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LEWISHAM NORTH · Lewisham
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 | 0.61 | No limit | 0.12 |
|---|
General
General| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Hardnessmg CaCO3/l | 308 | 80 – 459 | 308 |
|---|
| pH | 7.38 | 6.5 – 9.5 | 7.38 |
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| TurbidityNTU | 0.1 | ≤ 4 | 0.01 |
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| ColorColor Units | 1.8 | ≤ 15 | 1.8 |
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| ConductivityμS / cm | 695 | ≤ 2,500 | 695 |
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| TDSmg/l | 444.8estimated | 0 – 1,199 | 444.8 |
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| OdorTON | 0 | ≤ 3 | 0 |
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| Alkalinitymg CaCO3/l | 221 | No limit | 221 |
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Pathogens
Pathogens| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| ClostridiumUFC/100ml | 0 | ≤ 0 | 0 |
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| eColiUFC/100ml | 10 | ≤ 0 | 1 |
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| BacteriasNMP/100ml | 24 | ≤ 0 | 2.4 |
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| EnterococcusUFC/100ml | 0 | ≤ 0 | 0 |
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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 | 0.16 | ≤ 1.5 | 0.048 |
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| Mercuryμg Hg/l | 0.07 | ≤ 1 | 0.007 |
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| Nitritesmg NO2/l | 0.02 | ≤ 0.5 | 0.008 |
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| Nitratesmg NO3/l | 22.8 | ≤ 50 | 6.84 |
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Minerals
Minerals| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Magnesiummg/l | 6.2 | No limit | 6.2 |
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| Chloridemg/l | 54 | ≤ 250 | 54 |
|---|
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 | 0.7 | ≤ 10 | 0.35 |
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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 | 130 | ≤ 2,000 | 6.5 |
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| Ironμg/l | 8 | ≤ 200 | 8 |
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| Manganeseμg/l | 0.6 | ≤ 50 | 0.6 |
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| Leadμg/l | 1 | ≤ 10 | 0.05 |
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| Nickelμg/l | 1.4 | ≤ 20 | 1.4 |
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| Seleniumμg/l | 3.7 | ≤ 10 | 3.7 |
|---|
| Sodiummg/l | 32 | ≤ 200 | 32 |
|---|
Chlorine by-products
Chlorine by-products| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Total Trichloroethyleneμg/l | 1 | ≤ 10 | 0.05 |
|---|
| Total Trihalomethanesμg/l | 7 | ≤ 100 | 0.35 |
|---|
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 | 0.07 | No limit | 0.021 |
|---|
| Sulfatemg/l | 85 | No limit | 85 |
|---|
Data collected from the water company for your area. Quality ranges are based on WHO guidelines and the UK drinking water regulations.
4945 of 4947 tests within UK limits
