Coventry Water Hardness & Quality Report (2026)
Water Hardness
~200–300 mg/L
Hardestimated · not lab-verified
Source
reservoir
pH Level
8.2
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
416.2 mg/L
Est. Daily Cost
£0.57
energy & soap waste
Source: DWI Data Portal · Updated 2026
0–99
mg/L
Soft
100–149
mg/L
Slightly Hard
150–199
mg/L
Moderately Hard
200–300
mg/L
Hard
300+
mg/L
Very Hard
Appliance Damage Report
In Coventry, your appliances are currently losing 33% efficiency due to mineral buildup.
| Appliance | In Coventry | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.7 yrs | 8.5 yrs | -33% |
| Washing Machine | 8 yrs | 12 yrs | -33% |
| Water Heater | 10 yrs | 15 yrs | -33% |
Regional Water Comparison
How Coventry compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Coventry, West Midlands | ≈ 200–300 mg/L | 17.5° | 🟠 Hard | reservoir |
| Bedworth, West Midlands | ≈ 300+ mg/L | 14.1° | 🔴 Very Hard | mixed |
| Kenilworth, West Midlands | 207.5 mg/L | 14.6° | 🟠 Hard | mixed |
| Royal Leamington Spa, West Midlands | ≈ 200–300 mg/L | 10.6° | 🟠 Hard | mixed |
| Nuneaton, West Midlands | 233.5 mg/L | 16.4° | 🟠 Hard | mixed |
National Benchmark
How Coventry compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Coventry | ≈ 200–300 mg/L | 🟠 High |
| United Kingdom National Avg | 177 mg/L | 🟡 Moderate |
| Skipton Top Rated | 7.1 mg/L | 🟢 None |
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What Makes Coventry's Water Unique?
Local geology and source profile
Severn Trent Water manages Coventry's water supply, drawing from a mix of surface water sources like rivers and reservoirs, as well as groundwater aquifers. Water treatment plants serving the area process water from local catchments before it reaches the approximately 300,000+ residents. This supply originates within the Midlands watershed.
The Coventry water supply area is geologically situated above Triassic sandstones, mudstones, and Carboniferous Coal Measures. Deeper aquifers in this region contain limestone and chalk formations. As groundwater travels through these mineral-rich strata, it dissolves calcium and magnesium carbonates, resulting in the characteristically hard water supply typical of the West Midlands.
This hard water can lead to noticeable scale buildup in appliances such as kettles and boilers, as well as within domestic pipework. Homeowners might observe white deposits in hot water systems, potentially reducing the efficiency of heating appliances. For those seeking to mitigate scale and extend the lifespan of their equipment, installing a water softener is often recommended, although some residents choose to live with the natural mineral content. Severn Trent Water confirms its compliance with UK drinking water regulations.
Geology & Source: Triassic sandstones and mudstones overlying Carboniferous Coal Measures; limestone and chalk formations contribute to hard water
Other West Midlands Water Reports
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