Wimbledon Park Water Hardness & Quality Report (2026)
Water Hardness
19.9°Clark28.4°fH15.9°dH
Source
mixed
pH Level
8.4
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
777 mg/L
Est. Daily Cost
£0.64
energy & soap waste
Source: DWI Data Portal · 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 Wimbledon Park, your appliances are currently losing 38% efficiency due to mineral buildup.
| Appliance | In Wimbledon Park | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3.1 yrs | 12 yrs | -74% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Wimbledon Park compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Wimbledon Park, Greater London | 283.5 mg/L | 19.9° | 🔴 Very Hard | mixed |
| Wimbledon, Greater London | 329.5 mg/L | 23.1° | 🔴 Very Hard | mixed |
| Earlsfield, Greater London | 203.5 mg/L | 14.3° | 🔴 Very Hard | mixed |
| Putney, Greater London | 230.5 mg/L | 16.2° | 🔴 Very Hard | mixed |
| Tooting, Greater London | 229 mg/L | 16.1° | 🔴 Very Hard | mixed |
National Benchmark
How Wimbledon Park compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Wimbledon Park | 283.5 mg/L | 🔴 High |
| United Kingdom National Avg | 183 mg/L | 🔴 High |
| Livingston Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Wimbledon Park's Water Unique?
Local geology and source profile
Thames Water supplies Wimbledon Park, the residential district in the London Borough of Merton adjacent to the All England Lawn Tennis Club — the quiet residential streets and parkland stretching from Wimbledon Park Lake (the ornamental lake of the former Wimbledon Park House estate) to the eastern edge of Wimbledon Common, in the shadow of the world's most famous tennis tournament — from the River Lee chalk-tributary supply and Thames blend in the Thames Water south London Merton distribution zone, treated at the Lee Valley Water Treatment Works complex. At 283.5 mg/L (19.9°Clark), Wimbledon Park's water is very hard — consistent with the Thames Water south London chalk-dominant supply that delivers persistently very hard water to the Merton and Wimbledon distribution zones.
Wimbledon Park lies in the Thames Water south London distribution zone where the Lee Valley chalk and Thames chalk-tributary blend deliver mineralised chalk groundwater from Hertfordshire and Chiltern Chalk catchments via the south London trunk mains. The combined chalk supply produces 283.5 mg/L with TDS 777 mg/L — very hard water characteristic of the south London Merton supply tier, consistent with adjacent Wimbledon (similar hardness) and Mitcham in the same Thames Water south London chalk supply zone.
At 283.5 mg/L, limescale is a persistent and significant household problem in Wimbledon Park. Kettles should be descaled every two to three weeks. The combi-boiler needs a fitted scale inhibitor and annual professional servicing. Washing-up liquid requires generous quantities for adequate lather. Taps and shower heads develop substantial white chalk deposits within a week to ten days; a fortnightly descaling with white vinegar or a proprietary product keeps fittings in good condition. The very hard south London chalk supply is as characteristic of Wimbledon Park domestic life as the two-week explosion of tennis in late June — annual, unavoidable, and requiring active management to keep things running smoothly.
Geology & Source: Supplied by Thames Water from the River Lee chalk-tributary supply in the south London Merton distribution zone — treated at Lee Valley Water Treatment Works — produces very hard water at 283.5 mg/L (19.9°Clark).