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Royston · North Hertfordshire
Affinity 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 | 0.38 | No limit | 0.076 |
|---|
General
General| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| TemperatureC | 14.2 | No limit | 14.2 |
|---|
| Hardnessmg CaCO3/l | 313 | 80 – 459 | 313 |
|---|
| pH | 7.1 | 6.5 – 9.5 | 7.1 |
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| TurbidityNTU | 0.1 | ≤ 4 | 0.01 |
|---|
| ColorColor Units | 2 | ≤ 15 | 2 |
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| ConductivityμS / cm | 518 | ≤ 2,500 | 518 |
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| TDSmg/l | 331.5estimated | 0 – 1,199 | 331.5 |
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| OdorTON | 0 | ≤ 3 | 0 |
|---|
| Alkalinitymg CaCO3/l | 232.9 | No limit | 232.9 |
|---|
Pathogens
Pathogens| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| ClostridiumUFC/100ml | 0 | ≤ 0 | 0 |
|---|
| eColiUFC/100ml | 0 | ≤ 0 | 0 |
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| BacteriasNMP/100ml | 0 | ≤ 0 | 0 |
|---|
| EnterococcusUFC/100ml | 0 | ≤ 0 | 0 |
|---|
Chemical parameters
Chemical parameters| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Cyanide totalμg CN/l | 6.5 | ≤ 50 | 0.33 |
|---|
| Fluoridemg F/l | 0.17 | ≤ 1.5 | 0.052 |
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| Mercuryμg Hg/l | 0.02 | ≤ 1 | 0.002 |
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| Nitritesmg NO2/l | 0.01 | ≤ 0.5 | 0.004 |
|---|
| Nitratesmg NO3/l | 31.6 | ≤ 50 | 9.48 |
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Minerals
Minerals| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Calciummg/l | 125 | No limit | 125 |
|---|
| Chloridemg/l | 20 | ≤ 250 | 20 |
|---|
Metals
Metals| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Aluminiumμg/l | 2 | ≤ 200 | 2 |
|---|
| Antimonyμg/l | 0.11 | ≤ 5 | 0.11 |
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| Arsenicμg/l | 0.2 | ≤ 10 | 0.1 |
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| Cadmiumμg/l | 0.05 | ≤ 5 | 0.05 |
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| Chromiumμg/l | 0.4 | ≤ 50 | 0.4 |
|---|
| Copperμg/l | 40 | ≤ 2,000 | 2 |
|---|
| Ironμg/l | 9 | ≤ 200 | 9 |
|---|
| Manganeseμg/l | 0.4 | ≤ 50 | 0.4 |
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| Leadμg/l | 0.83 | ≤ 10 | 0.042 |
|---|
| Nickelμg/l | 3.1 | ≤ 20 | 3.1 |
|---|
| Seleniumμg/l | 0.8 | ≤ 10 | 0.8 |
|---|
| Sodiummg/l | 10 | ≤ 200 | 10 |
|---|
Chlorine by-products
Chlorine by-products| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Total Trichloroethyleneμg/l | 0.7 | ≤ 10 | 0.035 |
|---|
| Total Trihalomethanesμg/l | 4.78 | ≤ 100 | 0.24 |
|---|
Pesticides
Pesticides| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Total pesticidesug/L | 0.01 | ≤ 0.5 | 0.01 |
|---|
Herbicides
Herbicides| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Atrazineug/L | 0.011 | ≤ 3 | 0.011 |
|---|
Perfluorinated chemicals
Perfluorinated chemicals| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Total PFASug/L | Not reported | ≤ 0.1 | — |
|---|
| PFAS 4ng/l | Not reported | No limit | — |
|---|
| PFAS 21ng/l | Not reported | No limit | — |
|---|
Other
Other| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Ammoniamg/l | 0.06 | No limit | 0.018 |
|---|
| Sulfatemg/l | 24 | No limit | 24 |
|---|
Data collected from the water company for your area. Quality ranges are based on WHO guidelines and the UK drinking water regulations.
463 of 463 tests within UK limits
