Hamilton Hill Water Hardness & Quality Report (2026)
Water Hardness
Source
mixed
pH Level
8.1
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
587.2 mg/L
Est. Daily Cost
A$0.66
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 Hamilton Hill, your appliances are currently losing 28% efficiency due to mineral buildup.
| Appliance | In Hamilton Hill | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2.7 yrs | 8.5 yrs | -68% |
| Washing Machine | 5.9 yrs | 12 yrs | -51% |
| Water Heater | 7.2 yrs | 15 yrs | -52% |
Regional Water Comparison
How Hamilton Hill compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Hamilton Hill, Western Australia | 209 mg/L | 🔴 Very Hard | mixed |
| Leeming, Western Australia | 195 mg/L | 🔴 Very Hard | mixed |
| Nedlands, Western Australia | 172 mg/L | 🟠 Hard | mixed |
| Willetton, Western Australia | 184.5 mg/L | 🔴 Very Hard | mixed |
| Como, Western Australia | 108 mg/L | 🟡 Moderately Hard | mixed |
National Benchmark
How Hamilton Hill compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Hamilton Hill | 209 mg/L | 🔴 High |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Hamilton Hill's Water Unique?
Local geology and source profile
Hamilton Hill's drinking water is supplied by the Water Corporation via the Integrated Water Supply Scheme (IWSS), with a high Gnangara Mound and Tamala Limestone groundwater proportion for the City of Cockburn LGA outer southern Perth distribution in Western Australia. Water hardness in Hamilton Hill is measured at 209 mg/L — classified as hard, exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Hamilton Hill — a residential suburb in the outer southern Perth City of Cockburn LGA adjacent to Success and Spearwood, known for the Hamilton Hill residential community, the Cockburn Gateway Shopping City precinct at Success, the Bibra Lake wetlands reserve adjacent to the Cockburn corridor, and the outer southern Perth residential growth community near the Fremantle and Cockburn Sound coastal area — carries hard supply from the outer southern Cockburn IWSS distribution driven by the high groundwater proportion.
Hamilton Hill's elevated hardness reflects a high Tamala Limestone groundwater proportion in the outer southern Cockburn IWSS distribution. The Gnangara Mound groundwater percolates through the Superficial Aquifer and Tamala Limestone — the porous Eocene carbonate formation of the Swan Coastal Plain — accumulating heavily dissolved calcium carbonate and associated minerals. The Hamilton Hill outer southern Cockburn distribution at 209 mg/L and TDS 587.2 mg/L exceeds the ADWG aesthetic guideline, reflecting the elevated groundwater proportion relative to the desalinated supply fraction at this outer southern Perth distribution sub-zone.
Hamilton Hill residents face significant daily limescale challenges — kettle descaling every four to six weeks is typical, shower screens and tapware accumulate deposits, and hot water systems require regular inspection. Solar hot water systems in WA's climate benefit from annual servicing. Under WA water restrictions, garden irrigation is limited to two days per week. The elevated lead reading (0.004 mg/L) warrants briefly running the cold tap before use. The Water Corporation provides water quality information at watercorporation.com.au, with all ADWG health standards met.
Geology & Source: Supplied by the Water Corporation via the Integrated Water Supply Scheme with a high Gnangara Mound and Tamala Limestone groundwater proportion — the Hamilton Hill City of Cockburn outer southern Perth supply carries hard water at 209 mg/L with TDS of 587.2 mg/L, reflecting the elevated groundwater proportion in the outer southern Cockburn City Perth IWSS distribution sub-zone.