The Miranda Sutherland Shire distribution sub-zone at 88 mg/L and TDS 167.6 mg/L reflects a proportionally moderate Hawkesbury-Nepean fraction, substantially softer than the harder inner southern and Blacktown sub-zones, consistent with the soft supply character of the broader Sutherland Shire corridor.
Miranda 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 (0.003 mg/L) warrants briefly running the cold tap before use in older Miranda properties. Sydney Water provides water quality information at sydneywater.com.au, with all ADWG health standards consistently met. The Westfield Miranda shopping precinct and the wider Sutherland Shire business community benefit from a water supply well within ADWG aesthetic thresholds.
Geology & Source: Supplied by Sydney Water via the Prospect Water Filtration Plant blending Warragamba Dam with a moderate Hawkesbury-Nepean component — the Miranda Sutherland Shire southern Sydney supply carries slightly hard water at 88 mg/L, reflecting the moderate Hawkesbury-Nepean proportion at the Sutherland Shire southern Sydney distribution corridor, consistent with the broader Sutherland Shire supply range.