Marrickville Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
8
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
376.5 mg/L
Est. Daily Cost
A$0.53
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 Marrickville, your appliances are currently losing 22% efficiency due to mineral buildup.
| Appliance | In Marrickville | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.1 yrs | 8.5 yrs | -52% |
| Washing Machine | 7.4 yrs | 12 yrs | -38% |
| Water Heater | 8.9 yrs | 15 yrs | -41% |
Regional Water Comparison
How Marrickville compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Marrickville, New South Wales | 167 mg/L | 🟠 Hard | reservoir |
| Dulwich Hill, New South Wales | 172.5 mg/L | 🟠 Hard | reservoir |
| Newtown, New South Wales | 121 mg/L | 🟠 Hard | reservoir |
| Leichhardt, New South Wales | 110 mg/L | 🟡 Moderately Hard | reservoir |
| Camperdown, New South Wales | 59.5 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Marrickville compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Marrickville | 167 mg/L | 🟠 Moderate |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Marrickville's Water Unique?
Local geology and source profile
Marrickville's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant blending Warragamba Dam and Hawkesbury-Nepean supply for the inner western Sydney distribution in New South Wales. Water hardness in Marrickville is measured at 167 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Marrickville, in the Inner West Council LGA, receives supply from a distribution sub-zone with notably elevated hardness — significantly above the standard inner Sydney average (50 mg/L) — reflecting specific supply blend proportions in the inner-west distribution corridor.
Marrickville's elevated hardness reflects the specific blend composition reaching this inner-west Sydney distribution sub-zone. The Prospect plant's inner-west distribution corridor incorporates a proportionally higher share of the harder Hawkesbury-Nepean river component, which traverses the Triassic Cumberland Plain alluvial sediments and accumulates elevated calcium bicarbonate. Multiple inner western Sydney suburbs — Marrickville, Strathfield, Ryde, Maroubra — share this pattern of elevated hardness relative to the broader Sydney average, confirming a systematic supply blend characteristic of the specific distribution nodes serving these inner metropolitan zones.
Marrickville residents face significant limescale accumulation on taps, shower screens, and in kettles — descaling every four to six weeks is typical. Hot water systems benefit from annual inspection and element maintenance. The elevated lead reading (0.004 mg/L) warrants briefly running the cold tap before use in the suburb's extensive pre-1970 housing stock. Sydney Water provides water quality information at sydneywater.com.au, with all ADWG health standards consistently met throughout the Inner West supply network.
Geology & Source: Supplied by Sydney Water from the Prospect Water Filtration Plant serving the inner western Sydney distribution zone — the Marrickville Inner West supply carries moderately hard water at 167 mg/L with elevated TDS of 376.5 mg/L, reflecting specific supply blend characteristics in the inner-west Sydney distribution sub-zone that produces significantly harder water than the standard Sydney inner supply.