Chester Hill 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
321.3 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 Chester Hill, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Chester Hill | 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 Chester Hill compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Chester Hill, New South Wales | 148 mg/L | 🟠 Hard | reservoir |
| Yagoona, New South Wales | 168 mg/L | 🟠 Hard | reservoir |
| Granville, New South Wales | 50 mg/L | 🟢 Soft | reservoir |
| Lidcombe, New South Wales | 101 mg/L | 🟡 Moderately Hard | reservoir |
| Auburn, New South Wales | 44.5 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Chester Hill compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Chester Hill | 148 mg/L | 🟠 Moderate |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Chester Hill's Water Unique?
Local geology and source profile
Chester Hill's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant incorporating a significant Hawkesbury-Nepean component for the Canterbury-Bankstown City LGA northern Sydney distribution in New South Wales. Water hardness in Chester Hill is measured at 148 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Chester Hill — a residential suburb in the northern Canterbury-Bankstown LGA along the East Hills and Bankstown rail corridor, known for the Chester Hill public school community, the local shopping strip, and the mixed residential character of this working-class northern Canterbury-Bankstown suburb — receives moderately hard supply consistent with the harder northern Canterbury-Bankstown distribution corridor.
Chester Hill's elevated hardness reflects a significant Hawkesbury-Nepean component in the northern Canterbury-Bankstown Prospect distribution blend. The Hawkesbury-Nepean system traverses Cumberland Plain alluvial terrain and Triassic carbonate-cemented sedimentary deposits contributing moderate dissolved calcium and minerals before Prospect treatment. The Chester Hill northern Canterbury-Bankstown distribution at 148 mg/L and TDS 321.3 mg/L receives a proportionally higher Hawkesbury-Nepean fraction than the softer southern Canterbury-Bankstown zones (Padstow 52.5 mg/L, Revesby 43.5 mg/L), consistent with the dramatically different supply routing across this large LGA.
Chester Hill residents can expect moderate limescale build-up on taps and in kettles — descaling every four to six weeks is typical. Hot water systems benefit from periodic inspection and descaling. The elevated lead reading (0.004 mg/L) warrants briefly running the cold tap before use. Sydney Water provides water quality information at sydneywater.com.au, with all ADWG health standards consistently met. Chester Hill's northern Canterbury-Bankstown residential community benefits from a safe supply meeting all ADWG standards.
Geology & Source: Supplied by Sydney Water via the Prospect Water Filtration Plant with a significant Hawkesbury-Nepean component — the Chester Hill Canterbury-Bankstown northern LGA supply carries moderately hard water at 148 mg/L with TDS of 321.3 mg/L, consistent with the harder northern Canterbury-Bankstown sub-zones (Yagoona 168 mg/L, Lakemba 135 mg/L) receiving a higher Hawkesbury-Nepean proportion than the softer southern zones.