Glenwood Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
256 mg/L
Est. Daily Cost
A$0.39
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 Glenwood, your appliances are currently losing 17% efficiency due to mineral buildup.
| Appliance | In Glenwood | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.5 yrs | 8.5 yrs | -35% |
| Washing Machine | 9 yrs | 12 yrs | -25% |
| Water Heater | 10.6 yrs | 15 yrs | -29% |
Regional Water Comparison
How Glenwood compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Glenwood, New South Wales | 124 mg/L | 🟠 Hard | reservoir |
| Kellyville, New South Wales | 96 mg/L | 🟡 Moderately Hard | reservoir |
| Kellyville Ridge, New South Wales | 57 mg/L | 🟢 Soft | reservoir |
| Blacktown, New South Wales | 78 mg/L | 🟡 Moderately Hard | reservoir |
| The Ponds, New South Wales | 27 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Glenwood compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Glenwood | 124 mg/L | 🟠 Moderate |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Glenwood's Water Unique?
Local geology and source profile
Glenwood's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant blending Warragamba Dam storage with a significant Hawkesbury-Nepean component for the Blacktown LGA northern outer Sydney distribution in New South Wales. Water hardness in Glenwood is measured at 124 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Glenwood — a newer outer northern Blacktown LGA suburb on the Hills District escarpment boundary, known for the Glenwood residential estate development adjacent to Old Windsor Road and Blacktown Showground — receives supply substantially harder than the soft Mount Druitt sub-zone (30.5 mg/L) in the same Blacktown LGA, reflecting the marked northward hardness gradient across the Blacktown supply network toward the Hills District.
Glenwood's elevated hardness reflects the proportionally significant Hawkesbury-Nepean component in the northern Blacktown Prospect distribution blend. The Hawkesbury-Nepean system traverses Triassic Hawkesbury Sandstone and Cumberland Plain carbonate-cemented alluvial terrain — dissolving substantial calcium bicarbonate before Prospect treatment. The Glenwood northern Blacktown distribution sub-zone at 124 mg/L and TDS 256 mg/L sits in the hardness range of the outer Hills District (Cherrybrook 105.5 mg/L, West Pennant Hills 71 mg/L), reflecting the elevated Hawkesbury-Nepean proportion at the Blacktown-Hills District supply corridor boundary.
Glenwood residents face moderate limescale build-up on taps and in kettles — descaling every three to four weeks is typical. Hot water systems benefit from annual inspection. The elevated lead reading (0.003 mg/L) warrants briefly running the cold tap before use in newer Glenwood estate homes. Sydney Water provides water quality information at sydneywater.com.au, with all ADWG health standards consistently met. A point-of-use filter is a practical investment for Glenwood's growing outer northwestern 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 Glenwood Blacktown LGA northern outer supply carries moderately hard water at 124 mg/L with TDS of 256 mg/L, reflecting the elevated Hawkesbury-Nepean proportion at the northern Blacktown Hills District border distribution sub-zone.