Stoke-on-Trent Water Hardness & Quality Report (2026)
Water Hardness
4.2°Clark6°fH3.4°dH
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
110 mg/L
Est. Daily Cost
£0.14
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 Stoke-on-Trent, your appliances are currently losing 8% efficiency due to mineral buildup.
| Appliance | In Stoke-on-Trent | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.6 yrs | 8.5 yrs | -11% |
| Washing Machine | 11.4 yrs | 12 yrs | -5% |
| Water Heater | 13.2 yrs | 15 yrs | -12% |
Regional Water Comparison
How Stoke-on-Trent compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Stoke-on-Trent, West Midlands | 60 mg/L | 4.2° | 🟡 Moderately Hard | reservoir |
| Wolverhampton, West Midlands | 226 mg/L | 15.9° | 🔴 Very Hard | mixed |
| Manchester, North West | 25 mg/L | 1.8° | 🟢 Soft | reservoir |
| Oldham, North West | 175.5 mg/L | 12.3° | 🟠 Hard | mixed |
| Birmingham, West Midlands | 42.8 mg/L | 3° | 🟢 Soft | reservoir |
National Benchmark
How Stoke-on-Trent compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Stoke-on-Trent | 60 mg/L | 🟡 Low |
| United Kingdom National Avg | 164 mg/L | 🟠 Moderate |
| Glasgow Top Rated | 15 mg/L | 🟢 None |
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What Makes Stoke-on-Trent's Water Unique?
Local geology and source profile
Stoke-on-Trent's water supply is managed by Severn Trent Water, drawing on the same Welsh aqueduct infrastructure that supplies Birmingham and the broader West Midlands. The principal source is the Elan Valley Reservoir system in Radnorshire, mid-Wales — a cascade of six reservoirs collecting rainfall from ancient Welsh uplands, conveyed by aqueduct to the Frankley Water Treatment Works in Worcestershire. Stoke's supply is additionally augmented by local catchments and supplementary River Trent abstractions from the Midlands, introducing a modest increase in hardness above the pure Elan Valley baseline. Water is distributed north through Severn Trent's network to Stoke-on-Trent and the Staffordshire Potteries conurbation.
Stoke-on-Trent's hardness of 60 mg/L (4.2°Clark) reflects the dominant Elan Valley supply blended with Staffordshire local sources. The Elan catchment's Ordovician and Silurian impervious Welsh shales and mudstones produce extremely soft water, while the supplementary sources from the Triassic Bunter Sandstone of North Staffordshire and River Trent abstractions add a small calcium increment. The blended result sits at the low end of the soft band of the Drinking Water Inspectorate (DWI) classification — significantly softer than Wolverhampton to the south, which relies more heavily on local groundwater.
Limescale is a minor concern for Stoke-on-Trent residents. At 60 mg/L, limescale builds up slowly — kettles typically need descaling every two to three months and showerheads and taps show only modest white deposits over time. Combi-boiler heat exchangers in Stoke properties are under limited limescale pressure, supporting good boiler longevity without specialist treatment. Washing-up liquid lathers well at this softness level. The historic Potteries industry was itself partly shaped by the region's soft water, which was ideal for the precision glazing processes of the ceramic trade — an interesting local legacy of water chemistry that continues to benefit today's residents.
Geology & Source: Supplied by Severn Trent Water from the Elan Valley Reservoirs in mid-Wales and River Trent supplementary sources — the predominantly Welsh upland catchment supply gives Stoke-on-Trent relatively soft water at 60 mg/L (4.2°Clark), though local blending adds modest hardness above Birmingham's level.