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The Private Water Supplies (Wales) Regulations 2010
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PART 2Indicator Parameters
TABLE C
Prescribed concentrations, values or states
| Parameters | Maximum concentration or value or state (unless otherwise stated) | Units of measurement |
|---|---|---|
(i) The water should not be aggressive. | ||
(ii) Excluding tritium, potassium-40, radon and radon decay products. | ||
(iii) Only in the case of surface water or groundwater that has been influenced by surface water. | ||
| Ammonium | 0.50 | mg/l |
| Chloride (i) | 250 | mg/l |
| Clostridium perfringens | 0 | Number/100ml |
| (including spores) | ||
| Coliform bacteria | 0 | Number/100ml (Number/250ml in the case of water put into bottles or containers) |
| Colony counts | No abnormal change | Number/ml at 22°C |
| No abnormal change | Number/ml at 37°C | |
| Conductivity (i) | 2500 | μS/cm at 20°C |
| Hydrogen ion | 9.5 (maximum) | pH value |
| 6.5 (minimum) (in the case of still water put into bottles or containers the minimum is 4.5) | pH value | |
| Sulphate (i) | 250 | mg/l |
| Total indicative dose (for radioactivity) (ii) | 0.10 | mSv/year |
| Total organic carbon (TOC) | No abnormal change | mgC/l |
| Tritium | ||
| (for radioactivity) | 100 | Bq/l |
| Turbidity(iii) | 1 | NTU |
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