Ickenham Water Hardness & Quality Report (2026)
Water Hardness
~200–300 mg/L
Hardestimated · not lab-verified
Source
mixed
pH Level
7.9
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
340.2 mg/L
Est. Daily Cost
£0.57
energy & soap waste
Source: DWI Data Portal · Updated 2026
0–99
mg/L
Soft
100–149
mg/L
Slightly Hard
150–199
mg/L
Moderately Hard
200–300
mg/L
Hard
300+
mg/L
Very Hard
Appliance Damage Report
In Ickenham, your appliances are currently losing 33% efficiency due to mineral buildup.
| Appliance | In Ickenham | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.7 yrs | 8.5 yrs | -33% |
| Washing Machine | 8 yrs | 12 yrs | -33% |
| Water Heater | 10 yrs | 15 yrs | -33% |
Regional Water Comparison
How Ickenham compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Ickenham, Greater London | ≈ 200–300 mg/L | 17.5° | 🟠 Hard | mixed |
| Ruislip, Greater London | ≈ 300+ mg/L | 22.1° | 🔴 Very Hard | mixed |
| Hillingdon, Greater London | ≈ 300+ mg/L | 12.9° | 🔴 Very Hard | mixed |
| Ruislip Manor, Greater London | ≈ 300+ mg/L | 18.1° | 🔴 Very Hard | mixed |
| South Ruislip, Greater London | ≈ 300+ mg/L | 17.3° | 🔴 Very Hard | mixed |
National Benchmark
How Ickenham compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Ickenham | ≈ 200–300 mg/L | 🟠 High |
| United Kingdom National Avg | 177 mg/L | 🟡 Moderate |
| Skipton Top Rated | 7.1 mg/L | 🟢 None |
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What Makes Ickenham's Water Unique?
Local geology and source profile
Affinity Water supplies Ickenham with water drawn from Chiltern Chalk boreholes in the Colne Valley chalk belt. This water is then treated at the Iver Water Treatment Works. While the specific utility serving Ickenham is Thames Water, the geological makeup of the region, characterized by chalk and limestone deposits in the South East of England, is the primary driver of water hardness.
The water originates from the Chiltern Chalk formations, a type of bedrock common in the Colne Valley area. This chalk and limestone geology is known for dissolving minerals like calcium and magnesium as water percolates through it. The result is water with a high mineral content, classifying it as very hard.
This very hard water can lead to scale buildup in appliances like kettles and water heaters, potentially shortening their lifespan. You might also notice reduced lathering from soaps and detergents. To combat scale, regular descaling of appliances is recommended. If you find the hardness inconvenient, a water softener can significantly improve your experience with laundry and bathing.
Geology & Source: Chalk; limestone bedrock produces very hard water
Other Greater London Water Reports
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