Mount Annan Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
8.1
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
473.5 mg/L
Est. Daily Cost
A$0.63
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 Mount Annan, your appliances are currently losing 26% efficiency due to mineral buildup.
| Appliance | In Mount Annan | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.1 yrs | 8.5 yrs | -64% |
| Washing Machine | 6.3 yrs | 12 yrs | -48% |
| Water Heater | 7.7 yrs | 15 yrs | -49% |
Regional Water Comparison
How Mount Annan compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Mount Annan, New South Wales | 198 mg/L | 🔴 Very Hard | reservoir |
| Harrington Park, New South Wales | 102.5 mg/L | 🟡 Moderately Hard | reservoir |
| Campbelltown, New South Wales | 61 mg/L | 🟡 Moderately Hard | reservoir |
| Minto, New South Wales | 89 mg/L | 🟡 Moderately Hard | reservoir |
| Ingleburn, New South Wales | 93.5 mg/L | 🟡 Moderately Hard | reservoir |
National Benchmark
How Mount Annan compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mount Annan | 198 mg/L | 🔴 High |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Mount Annan's Water Unique?
Local geology and source profile
Mount Annan's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant with a very high Hawkesbury-Nepean component for the Camden LGA outer south-western Sydney distribution in New South Wales. Water hardness in Mount Annan is measured at 198 mg/L — classified as hard, just below the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Mount Annan — a large outer south-western Sydney suburb in the Camden LGA adjacent to Campbelltown, known for the Australian Botanic Garden Mount Annan (a major Sydney attraction), the Mount Annan and Camden Valley Way residential master-planned community, the Camden outer south-western growth corridor, and the established family residential character of this outer Sydney growth LGA — receives very hard supply approaching the ADWG aesthetic guideline, reflecting the dominant Hawkesbury-Nepean proportion in the outer south-western Prospect distribution.
Mount Annan's very hard supply reflects a dominant Hawkesbury-Nepean component in the outer south-western Camden Prospect distribution blend. The Hawkesbury-Nepean system traverses the Cumberland Plain alluvial valley and Triassic carbonate-cemented Hawkesbury Sandstone deposits — contributing very high dissolved calcium and minerals before Prospect treatment. At 198 mg/L and TDS 473.5 mg/L, the Mount Annan Camden distribution approaches the ADWG aesthetic guideline — comparable to Darlinghurst (197 mg/L) in the City of Sydney LGA — confirming that the outer south-western Camden supply receives essentially the same dominant Hawkesbury-Nepean proportion as the hardest inner city sub-zones.
Mount Annan residents face significant limescale build-up on taps and in kettles — descaling every four to six weeks is typical. Hot water systems benefit from regular annual inspection. The elevated lead reading (0.005 mg/L) warrants always briefly running the cold tap before drinking or cooking. Sydney Water provides water quality information at sydneywater.com.au, with all ADWG health standards consistently met. Mount Annan's Australian Botanic Garden community and the Camden outer south-western residential corridor benefit from supply meeting all ADWG safe standards.
Geology & Source: Supplied by Sydney Water via the Prospect Water Filtration Plant with a very high Hawkesbury-Nepean component — the Mount Annan Camden outer south-western Sydney supply carries hard water at 198 mg/L with elevated TDS of 473.5 mg/L, just below the ADWG aesthetic guideline of 200 mg/L, reflecting the dominant Hawkesbury-Nepean proportion in the Camden outer south-western Sydney Prospect distribution sub-zone.