Glen Iris Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
98 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 Glen Iris, your appliances are currently losing 7% efficiency due to mineral buildup.
| Appliance | In Glen Iris | 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 Glen Iris compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Glen Iris, Victoria | 51 mg/L | 🟢 Soft | reservoir |
| Camberwell, Victoria | 35.5 mg/L | 🟢 Soft | reservoir |
| Malvern East, Victoria | 68 mg/L | 🟡 Moderately Hard | reservoir |
| Carnegie, Victoria | 17 mg/L | 🟢 Soft | reservoir |
| Glenferrie, Victoria | 52.5 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Glen Iris compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Glen Iris | 51 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Glen Iris's Water Unique?
Local geology and source profile
Glen Iris's drinking water is supplied by South East Water as water retailer, with bulk supply from Melbourne Water drawn from the Thomson Reservoir and Upper Yarra Reservoir catchments in the Yarra Ranges, Victoria. Water hardness in Glen Iris is measured at 51 mg/L — classified as soft — well within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Glen Iris, in the Boroondara LGA of Melbourne's inner south-east, receives Melbourne Water's Yarra Ranges supply through the south-eastern metropolitan distribution network, with modest hardness slightly above the CBD reflecting the inner south-east distribution pathway.
Glen Iris's soft supply originates from Melbourne Water's protected Yarra Ranges catchments. The Thomson and Upper Yarra storages collect water draining across Devonian granite and rhyodacite — ancient igneous terrain contributing negligible dissolved minerals. The slightly higher hardness at Glen Iris (51 mg/L) compared to the Melbourne CBD (41.5 mg/L) reflects modest mineral pickup along the southern distribution pipeline route through the established Boroondara inner south-east residential corridor, consistent with the broader south Melbourne distribution characteristics.
Glen Iris residents benefit from low limescale accumulation on taps, in kettles, and around shower fittings — descaling every two to three months is generally adequate. Hot water systems accumulate minimal scale over their service life. The elevated lead reading (0.003 mg/L) warrants briefly running the cold tap before use in Glen Iris's extensive Edwardian and interwar period homes in the established Boroondara residential streetscapes. South East Water provides water quality information at southeastwater.com.au, with all ADWG health standards consistently met.
Geology & Source: Supplied by South East Water (water retailer) and Melbourne Water (wholesale) from the Thomson Reservoir and Upper Yarra catchment systems — the Glen Iris Boroondara inner south-east Melbourne supply carries soft water at 51 mg/L, slightly elevated above the CBD, consistent with the inner south-east distribution pathway characteristics.