High Wycombe Water Hardness & Quality Report (2026)
Water Hardness
Source
mixed
pH Level
8.3
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
703.8 mg/L
Est. Daily Cost
A$0.76
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 High Wycombe, your appliances are currently losing 32% efficiency due to mineral buildup.
| Appliance | In High Wycombe | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.7 yrs | 8.5 yrs | -80% |
| Washing Machine | 4.8 yrs | 12 yrs | -60% |
| Water Heater | 6.1 yrs | 15 yrs | -59% |
Regional Water Comparison
How High Wycombe compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ High Wycombe, Western Australia | 238.5 mg/L | 🔴 Very Hard | mixed |
| Forrestfield, Western Australia | 238 mg/L | 🔴 Very Hard | mixed |
| Bassendean, Western Australia | 136 mg/L | 🟠 Hard | mixed |
| Bayswater, Western Australia | 111 mg/L | 🟡 Moderately Hard | mixed |
| Rivervale, Western Australia | 223.5 mg/L | 🔴 Very Hard | mixed |
National Benchmark
How High Wycombe compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ High Wycombe | 238.5 mg/L | 🔴 High |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes High Wycombe's Water Unique?
Local geology and source profile
High Wycombe's drinking water is supplied by the Water Corporation via the Integrated Water Supply Scheme (IWSS), with dominant local Darling Range foothill aquifer groundwater for the City of Kalamunda LGA eastern Perth hills distribution in Western Australia. Water hardness in High Wycombe is measured at 238.5 mg/L — classified as hard, substantially exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. High Wycombe — a large eastern Perth suburb in the Kalamunda LGA at the base of the Darling Range, known for the High Wycombe residential growth estates, the Midland Gate Shopping Centre precinct nearby, and the eastern Perth hills gateway residential community along the Roe Highway and Kalamunda Road corridor — carries very hard supply almost identical to adjacent Forrestfield (238 mg/L) in the same Kalamunda LGA, confirming the consistently hard groundwater character of the outer eastern Perth Kalamunda hills distribution.
High Wycombe's elevated hardness reflects the dominant groundwater proportion in the outer eastern Kalamunda IWSS distribution, drawing from Tamala Limestone superficial aquifer and local Darling Range foothill weathered granite and lateritic ironstone aquifers. These eastern Perth foothill aquifers accumulate significant dissolved minerals through the deep lateritic soil profile. The High Wycombe outer eastern Kalamunda distribution at 238.5 mg/L and TDS 703.8 mg/L is almost identical to Forrestfield (238 mg/L), confirming the uniform hard groundwater character of the outer eastern Perth Kalamunda hills supply corridor.
High Wycombe residents face significant daily limescale challenges — kettle descaling every one to two weeks is common, shower screens and tapware accumulate heavy deposits, and hot water systems require annual inspection. Solar hot water systems in WA's climate need regular servicing. Under WA water restrictions, garden irrigation is limited to two days per week. The elevated lead reading (0.005 mg/L) warrants always briefly running the cold tap before drinking. 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 dominant local Darling Range foothill aquifer groundwater — the High Wycombe Kalamunda eastern Perth hills supply carries hard water at 238.5 mg/L with extreme TDS of 703.8 mg/L, almost identical to adjacent Forrestfield (238 mg/L) in the same Kalamunda LGA, reflecting the consistently hard groundwater-dominant character of the outer eastern Perth Kalamunda hills distribution.