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Hounslow, England
Hounslow
Your water is safe
We checked 22 things and found 1 worth knowing about
GoodYour water is safe
We checked 22 things and found 1 worth knowing about
GoodWater hardness: 266 mg/L (very hard)
Hard water — may cause limescale buildup in kettles and pipes
Hard water is costing your home money
Your water is very hard (266 mg/L) — find out if a softener is worth it
Tap water in W5 (Hounslow, Hounslow) is supplied by Thames Water and scored 8.7 out of 10 for safety based on 22 tested parameters. 1 contaminant exceeded recommended safe levels: Nitrite. Data is from 74 samples collected up to 2025-12-31, sourced from Thames Water via the Stream Water Data Portal.
Last sampled 2025-12-31 · 74 samples
Results from drinking water tests in Hounslow.
| Substance | Found | Safe Level | WHO Safe Level | Status |
|---|---|---|---|---|
| Nitrite | 0.6 mg/L | 0.5 mg/L | 3 mg/L | Over limit |
Source: Stream Water Data Portal
Limescale reduces boiler efficiency and shortens appliance life. Based on your water hardness (266 mg/L — very hard), a softener could save you £200+/year.
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Learn more about the water quality issues relevant to this area.
Rivers, groundwater and reservoirs near W5. This is environmental monitoring — not your tap water.
| Substance | Found | Safe Level | WHO Safe Level | Status |
|---|---|---|---|---|
| pH | 7.8 pH | — | — | Safe |
| Temperature | 6.91 °C | — | — | Safe |
| Ammonia | 0.244 mg/L | 0.5 mg/L | — | Safe |
| Nitrate | 2.1 mg/L | 50 mg/L | 50 mg/L | Safe |
| Phosphate | 0.29 mg/L | — | — | Safe |
| Dissolved Oxygen | 11 mg/L | — | — | Safe |
Source: Environment Agency
We'll email you when water quality data changes for W5.