Aylesbury Water Hardness & Quality Report (2026)
Water Hardness
19.6°Clark27.9°fH15.6°dH
Source
mixed
pH Level
8.4
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
804.8 mg/L
Est. Daily Cost
£0.63
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 Aylesbury, your appliances are currently losing 37% efficiency due to mineral buildup.
| Appliance | In Aylesbury | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3.3 yrs | 12 yrs | -73% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Aylesbury compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Aylesbury, South East | 279 mg/L | 19.6° | 🔴 Very Hard | mixed |
| Tring, East of England | 250.5 mg/L | 17.6° | 🔴 Very Hard | mixed |
| Thame, South East | 275 mg/L | 19.3° | 🔴 Very Hard | mixed |
| Leighton Buzzard, East of England | 184.5 mg/L | 12.9° | 🔴 Very Hard | mixed |
| Bletchley, South East | 201 mg/L | 14.1° | 🔴 Very Hard | mixed |
National Benchmark
How Aylesbury compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Aylesbury | 279 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 Aylesbury's Water Unique?
Local geology and source profile
Aylesbury, the county town of Buckinghamshire in the Vale of Aylesbury, is supplied by Affinity Water from the Chilterns Chalk Aquifer. Affinity Water operates licensed borehole abstractions on the chalk dip slope and chalk vale margins of the Chiltern Hills south and east of Aylesbury, including Wendover Springs (the town's celebrated natural spring source) and borehole fields at Stoke Mandeville and across the Vale. The Chilterns chalk gently dips northward beneath the Vale of Aylesbury clay plain, and Affinity Water accesses this chalk by deep borehole into the confined chalk aquifer beneath the vale. The chalk dissolves to very high calcium concentrations during the long underground flow path from the Chilterns recharge zone to the borehole abstractions, producing consistently very hard water.
Aylesbury's very hard water — 279 mg/L (19.6°Clark) — reflects the Chilterns Chalk Aquifer beneath the Vale of Aylesbury. The chalk here is a Cretaceous Upper and Middle Chalk sequence — the same formation that creates the Chilterns escarpment — dipping gently under the clay vale. Groundwater that enters the chalk at the Chilterns crest percolates slowly northward through the chalk over many years, dissolving very high calcium concentrations from the chalk matrix before being abstracted at Affinity Water's Vale of Aylesbury borehole sites. The Drinking Water Inspectorate (DWI) classifies this supply as very hard.
Limescale is a serious household challenge in Aylesbury. At 279 mg/L, limescale forms rapidly in kettles — a thick white crust within one to two weeks requiring fortnightly descaling. Combi-boiler heat exchangers face serious limescale risk; annual boiler servicing with limescale inspection and fitting a polyphosphate scale inhibitor are essential. Showerheads, taps, and shower screens develop heavy deposits. Washing-up liquid lathers very poorly. Aylesbury homeowners should consider a whole-house water softener for comprehensive limescale protection across appliances and plumbing.
Geology & Source: Supplied by Affinity Water from the Chilterns Chalk Aquifer — Aylesbury sits in the Vale of Aylesbury on the northern dip slope of the Chiltern Hills, where Affinity Water's chalk borehole network accesses Cretaceous Upper and Middle Chalk, producing very hard water at 279 mg/L (19.6°Clark).