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The Private Water Supplies Regulations 2009
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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 (including spores) | 0 | Number/100ml | ||
| Coliform bacteria | 0 | Number/100ml (Number/250 ml in the case of water put into bottles or containers) | ||
| Colony counts | No abnormal change No abnormal change | Number/ml at 22°C 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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