Lymm Water Hardness & Quality Report (2026)
Water Hardness
10.7°Clark15.3°fH8.6°dH
Source
mixed
pH Level
7.8
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
417.2 mg/L
Est. Daily Cost
£0.35
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 Lymm, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Lymm | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.6 yrs | 8.5 yrs | -46% |
| Washing Machine | 7.9 yrs | 12 yrs | -34% |
| Water Heater | 9.5 yrs | 15 yrs | -37% |
Regional Water Comparison
How Lymm compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Lymm, North West | 153 mg/L | 10.7° | 🟠 Hard | mixed |
| Irlam, North West | 161 mg/L | 11.3° | 🟠 Hard | mixed |
| Warrington, North West | 103.5 mg/L | 7.3° | 🟡 Moderately Hard | mixed |
| Leigh, North West | 80.5 mg/L | 5.6° | 🟡 Moderately Hard | mixed |
| Knutsford, North West | 114.5 mg/L | 8° | 🟡 Moderately Hard | mixed |
National Benchmark
How Lymm compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Lymm | 153 mg/L | 🟠 Moderate |
| United Kingdom National Avg | 183 mg/L | 🔴 High |
| Livingston Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Lymm's Water Unique?
Local geology and source profile
United Utilities supplies Lymm, the charming Cheshire village in the Borough of Warrington — a conservation village of black-and-white timbered buildings set around Lymm Dam and the Bridgewater Canal, widely regarded as one of the most picturesque places in the north-west, popular with Cheshire commuters for its village atmosphere — from Llyn Vyrnwy upland reservoir in mid-Wales blended with Permo-Triassic Sandstone (Sherwood Sandstone) groundwater in the south Cheshire Warrington distribution zone, treated at Lostock Water Treatment Works near Northwich. At 153 mg/L (10.7°Clark), Lymm's water is moderately hard — harder than the soft Vyrnwy baseline — reflecting a significant Triassic Sherwood Sandstone and Mercia Mudstone groundwater fraction in the south Cheshire Triassic lowland supply blend.
Lymm sits on the Triassic Mercia Mudstone (Keuper Marl) plain of south Cheshire where United Utilities blends soft Llyn Vyrnwy Welsh upland reservoir supply with a proportion of Triassic Sandstone and Mercia Mudstone groundwater from the Cheshire Plain aquifer. The Triassic blend elevates hardness to 153 mg/L with TDS 417.2 mg/L — the somewhat elevated TDS/hardness ratio (2.73) consistent with a minor sulphate contribution from Triassic gypsum dissolution in the south Cheshire Mercia Mudstone supply zone.
At 153 mg/L, limescale is a consistent household concern in Lymm. Kettles benefit from descaling every four to six weeks. The combi-boiler should be fitted with a scale inhibitor and serviced annually. Washing-up liquid requires more product per wash than in softer areas. Taps and shower heads develop moderate white limescale deposits within two to three weeks; a monthly wipe with white vinegar or a proprietary descaling product is adequate to keep fittings in good condition. The moderately hard south Cheshire Triassic supply at Lymm is a domestic contrast to the village's idyllic rural charm — a practical reminder of the Triassic Sandstone lowland geology beneath the timbers and lock-keepers' cottages.
Geology & Source: Supplied by United Utilities from Llyn Vyrnwy reservoir blended with Triassic Sandstone groundwater in the south Cheshire Warrington distribution zone — treated at Lostock Water Treatment Works — produces moderately hard water at 153 mg/L (10.7°Clark).