St. Ann's Water Hardness & Quality Report (2026)
Water Hardness
~200–300 mg/L
Hardestimated · not lab-verified
Source
mixed
pH Level
7.9
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
403.2 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 St. Ann's, your appliances are currently losing 33% efficiency due to mineral buildup.
| Appliance | In St. Ann's | 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 St. Ann's compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ St. Ann's, Greater London | ≈ 200–300 mg/L | 17.5° | 🟠 Hard | mixed |
| Harringay, Greater London | ≈ 300+ mg/L | 13.6° | 🔴 Very Hard | mixed |
| Seven Sisters, Greater London | ≈ 200–300 mg/L | 19° | 🟠 Hard | mixed |
| Stroud Green, Greater London | ≈ 300+ mg/L | 19.3° | 🔴 Very Hard | mixed |
| Stamford Hill, Greater London | ≈ 300+ mg/L | 22.3° | 🔴 Very Hard | mixed |
National Benchmark
How St. Ann's compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ St. Ann's | ≈ 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 St. Ann's's Water Unique?
Local geology and source profile
Thames Water Utilities Ltd supplies the St. Ann's area of Hackney, Greater London, drawing from a mix of sources. These include the River Thames, reservoirs in the Lee Valley, and the Chalk aquifer. Water undergoes treatment at facilities serving East London before reaching the roughly 15 million people in the region.
The London Basin geology, featuring Paleocene–Eocene London Clay over Upper Cretaceous Chalk, is key to the water's character. This Chalk aquifer, along with surface water from the Thames and River Lee, provides the supply. Minerals like calcium and magnesium carbonates, dissolved from these rock formations, naturally result in a hard water profile common to South East England.
Homeowners in St. Ann's can expect limescale buildup on appliances and fixtures. Kettles, showers, and bathroom tiles may develop scale, and dishwashers and washing machines might need regular descaling or a water softener to operate efficiently. While hard water isn't a health concern, it's primarily a maintenance issue. Thames Water ensures the water meets UK standards by monitoring various parameters, and residents can find detailed quality reports on the company's website.
Geology & Source: London Basin; Chalk and clay-derived calcium and magnesium carbonates create hard water
Other Greater London Water Reports
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