Chertsey Water Hardness & Quality Report (2026)
Water Hardness
301+ mg/L
Very Hardestimated · not lab-verified
Source
mixed
pH Level
8.4
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
530.6 mg/L
Est. Daily Cost
£0.85
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 Chertsey, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Chertsey | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.7 yrs | 8.5 yrs | -45% |
| Washing Machine | 6.6 yrs | 12 yrs | -45% |
| Water Heater | 8.3 yrs | 15 yrs | -45% |
Regional Water Comparison
How Chertsey compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Chertsey, South East | ≈ 301+ mg/L | 28.1° | 🔴 Very Hard | mixed |
| Addlestone, South East | 212.5 mg/L | 14.9° | 🟠 Hard | mixed |
| Staines, South East | ≈ 200–300 mg/L | 15.1° | 🟠 Hard | mixed |
| Weybridge, South East | ≈ 300+ mg/L | 14° | 🔴 Very Hard | mixed |
| Shepperton, South East | ≈ 200–300 mg/L | 18.8° | 🟠 Hard | mixed |
National Benchmark
How Chertsey compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Chertsey | ≈ 301+ mg/L | 🔴 Very High |
| United Kingdom National Avg | 177 mg/L | 🟡 Moderate |
| Skipton Top Rated | 7.1 mg/L | 🟢 None |
Bring Skipton-quality water to your Chertsey home
Shop water softeners on Amazon.co.uk →
What Makes Chertsey's Water Unique?
Local geology and source profile
Chertsey receives its water from Thames Water Utilities Ltd. The supply is a mix, drawing from the River Thames at Walton and from groundwater sourced from the North Downs Chalk aquifer in the north Surrey zone. All water undergoes treatment at the Walton Water Treatment Works before being distributed to residents.
The water's hardness is primarily influenced by its geological origins. The North Downs Chalk formation, a significant aquifer, is composed of chalk bedrock. This bedrock is rich in calcium carbonate, which dissolves into the groundwater. Consequently, water drawn from this chalk aquifer is characterized as very hard, registering at 17.6°Clark.
Residents in Chertsey likely experience the effects of very hard water, which can lead to scale buildup in appliances like kettles and water heaters, potentially shortening their lifespan. You might notice reduced lathering from soaps and detergents. To combat scale, regular descaling of appliances is recommended. Using a water softener is often a practical solution for households struggling with the impacts of very hard water on plumbing and daily chores.
Geology & Source: Chalk aquifer; high calcium carbonate content from chalk bedrock yields very hard water
Other South East Water Reports
Report an Issue
Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.
All reports are reviewed by our team. Thank you for supporting data quality!