| Parameter | Parametric value | Unit |
|---|---|---|
(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. | ||
| Ammonium | 0.50 | mg/l |
| Chloride(1) | 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 |
| Conductivity(1) | 2500 | μS/cm at 20 °C |
| Hydrogen ion concentration(1) | ≥ 6.5 and ≤ 9.5 | pH units |
| Indicative Dose (for radioactivity)(2) (3) (4) | 0.10 | mSv |
| Sulphate(1) | 250 | mg/l |
| Radon (for radioactivity)(3) (6) | 100 | Bq/l |
| Total organic carbon | No abnormal change | mg/l |
| Tritium (for radioactivity)(3) (5) | 100 | Bq/l |
| Turbidity(7) | 1 | NTU |