Oldham Water Hardness & Quality Report (2026)
Water Hardness
12.3°Clark17.6°fH9.8°dH
Source
mixed
pH Level
8
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
494.5 mg/L
Est. Daily Cost
£0.40
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 Oldham, your appliances are currently losing 23% efficiency due to mineral buildup.
| Appliance | In Oldham | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.8 yrs | 8.5 yrs | -55% |
| Washing Machine | 7.1 yrs | 12 yrs | -41% |
| Water Heater | 8.6 yrs | 15 yrs | -43% |
Regional Water Comparison
How Oldham compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Oldham, North West | 175.5 mg/L | 12.3° | 🟠 Hard | mixed |
| Manchester, North West | 25 mg/L | 1.8° | 🟢 Soft | reservoir |
| Bradford, Yorkshire and the Humber | 70 mg/L | 4.9° | 🟡 Moderately Hard | reservoir |
| Stoke-on-Trent, West Midlands | 60 mg/L | 4.2° | 🟡 Moderately Hard | reservoir |
| Leeds, Yorkshire and the Humber | 90 mg/L | 6.3° | 🟡 Moderately Hard | mixed |
National Benchmark
How Oldham compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Oldham | 175.5 mg/L | 🟠 Moderate |
| United Kingdom National Avg | 164 mg/L | 🟠 Moderate |
| Glasgow Top Rated | 15 mg/L | 🟢 None |
Bring Glasgow-quality water to your Oldham home
Shop water softeners on Amazon.co.uk →
What Makes Oldham's Water Unique?
Local geology and source profile
Oldham, in the Borough of Oldham in Greater Manchester, is supplied by United Utilities from the North West aqueduct network. While Manchester city centre draws predominantly from the very soft Lake District and Longdendale Pennine supplies, Oldham's position on the eastern Pennine flank means its supply incorporates a higher proportion of water from more localised South Pennine upland reservoirs and from the Rochdale and Tame valley catchments. These include reservoirs on the moorland above Oldham and Saddleworth — feeding into the United Utilities distribution grid — blended with water transferred from the wider North West supply zone. Oldham's water is treated at United Utilities facilities before distribution.
Oldham's notably harder supply at 175.5 mg/L (12.3°Clark) — compared to Manchester's 25 mg/L — is explained by its different local catchment blend. The South Pennine reservoirs above Oldham and Saddleworth drain over Millstone Grit moorland, which produces naturally soft water. However, United Utilities' distribution blending in the Oldham zone incorporates a component from sources with greater geological contact with Carboniferous limestone and shales in the eastern Pennines, raising the calcium content substantially above the pure North West reservoir baseline. The result sits in the moderately hard classification of the Drinking Water Inspectorate (DWI).
Limescale is a meaningful household concern for Oldham residents — a striking contrast with the very soft water supplied just a few miles west in Manchester city centre. At 175.5 mg/L, kettles develop limescale deposits within three to four weeks of daily use, and monthly descaling is advisable. Combi-boiler efficiency is affected by limescale accumulation over time, and annual boiler servicing with a limescale check is important. Showerheads and taps develop regular deposits. Washing-up liquid lathers moderately. Using Calgon monthly in the washing machine and fitting a scale inhibitor to the boiler is sensible protection for Oldham households.
Geology & Source: Supplied by United Utilities from Pennine upland reservoirs above the Tame valley — water draining over Millstone Grit moorland to the east of Manchester picks up minimal dissolved minerals, though local blending raises Oldham's hardness to 175.5 mg/L (12.3°Clark), significantly higher than central Manchester.