Dumfries Water Hardness & Quality Report (2026)
Water Hardness
3.8°Clark5.4°fH3°dH
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
110.6 mg/L
Est. Daily Cost
£0.12
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 Dumfries, your appliances are currently losing 7% efficiency due to mineral buildup.
| Appliance | In Dumfries | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.8 yrs | 8.5 yrs | -8% |
| Washing Machine | 11.6 yrs | 12 yrs | -3% |
| Water Heater | 13.4 yrs | 15 yrs | -11% |
Regional Water Comparison
How Dumfries compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Dumfries, Scotland | 54 mg/L | 3.8° | 🟢 Soft | reservoir |
| Workington, North West | 149.5 mg/L | 10.5° | 🟠 Hard | mixed |
| Whitehaven, North West | 37.5 mg/L | 2.6° | 🟢 Soft | mixed |
| Carlisle, North West | 128 mg/L | 9° | 🟠 Hard | mixed |
| Carluke, Scotland | 66 mg/L | 4.6° | 🟡 Moderately Hard | reservoir |
National Benchmark
How Dumfries compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Dumfries | 54 mg/L | 🟢 None |
| United Kingdom National Avg | 183 mg/L | 🔴 High |
| Livingston Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Dumfries's Water Unique?
Local geology and source profile
Dumfries, the market town and principal town of Dumfries and Galloway on the River Nith, is supplied by Scottish Water from Loch Ken and the broader River Nith catchment supply network in Galloway. Loch Ken is a large freshwater loch formed behind a dam on the Water of Ken in the Galloway hills — fed by upland catchments draining the Silurian greywacke and Ordovician metasedimentary rocks of the Galloway Southern Uplands. The Nith rises in the Southern Uplands of East Ayrshire and flows through the Silurian and Ordovician moorland of upper Nithsdale before reaching Dumfries. These ancient, insoluble marine sedimentary rocks of the Southern Uplands contribute very low dissolved calcium. Scottish Water treats and distributes to Dumfries and the Nithsdale area.
Dumfries's soft water — 54 mg/L (3.8°Clark) — reflects the Silurian greywacke and Ordovician Southern Uplands catchment of the Galloway and Nith valley supply. The Southern Uplands geology is among the most calcium-free bedrock in Britain, and the TDS of 110.6 mg/L confirms very low total mineral content. The Drinking Water Quality Regulator for Scotland classifies this supply as soft.
Limescale is very minor in Dumfries. At 54 mg/L, limescale builds slowly and kettles need descaling every two to three months. Combi-boiler heat exchangers accumulate negligible deposits; annual servicing is routine. Showerheads and taps remain largely clear. Washing-up liquid lathers well with the soft Galloway supply. Limescale is not a significant domestic concern for Dumfries households on the Southern Uplands supply.
Geology & Source: Supplied by Scottish Water from Loch Ken and the River Nith catchment in Galloway — Dumfries's Nithsdale position on the Solway plain draws on Scottish Water's Galloway reservoir and Nith valley supply draining the Silurian greywacke and Ordovician Southern Uplands, producing soft water at 54 mg/L (3.8°Clark).