Ermington Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
87.7 mg/L
Est. Daily Cost
A$0.16
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 Ermington, your appliances are currently losing 7% efficiency due to mineral buildup.
| Appliance | In Ermington | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.9 yrs | 8.5 yrs | -7% |
| Washing Machine | 11.7 yrs | 12 yrs | -3% |
| Water Heater | 13.6 yrs | 15 yrs | -9% |
Regional Water Comparison
How Ermington compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Ermington, New South Wales | 50.5 mg/L | 🟢 Soft | reservoir |
| West Ryde, New South Wales | 71 mg/L | 🟡 Moderately Hard | reservoir |
| Carlingford, New South Wales | 41 mg/L | 🟢 Soft | reservoir |
| Eastwood, New South Wales | 90 mg/L | 🟡 Moderately Hard | reservoir |
| Rhodes, New South Wales | 42.5 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Ermington compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Ermington | 50.5 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Ermington's Water Unique?
Local geology and source profile
Ermington's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant drawing predominantly from Warragamba Dam (Nepean River system) for the Parramatta City LGA outer western Sydney distribution in New South Wales. Water hardness in Ermington is measured at 50.5 mg/L — classified as soft — well below the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Ermington — a residential suburb in the inner Parramatta City LGA on the Parramatta River adjacent to Rydalmere and West Ryde, known for the Ermington foreshore on the upper Parramatta River, the Ermington residential community connecting the Parramatta CBD and the Ryde-Parramatta corridor, and the inner western Parramatta River parklands foreshore — receives soft supply consistent with the predominantly Warragamba-dominant character of the inner Parramatta City Prospect distribution sub-zone.
Ermington's soft supply reflects a predominantly Warragamba Dam contribution with minimal Hawkesbury-Nepean blending at the inner Parramatta City Prospect distribution sub-zone. Warragamba Dam collects rainfall from the Blue Mountains sandstone plateau and Kanangra–Boyd granite uplands — chemically resistant terrain contributing negligible dissolved minerals — producing soft supply at 50.5 mg/L and TDS 87.7 mg/L. The Ermington inner Parramatta River sub-zone's predominantly Warragamba routing contrasts with the harder Northmead Parramatta sub-zone (88 mg/L) in the same LGA, confirming the supply blend variation across the Parramatta City distribution network.
Ermington residents enjoy low limescale accumulation on taps and in kettles — descaling every two to three months is typically adequate. Hot water systems accumulate minimal scale. The low lead reading (0.002 mg/L) is excellent. Sydney Water provides water quality information at sydneywater.com.au, with all ADWG health standards consistently met. Ermington's Parramatta River foreshore community benefits from this soft supply meeting all ADWG standards.
Geology & Source: Supplied by Sydney Water via the Prospect Water Filtration Plant drawing predominantly from Warragamba Dam — the Ermington Parramatta City outer western Sydney supply carries soft water at 50.5 mg/L with low TDS of 87.7 mg/L, reflecting the predominantly Warragamba-dominant supply with minimal Hawkesbury-Nepean component at the outer western Parramatta City LGA Ermington Parramatta River distribution sub-zone.