Bletchley Water Hardness & Quality Report (2026)
Water Hardness
14.1°Clark20.1°fH11.3°dH
Source
mixed
pH Level
7.9
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
494.5 mg/L
Est. Daily Cost
£0.46
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 Bletchley, your appliances are currently losing 27% efficiency due to mineral buildup.
| Appliance | In Bletchley | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3 yrs | 8.5 yrs | -65% |
| Washing Machine | 6.2 yrs | 12 yrs | -48% |
| Water Heater | 7.6 yrs | 15 yrs | -49% |
Regional Water Comparison
How Bletchley compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Bletchley, South East | 201 mg/L | 14.1° | 🔴 Very Hard | mixed |
| Milton Keynes, South East | 199.5 mg/L | 14° | 🔴 Very Hard | mixed |
| Newport Pagnell, South East | 293 mg/L | 20.6° | 🔴 Very Hard | mixed |
| Leighton Buzzard, East of England | 184.5 mg/L | 12.9° | 🔴 Very Hard | mixed |
| Aylesbury, South East | 279 mg/L | 19.6° | 🔴 Very Hard | mixed |
National Benchmark
How Bletchley compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Bletchley | 201 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 Bletchley's Water Unique?
Local geology and source profile
Bletchley, in the Borough of Milton Keynes on the Great Ouse flood plain, is supplied by Affinity Water from the Great Ouse river catchment and the Jurassic Limestone and Chalk Aquifer of the south Bedfordshire and Buckinghamshire country. Affinity Water draws from the Great Ouse at Ely (via the Grafham Water supply scheme) and from licensed boreholes in the Jurassic Great Oolite and Cornbrash Limestone of the Milton Keynes/south Bucks plateau, supplemented by some Cretaceous Chalk groundwater from the Chiltern chalk dip slope. The Ouse catchment carries dissolved calcium from the Jurassic limestone country of south Midlands. The combination of Jurassic limestone groundwater and Ouse-borne calcium produces the moderately hard supply for the Bletchley/Milton Keynes area.
Bletchley's hardness of 201 mg/L (14.1°Clark) reflects the Jurassic Great Oolite Limestone and Great Ouse catchment chemistry. The Jurassic oolitic limestone of the Bucks/Beds plateau contributes moderate dissolved calcium. The Drinking Water Inspectorate (DWI) classifies this supply as hard.
Limescale is a persistent household challenge in Bletchley. At 201 mg/L, limescale forms in kettles within two to three weeks and monthly descaling is advisable. Combi-boiler heat exchangers accumulate deposits steadily — annual boiler servicing and an in-line scale inhibitor are recommended. Showerheads, taps, and shower screens develop regular deposits. Washing-up liquid lathers poorly. Using Calgon monthly in the washing machine and maintaining a regular descaling routine is important limescale management for Bletchley and Milton Keynes households.
Geology & Source: Supplied by Affinity Water from the Great Ouse and Jurassic Limestone catchment — Bletchley's Milton Keynes position on the Great Ouse flood plain draws on Affinity Water's Ouse valley and limestone supply blend from the Jurassic and Chalk country of south Bedfordshire, producing hard water at 201 mg/L (14.1°Clark).