Part C Indicator parameters
United Kingdom
| Parameter | Parametric value | Unit | Notes |
|---|---|---|---|
| Aluminium | 200 | μg/l | |
| Ammonium | 0,50 | mg/l | |
| Chloride | 250 | mg/l | The water should not be corrosive. |
| Clostridium perfringens including spores | 0 | number/100 ml | This parameter shall be measured if the risk assessment indicates that it is appropriate to do so. |
| Colour | Acceptable to consumers and no abnormal change | ||
| Conductivity | 2 500 | μS cm-1 at 20 °C | The water should not be aggressive. |
| Hydrogen ion concentration | ≥ 6,5 and ≤ 9,5 | pH units | The water should not be aggressive. For still water put into bottles or containers, the minimum value may be reduced to 4,5 pH units. For water put into bottles or containers which is naturally rich in or artificially enriched with carbon dioxide, the minimum value may be lower. |
| Iron | 200 | μg/l | |
| Manganese | 50 | μg/l | |
| Odour | Acceptable to consumers and no abnormal change | ||
| Oxidisability | 5,0 | mg/l O2 | This parameter need not be measured if the parameter TOC is analysed. |
| Sulphate | 250 | mg/l | The water should not be corrosive. |
| Sodium | 200 | mg/l | |
| Taste | Acceptable to consumers and no abnormal change | ||
| Colony count 22o C | No abnormal change | ||
| Coliform bacteria | 0 | number/100 ml | For water put into bottles or containers, the unit is number/250 ml. |
| Total organic carbon (TOC) | No abnormal change | This parameter need not be measured for supplies of less than 10 000 m3 a day. | |
| Turbidity | Acceptable to consumers and no abnormal change | ||
| Water should not be aggressive or corrosive. This applies particularly to water undergoing treatment (demineralization, softening, membrane treatment, reverse osmosis, etc.). | |||
| Where water intended for human consumption is derived from treatment that significantly demineralizes or softens water, calcium and magnesium salts could be added to condition the water in order to reduce any possible negative health impact, as well as to reduce the corrosiveness or aggressivity of water and to improve taste. Minimum concentrations of calcium and magnesium or total dissolved solids in softened or demineralized water could be established taking into account the characteristics of water that enters those processes. | |||