Leeds Water Hardness & Quality Report (2026)
Water Hardness
6.3°Clark9°fH5°dH
Source
mixed
pH Level
7.5
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
185 mg/L
Est. Daily Cost
£0.20
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 Leeds, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Leeds | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.6 yrs | 8.5 yrs | -22% |
| Washing Machine | 10.3 yrs | 12 yrs | -14% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Leeds compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Leeds, Yorkshire and the Humber | 90 mg/L | 6.3° | 🟡 Moderately Hard | mixed |
| Bradford, Yorkshire and the Humber | 70 mg/L | 4.9° | 🟡 Moderately Hard | reservoir |
| Sheffield, Yorkshire and the Humber | 70 mg/L | 4.9° | 🟡 Moderately Hard | reservoir |
| Oldham, North West | 175.5 mg/L | 12.3° | 🟠 Hard | mixed |
| Manchester, North West | 25 mg/L | 1.8° | 🟢 Soft | reservoir |
National Benchmark
How Leeds compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Leeds | 90 mg/L | 🟡 Low |
| United Kingdom National Avg | 164 mg/L | 🟠 Moderate |
| Glasgow Top Rated | 15 mg/L | 🟢 None |
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What Makes Leeds's Water Unique?
Local geology and source profile
Leeds' water supply is managed by Yorkshire Water, drawing from a combination of Pennine upland reservoirs and river abstraction. Principal sources include the Fewston, Swinsty, and Eccup Reservoirs in the Washburn Valley and Harrogate area, supplemented by abstraction from the River Wharfe at Arthington, which serves the city's high-demand urban core. The Washburn reservoirs are fed by Pennine moorland catchments, while Wharfe abstraction introduces water that has flowed through more varied geological terrain. Water is treated at Yorkshire Water's treatment facilities in West Yorkshire before distribution to one of the UK's fastest-growing cities — Leeds has expanded rapidly and its supply infrastructure has evolved accordingly.
Leeds' hardness of 90 mg/L (6.3°Clark) reflects the mixed nature of its supply. The Pennine reservoir sources drain over Millstone Grit moorland — a calcium-poor geology producing soft water. However, the River Wharfe rises in the Pennines and flows through sections of Carboniferous Limestone in Wharfedale and the Yorkshire Dales before abstraction. This limestone contact adds calcium carbonate to the blend, raising the overall hardness above that of purely moorland-fed cities. The resulting water sits in the moderately soft classification of the Drinking Water Inspectorate (DWI).
Leeds households sit in a middle ground for limescale — less severe than cities in the East Midlands or south, but more noticeable than in Manchester or Glasgow. At 90 mg/L, limescale forms steadily in kettles, and descaling every six to eight weeks is sensible. Limescale build-up on taps and showerheads accumulates over several months. Combi-boiler efficiency is mildly affected by limescale over several years, and an annual service should check for heat exchanger deposits. Washing-up liquid lathers reasonably well at this hardness level. Regular use of a descaler for the kettle and adding Calgon to the washing machine monthly is sufficient protection for most Leeds homes.
Geology & Source: Supplied by Yorkshire Water from a blend of Pennine upland reservoirs and River Wharfe abstraction — the mixed surface and groundwater supply gives Leeds a moderately soft hardness of 90 mg/L (6.3°Clark), slightly higher than Sheffield owing to a greater contribution from limestone-influenced catchments.