Casula Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
319.8 mg/L
Est. Daily Cost
A$0.47
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 Casula, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Casula | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.7 yrs | 8.5 yrs | -45% |
| Washing Machine | 8.1 yrs | 12 yrs | -33% |
| Water Heater | 9.7 yrs | 15 yrs | -35% |
Regional Water Comparison
How Casula compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Casula, New South Wales | 147.5 mg/L | 🟠 Hard | reservoir |
| Prestons, New South Wales | 108.5 mg/L | 🟡 Moderately Hard | reservoir |
| Macquarie Fields, New South Wales | 160 mg/L | 🟠 Hard | reservoir |
| Liverpool, New South Wales | 72.5 mg/L | 🟡 Moderately Hard | reservoir |
| Hinchinbrook, New South Wales | 198.5 mg/L | 🔴 Very Hard | reservoir |
National Benchmark
How Casula compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Casula | 147.5 mg/L | 🟠 Moderate |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Casula's Water Unique?
Local geology and source profile
Casula's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant blending Warragamba Dam with a significant Hawkesbury-Nepean component for the Liverpool LGA outer south-western Sydney distribution in New South Wales. Water hardness in Casula is measured at 147.5 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Casula — a rapidly growing outer south-western Sydney suburb in the Liverpool LGA adjacent to the M5/M7 motorway interchange corridor, known for the Casula Powerhouse Arts Centre and its large residential estates attracting western Sydney families — receives supply with a substantial Hawkesbury-Nepean component, consistent with the elevated hardness of the Liverpool outer south-western supply zone.
Casula's elevated hardness reflects the proportionally significant Hawkesbury-Nepean component in the Liverpool outer south-west Prospect distribution blend. The Hawkesbury-Nepean system traverses the Cumberland Plain alluvial terrain and Triassic carbonate-cemented sedimentary deposits near the Liverpool–Campbelltown corridor — dissolving substantial calcium bicarbonate before Prospect treatment. The Casula Liverpool outer south-west distribution sub-zone at 147.5 mg/L and TDS 319.8 mg/L receives a notably elevated Hawkesbury-Nepean fraction, harder than the adjacent Prestons sub-zone (108.5 mg/L) in the same Liverpool LGA.
Casula residents face moderate to heavy limescale build-up on taps, shower screens, and in kettles — descaling every three to four weeks is typical. Hot water systems benefit from annual inspection. The elevated lead reading (0.004 mg/L) warrants briefly running the cold tap before use in Casula's established residential properties. Sydney Water provides water quality information at sydneywater.com.au, with all ADWG health standards consistently met. A point-of-use water filter is a practical investment for Casula's growing outer south-western Sydney residential community.
Geology & Source: Supplied by Sydney Water via the Prospect Water Filtration Plant blending Warragamba Dam with a significant Hawkesbury-Nepean component — the Casula Liverpool LGA outer south-western Sydney supply carries moderately hard water at 147.5 mg/L with TDS of 319.8 mg/L, reflecting the proportionally elevated Hawkesbury-Nepean contribution at this outer south-western Liverpool distribution corridor.