Part 2 Indicator Parameters
TABLE C
Prescribed concentrations and values
1 The water must not be aggressive. | ||
2 Excluding tritium, potassium-40, radon and radon decay products. | ||
3 Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out under Schedule 3 Part 1 to ensure efficacy of treatment. | ||
4 If the gross alpha activity exceeds 0.1Bq/l or the gross beta activity exceeds 1.0Bq/l analysis for specific radionuclides is required. | ||
5 If tritium concentration exceeds its parametric value an investigation (which may include analysis) of the presence of other artificial radionuclides must be carried out. | ||
6 Remedial action is deemed to be justified on radiological ground without further consideration, where radon exceeds 1,000Bq/l. | ||
7 Only in the case of surface water treatment where the parametric value should be strived for the water ex-treatment works. | ||
| Parameter | Parametric value | Unit |
|---|---|---|
| Ammonium | 0.50 | mg/l |
| Chloride1 | 250 | mg/l |
Clostridium perfringens (including spores) | 0 | number/100 ml |
| Coliform bacteria | 0 | Number/100ml |
| Colony count 22 °C | No abnormal change | number/1 ml |
| Conductivity1 | 2500 | μS/cm at 20 °C |
| Hydrogen ion concentration1 | ≥ 6.5 and ≤ 9.5 | pH units |
| Indicative Dose (for radioactivity)234 | 0.10 | mSv |
| Sulphate1 | 250 | mg/l |
| Radon (for radioactivity)36 | 100 | Bq/l |
| Total organic carbon | No abnormal change | mg/l |
| Tritium (for radioactivity)35 | 100 | Bq/l |
| Turbidity7 | 1 | NTU |