San Diego vs London
Water hardness comparison — how the two cities differ and what it means for your home.
San Diego
united states
219mg/L
Very Hard Water
15.33°e
Very Hard
Base Unit (CaCO3): 219 mg/LLocal Unit
HarderFull London data →
London
united kingdom
277mg/L
Very Hard Water
19.39°e
Very Hard
Base Unit (CaCO3): 277 mg/LLocal Unit
Side-by-Side Impact
| Impact Area | San Diego | London |
|---|---|---|
| Limescale buildup | Rapid — visible within weeks | Rapid — visible within weeks |
| Boiler/heating risk | Annual descaling required | Annual descaling required |
| Dishwasher salt setting | Max salt setting (5–7) | Max salt setting (5–7) |
| Skin & hair impact | High eczema/dry skin risk | High eczema/dry skin risk |
| Detergent usage | +30–40% more detergent | +30–40% more detergent |
Key Findings
Hardness Difference: 58 mg/L
London is meaningfully harder than San Diego. Residents moving between these cities should adjust dishwasher salt settings, descaling frequency, and boiler service schedules.
Moving from San Diego to London?
If you're relocating from San Diego to London, 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.
Compare With Other Cities
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