Hyde Park Water Hardness & Quality Report (2026)
Water Hardness
19.2°Clark27.4°fH15.3°dH
Source
mixed
pH Level
8.3
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
738.5 mg/L
Est. Daily Cost
£0.62
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 Hyde Park, your appliances are currently losing 37% efficiency due to mineral buildup.
| Appliance | In Hyde Park | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3.5 yrs | 12 yrs | -71% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Hyde Park compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Hyde Park, Greater London | 274 mg/L | 19.2° | 🔴 Very Hard | mixed |
| Church Street, Greater London | 274 mg/L | 19.2° | 🔴 Very Hard | mixed |
| Marylebone, Greater London | 304.5 mg/L | 21.4° | 🔴 Very Hard | mixed |
| Little Venice, Greater London | 273.5 mg/L | 19.2° | 🔴 Very Hard | mixed |
| Bayswater, Greater London | 308.5 mg/L | 21.6° | 🔴 Very Hard | mixed |
National Benchmark
How Hyde Park compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Hyde Park | 274 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 Hyde Park's Water Unique?
Local geology and source profile
Thames Water supplies Hyde Park, the famous royal park and its surrounding residential district in the City of Westminster — London's largest and most celebrated central park, the site of the Great Exhibition of 1851 and the Crystal Palace, the Serpentine Gallery, Speakers' Corner, and Rotten Row, bordered by Kensington and Bayswater to the north and west and Knightsbridge to the south — from the River Lee chalk-tributary supply in the Thames Water central London distribution zone, treated at the Lee Valley Water Treatment Works complex. At 274 mg/L (19.2°Clark), Hyde Park's water is very hard — consistent with the Thames Water central London chalk-dominant supply that delivers persistently very hard water throughout the Westminster–Kensington W1/W2 distribution zone.
Hyde Park lies in the Thames Water central London distribution zone where the Lee Valley chalk and chalk-tributary Thames blend deliver mineralised chalk groundwater from Hertfordshire and Chiltern Chalk catchments. The chalk supply produces 274 mg/L with TDS 738.5 mg/L — very hard water with a moderate TDS/hardness ratio (2.70) consistent with the central London Westminster–Kensington chalk distribution tier, comparable to Lancaster Gate (273.5 mg/L) and Little Venice (273.5 mg/L) in the same Thames Water W1/W2 chalk supply zone.
At 274 mg/L, limescale is a persistent and significant household problem around Hyde 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 central London chalk supply at Hyde Park is as permanent a feature of central London life as the park itself — the chalk aquifer beneath the capital as enduring as the plane trees of Rotten Row.
Geology & Source: Supplied by Thames Water from the River Lee chalk-tributary supply in the central London Westminster–Kensington distribution zone — treated at Lee Valley Water Treatment Works — produces very hard water at 274 mg/L (19.2°Clark).