← Back to summarySee all parameters
Harpenden · St Albans
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 | 0.28 | No limit | 0.056 |
|---|
General
General| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| TemperatureC | 14.1 | No limit | 14.1 |
|---|
| Hardnessmg CaCO3/l | 320 | 80 – 459 | 320 |
|---|
| pH | 7 | 6.5 – 9.5 | 7 |
|---|
| TurbidityNTU | 0.1 | ≤ 4 | 0.01 |
|---|
| ColorColor Units | 2 | ≤ 15 | 2 |
|---|
| ConductivityμS / cm | 625 | ≤ 2,500 | 625 |
|---|
| TDSmg/l | 400estimated | 0 – 1,199 | 400 |
|---|
| OdorTON | 0 | ≤ 3 | 0 |
|---|
| Alkalinitymg CaCO3/l | 264.1 | No limit | 264.1 |
|---|
Pathogens
Pathogens| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| ClostridiumUFC/100ml | 0 | ≤ 0 | 0 |
|---|
| eColiUFC/100ml | 0 | ≤ 0 | 0 |
|---|
| 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 | 0.097 | ≤ 1.5 | 0.029 |
|---|
| Mercuryμg Hg/l | 0.02 | ≤ 1 | 0.002 |
|---|
| Nitritesmg NO2/l | 0.01 | ≤ 0.5 | 0.004 |
|---|
| Nitratesmg NO3/l | 28.6 | ≤ 50 | 8.58 |
|---|
Minerals
Minerals| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Calciummg/l | 128 | No limit | 128 |
|---|
| Chloridemg/l | 43 | ≤ 250 | 43 |
|---|
Metals
Metals| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Aluminiumμg/l | 2 | ≤ 200 | 2 |
|---|
| Antimonyμg/l | 0.03 | ≤ 5 | 0.03 |
|---|
| Arsenicμg/l | 0.2 | ≤ 10 | 0.1 |
|---|
| Cadmiumμg/l | 0.05 | ≤ 5 | 0.05 |
|---|
| Chromiumμg/l | 0.5 | ≤ 50 | 0.5 |
|---|
| Copperμg/l | 46 | ≤ 2,000 | 2.3 |
|---|
| Ironμg/l | 9 | ≤ 200 | 9 |
|---|
| Manganeseμg/l | 0.4 | ≤ 50 | 0.4 |
|---|
| Leadμg/l | 0.99 | ≤ 10 | 0.05 |
|---|
| Nickelμg/l | 1.4 | ≤ 20 | 1.4 |
|---|
| Seleniumμg/l | 0.4 | ≤ 10 | 0.4 |
|---|
| Sodiummg/l | 40.2 | ≤ 200 | 40.2 |
|---|
Chlorine by-products
Chlorine by-products| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Total Trichloroethyleneμg/l | 1.4 | ≤ 10 | 0.07 |
|---|
| Total Trihalomethanesμg/l | 2.65 | ≤ 100 | 0.13 |
|---|
Pesticides
Pesticides| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Total pesticidesug/L | 0.057 | ≤ 0.5 | 0.057 |
|---|
Herbicides
Herbicides| Parameter | Unfiltered tap water | Allowed range | Filtered |
|---|
| Atrazineug/L | 0.025 | ≤ 3 | 0.025 |
|---|
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 | 28 | No limit | 28 |
|---|
Data collected from the water company for your area. Quality ranges are based on WHO guidelines and the UK drinking water regulations.
612 of 612 tests within UK limits
