Port Kennedy 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
692.8 mg/L
Est. Daily Cost
A$0.74
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 Port Kennedy, your appliances are currently losing 31% efficiency due to mineral buildup.
| Appliance | In Port Kennedy | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.9 yrs | 8.5 yrs | -78% |
| Washing Machine | 4.9 yrs | 12 yrs | -59% |
| Water Heater | 6.2 yrs | 15 yrs | -59% |
Regional Water Comparison
How Port Kennedy compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Port Kennedy, Western Australia | 234 mg/L | 🔴 Very Hard | mixed |
| Secret Harbour, Western Australia | 234 mg/L | 🔴 Very Hard | mixed |
| Warnbro, Western Australia | 108.5 mg/L | 🟡 Moderately Hard | mixed |
| Waikiki, Western Australia | 234.5 mg/L | 🔴 Very Hard | mixed |
| Baldivis, Western Australia | 231.5 mg/L | 🔴 Very Hard | mixed |
National Benchmark
How Port Kennedy compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Port Kennedy | 234 mg/L | 🔴 High |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Port Kennedy's Water Unique?
Local geology and source profile
Port Kennedy's drinking water is supplied by the Water Corporation via the Integrated Water Supply Scheme (IWSS), with a high groundwater proportion for the City of Rockingham LGA outer southern Perth distribution in Western Australia. Water hardness in Port Kennedy is measured at 234 mg/L — classified as very hard, exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Port Kennedy — a popular outer southern Rockingham suburb on Safety Bay adjacent to the Shoalwater Islands Marine Park, known for the Port Kennedy shopping centre, the Safety Bay coastal foreshore and beach, and the outer southern Perth coastal lifestyle community — carries very hard supply, dramatically harder than the Rockingham city centre (149.5 mg/L) and broader Rockingham (172 mg/L) sub-zones in the same Rockingham LGA.
Port Kennedy's elevated hardness reflects a very high Tamala Limestone and Gnangara Mound groundwater proportion in the outer southern Rockingham IWSS distribution. The outer southern Rockingham distribution zone draws proportionally more from Tamala Limestone aquifer groundwater — the porous Eocene carbonate formation of the Swan Coastal Plain — where calcium carbonate and associated dissolved salts accumulate heavily. Port Kennedy's outer coastal position at 234 mg/L and TDS 692.8 mg/L contrasts strikingly with the softer inner Rockingham city centre zone (149.5 mg/L), reflecting a substantially reduced desalinated supply proportion at the outer coastal extreme of the Rockingham IWSS distribution network.
Port Kennedy residents face significant daily limescale challenges — kettle descaling every one to two weeks is common, shower screens accumulate carbonate deposits, and hot water system elements require annual inspection. Solar hot water systems in WA's sunny 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 a high Gnangara Mound and local Tamala Limestone groundwater proportion — the Port Kennedy Rockingham outer southern Perth supply carries very hard water at 234 mg/L with extreme TDS of 692.8 mg/L, much harder than the adjacent Rockingham (172 mg/L) in the same LGA, reflecting a very high groundwater proportion in the outer southern Rockingham coastal distribution.