Saint Leonards-on-Sea Water Hardness & Quality Report (2026)
Water Hardness
~200–300 mg/L
Hardestimated · not lab-verified
Source
mixed
pH Level
8.2
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
401.1 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 Saint Leonards-on-Sea, your appliances are currently losing 33% efficiency due to mineral buildup.
| Appliance | In Saint Leonards-on-Sea | 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 Saint Leonards-on-Sea compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Saint Leonards-on-Sea, South East | ≈ 200–300 mg/L | 17.5° | 🟠 Hard | mixed |
| Hastings, South East | ≈ 150–200 mg/L | 18° | 🟡 Moderately Hard | mixed |
| Bexhill-on-Sea, South East | ≈ 300+ mg/L | 20.4° | 🔴 Very Hard | mixed |
| Eastbourne, South East | ≈ 200–300 mg/L | 19.5° | 🟠 Hard | mixed |
| Hailsham, South East | ≈ 300+ mg/L | 18.5° | 🔴 Very Hard | mixed |
National Benchmark
How Saint Leonards-on-Sea compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Saint Leonards-on-Sea | ≈ 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 Saint Leonards-on-Sea's Water Unique?
Local geology and source profile
South East Water supplies Saint Leonards-on-Sea in East Sussex, serving 2.2 million customers across Kent, Sussex, Surrey, Berkshire, and Hampshire. The water originates from groundwater sources in chalk and greensand aquifers, abstracted via boreholes. Key treatment works near Bexhill and Hastings process this raw groundwater through aeration, filtration, and disinfection before it reaches residents. Unlike some regions, this supply relies solely on underground sources, with no surface water reservoirs involved in its journey.
The watershed sits within the Wealden anticline and surrounding dip slopes of the Weald. Here, Cretaceous chalk and Lower Greensand formations create productive aquifers. As rainwater slowly percolates through these limestone and sandstone layers, it picks up minerals like calcium. This natural mineralization process, occurring without the softening effects of surface runoff, results in a characteristically hard water supply for the region.
Homeowners in Saint Leonards-on-Sea often notice limescale buildup in appliances like kettles, boilers, and washing machines. Hot water systems and taps tend to show the quickest scaling, impacting efficiency and potentially shortening the lifespan of fixtures. Regular descaling with common household solutions can help manage this, and many residents find installing magnetic conditioners or filters beneficial. For those in particularly hard water zones, a whole-house water softener is frequently recommended to better protect plumbing and improve how soaps lather.
Geology & Source: South East Water draws from chalk and greensand aquifers; chalk (limestone) and greensand (rich in calcium and glauconite) impart a hard character due to dissolved calcium and magnesium ions.
Other South East Water Reports
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