Como Water Hardness & Quality Report (2026)
Water Hardness
Source
mixed
pH Level
7.4
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
238 mg/L
Est. Daily Cost
A$0.34
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 Como, your appliances are currently losing 14% efficiency due to mineral buildup.
| Appliance | In Como | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6 yrs | 8.5 yrs | -29% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 11.3 yrs | 15 yrs | -25% |
Regional Water Comparison
How Como compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Como, Western Australia | 108 mg/L | 🟡 Moderately Hard | mixed |
| South Perth, Western Australia | 119 mg/L | 🟡 Moderately Hard | mixed |
| East Perth, Western Australia | 174 mg/L | 🟠 Hard | mixed |
| Perth, Western Australia | 230 mg/L | 🔴 Very Hard | mixed |
| Perth city centre, Western Australia | 151 mg/L | 🟠 Hard | mixed |
National Benchmark
How Como compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Como | 108 mg/L | 🟡 Low |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Como's Water Unique?
Local geology and source profile
Como's drinking water is supplied by the Water Corporation via the Integrated Water Supply Scheme (IWSS), incorporating a significant desalinated supply fraction and Mundaring Weir (Helena River/Darling Range) contribution for the City of South Perth LGA inner southern Perth distribution in Western Australia. Water hardness in Como is measured at 108 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Como — a well-established inner south Perth suburb of quality homes on the South Perth peninsula, overlooking the South Perth foreshore recreational strip and the Canning River at its junction with the Swan River — receives a notably softer supply than the harder northern Perth zones (Duncraig 232 mg/L, Landsdale 241 mg/L), reflecting a proportionally higher desalinated and Darling Range surface water fraction in the inner south Perth distribution.
Como's softer supply reflects a proportionally higher contribution from desalinated supply (Perth Seawater Desalination Plant) and Mundaring Weir (Helena River/Darling Range) surface catchment in the IWSS inner south Perth blend. The Mundaring Weir collects water from the Darling Range — Precambrian granite and laterite terrain contributing low-mineral, soft runoff — in sharp contrast to the hard Tamala Limestone Gnangara Mound groundwater dominant in northern Perth. The Como South Perth inner distribution at 108 mg/L and TDS 238 mg/L reflects this softer IWSS blend proportion in the inner southern metropolitan distribution corridor.
Como residents face moderate limescale build-up on taps and in kettles — descaling every three to four weeks is typical. Hot water systems benefit from periodic inspection. Solar hot water systems benefit from annual servicing. Under WA water restrictions, garden irrigation is limited to two days per week in summer. The very low lead reading (0.001 mg/L) is excellent. The Water Corporation provides water quality information at watercorporation.com.au, with all ADWG health standards consistently met throughout the inner south Perth Como corridor.
Geology & Source: Supplied by the Water Corporation via the Integrated Water Supply Scheme incorporating a significant desalinated supply fraction and Mundaring Weir (Helena River catchment) contribution — the Como South Perth inner southern supply carries moderately hard water at 108 mg/L with TDS of 238 mg/L, reflecting a higher desalinated and Darling Range surface water proportion in the inner south Perth distribution.