Daventry Water Hardness & Quality Report (2026)
Water Hardness
~150–199 mg/L
Moderately Hardestimated · not lab-verified
Source
mixed
pH Level
7.8
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
289.7 mg/L
Est. Daily Cost
£0.40
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 Daventry, your appliances are currently losing 23% efficiency due to mineral buildup.
| Appliance | In Daventry | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.5 yrs | 8.5 yrs | -24% |
| Washing Machine | 9.2 yrs | 12 yrs | -23% |
| Water Heater | 11.6 yrs | 15 yrs | -23% |
Regional Water Comparison
How Daventry compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Daventry, East Midlands | ≈ 150–199 mg/L | 12.3° | 🟡 Moderately Hard | mixed |
| Rugby, West Midlands | ≈ 200–300 mg/L | 18.7° | 🟠 Hard | mixed |
| Brackley, East Midlands | ≈ 200–300 mg/L | 11.8° | 🟠 Hard | mixed |
| Banbury, South East | ≈ 200–300 mg/L | 16.7° | 🟠 Hard | mixed |
| Northampton, East Midlands | ≈ 200–300 mg/L | 19.3° | 🟠 Hard | mixed |
National Benchmark
How Daventry compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Daventry | ≈ 150–199 mg/L | 🟡 Moderate |
| United Kingdom National Avg | 177 mg/L | 🟡 Moderate |
| Skipton Top Rated | 7.1 mg/L | 🟢 None |
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What Makes Daventry's Water Unique?
Local geology and source profile
Unfortunately, specific water quality data for Daventry could not be obtained from official utility reports. The available information pertains to the broader East Midlands region, offering general insights rather than precise details for Daventry residents. To provide a complete picture, access to Severn Trent Water's official website and their postcode-specific water quality checker would be necessary.
The water supplied to the Daventry area originates from a mixed source. This includes the Jurassic Oolitic Limestone Aquifer in Northamptonshire, specifically drawing from the Northampton Sand and Great Oolite formations. Additionally, chalk boreholes contribute to the supply, drawing from the region's ironstone and limestone geology.
This very hard water, measuring around 17.6° Clark, can lead to scale buildup in household appliances like kettles and water heaters, potentially shortening their lifespan. You might notice reduced lathering from soaps and detergents. Regular descaling of appliances and pipes can help manage the effects. For persistent issues, a water softener may be a worthwhile investment to protect your plumbing and improve cleaning efficiency.
Geology & Source: Jurassic Oolitic Limestone Aquifer; Northamptonshire ironstone and limestone produce very hard water
Other East Midlands Water Reports
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