Perth vs Melbourne
Water hardness comparison — how the two cities differ and what it means for your home.
HarderFull Perth data →
Perth
australia
202mg/L
Very Hard Water
14.14°e
Very Hard
Base Unit (CaCO3): 202 mg/LLocal Unit
Melbourne
australia
38mg/L
Soft Water
2.66°e
Soft
Base Unit (CaCO3): 38 mg/LLocal Unit
Side-by-Side Impact
| Impact Area | Perth | Melbourne |
|---|---|---|
| Limescale buildup | Rapid — visible within weeks | Minimal |
| Boiler/heating risk | Annual descaling required | Low risk |
| Dishwasher salt setting | Max salt setting (5–7) | Low setting (1–2) |
| Skin & hair impact | High eczema/dry skin risk | Low risk |
| Detergent usage | +30–40% more detergent | Standard dose |
Key Findings
Hardness Difference: 164 mg/L
Perth is significantly harder than Melbourne — a difference that has major household implications. Appliances, boiler warranties, and detergent costs will differ substantially.
Moving from Melbourne to Perth?
If you're relocating from Melbourne to Perth, expect visible limescale on taps and shower heads within weeks. You'll need to recalibrate your dishwasher's salt setting, increase kettle descaling frequency, and check your boiler warranty requirements. A shower filter and under-sink scale inhibitor are worth considering immediately.