Kingsgrove Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.9
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
348.5 mg/L
Est. Daily Cost
A$0.50
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 Kingsgrove, your appliances are currently losing 21% efficiency due to mineral buildup.
| Appliance | In Kingsgrove | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.4 yrs | 8.5 yrs | -48% |
| Washing Machine | 7.8 yrs | 12 yrs | -35% |
| Water Heater | 9.3 yrs | 15 yrs | -38% |
Regional Water Comparison
How Kingsgrove compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Kingsgrove, New South Wales | 157.5 mg/L | 🟠 Hard | reservoir |
| Bexley, New South Wales | 117.5 mg/L | 🟡 Moderately Hard | reservoir |
| Beverly Hills, New South Wales | 145 mg/L | 🟠 Hard | reservoir |
| Belmore, New South Wales | 145 mg/L | 🟠 Hard | reservoir |
| Roselands, New South Wales | 90.5 mg/L | 🟡 Moderately Hard | reservoir |
National Benchmark
How Kingsgrove compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Kingsgrove | 157.5 mg/L | 🟠 Moderate |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Kingsgrove's Water Unique?
Local geology and source profile
Kingsgrove'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 distribution in New South Wales. Water hardness in Kingsgrove is measured at 157.5 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Kingsgrove — an established residential suburb spanning the Canterbury-Bankstown and Georges River LGA boundary along the Illawarra rail line, known for the Kingsgrove residential community, the local shopping strip on Kingsgrove Road, and the mixed residential and commercial character of this inner southern Sydney suburb adjacent to Bexley and Rockdale — receives moderately hard supply consistent with the harder Canterbury-Bankstown distribution corridor.
Kingsgrove's moderately hard supply reflects a significant Hawkesbury-Nepean component in the Canterbury-Bankstown Prospect distribution blend. The Hawkesbury-Nepean system traverses Cumberland Plain alluvial terrain and Triassic carbonate-cemented deposits contributing moderate dissolved calcium and minerals before Prospect treatment. The Kingsgrove distribution at 157.5 mg/L and TDS 348.5 mg/L receives a proportionally higher Hawkesbury-Nepean fraction than the softer southern Canterbury-Bankstown sub-zones (Padstow 52.5 mg/L, Revesby 43.5 mg/L), consistent with the moderately hard northern-central Canterbury-Bankstown supply corridor.
Kingsgrove 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. 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. Kingsgrove's inner southern Sydney residential community and the Kingsgrove Road commercial precinct benefit 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 Kingsgrove Canterbury-Bankstown LGA supply carries moderately hard water at 157.5 mg/L with TDS of 348.5 mg/L, consistent with the harder northern-central Canterbury-Bankstown distribution corridor receiving a proportionally higher Hawkesbury-Nepean fraction than the softer southern sub-zones.