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CITY · City of London
Thames Water
Water safety
Water safety| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Free Chlorinemg CL2/l | Not reported | 0.2 – 1 | — |
|---|
| Total Chlorinemg CL2/l | 0.62 | No limit | 0.12 |
|---|
General
General| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Hardnessmg CaCO3/l | 266 | 80 – 459 | 266 |
|---|
| pH | 7.86 | 6.5 – 9.5 | 7.86 |
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| TurbidityNTU | 0.11 | ≤ 4 | 0.011 |
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| ColorColor Units | 1.8 | ≤ 15 | 1.8 |
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| ConductivityμS / cm | 593 | ≤ 2,500 | 593 |
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| TDSmg/l | 379.5estimated | 0 – 1,199 | 379.5 |
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| OdorTON | 0 | ≤ 3 | 0 |
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| Alkalinitymg CaCO3/l | 205 | No limit | 205 |
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Pathogens
Pathogens| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| ClostridiumUFC/100ml | 0 | ≤ 0 | 0 |
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| eColiUFC/100ml | 0 | ≤ 0 | 0 |
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| BacteriasNMP/100ml | 0 | ≤ 0 | 0 |
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| EnterococcusUFC/100ml | 0 | ≤ 0 | 0 |
|---|
Chemical parameters
Chemical parameters| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Cyanide totalμg CN/l | 1.4 | ≤ 50 | 0.07 |
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| Fluoridemg F/l | 0.14 | ≤ 1.5 | 0.042 |
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| Mercuryμg Hg/l | 0.07 | ≤ 1 | 0.007 |
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| Nitritesmg NO2/l | 0.05 | ≤ 0.5 | 0.02 |
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| Nitratesmg NO3/l | 29.6 | ≤ 50 | 8.88 |
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Minerals
Minerals| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Magnesiummg/l | 4.5 | No limit | 4.5 |
|---|
| Chloridemg/l | 45 | ≤ 250 | 45 |
|---|
Metals
Metals| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Aluminiumμg/l | 8.2 | ≤ 200 | 8.2 |
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| Antimonyμg/l | 0.3 | ≤ 5 | 0.3 |
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| Arsenicμg/l | 1 | ≤ 10 | 0.5 |
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| Cadmiumμg/l | 0.4 | ≤ 5 | 0.4 |
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| Chromiumμg/l | 2.5 | ≤ 50 | 2.5 |
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| Copperμg/l | 50 | ≤ 2,000 | 2.5 |
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| Ironμg/l | 7 | ≤ 200 | 7 |
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| Manganeseμg/l | 0.6 | ≤ 50 | 0.6 |
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| Leadμg/l | 1.1 | ≤ 10 | 0.055 |
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| Nickelμg/l | 1 | ≤ 20 | 1 |
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| Seleniumμg/l | 0.5 | ≤ 10 | 0.5 |
|---|
| Sodiummg/l | 30 | ≤ 200 | 30 |
|---|
Chlorine by-products
Chlorine by-products| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Total Trichloroethyleneμg/l | 0 | ≤ 10 | 0 |
|---|
| Total Trihalomethanesμg/l | 14 | ≤ 100 | 0.7 |
|---|
Pesticides
Pesticides| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Total pesticidesug/L | 0.004 | ≤ 0.5 | 0.004 |
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Herbicides
Herbicides| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| D 2 4ug/L | 0.017 | ≤ 70 | 0.017 |
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| Atrazineug/L | 0.005 | ≤ 3 | 0.005 |
|---|
Perfluorinated chemicals
Perfluorinated chemicals| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Total PFASug/L | Not reported | ≤ 0.1 | — |
|---|
Other
Other| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Ammoniamg/l | 0.17 | No limit | 0.051 |
|---|
| Sulfatemg/l | 47 | No limit | 47 |
|---|
Data collected from the water company for your area. Quality ranges are based on WHO guidelines and the UK drinking water regulations.
4579 of 4579 tests within UK limits
