Schedule 2 INDICATOR PARAMETERS
1 The water should not be aggressive. | ||||
2 Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. | ||||
3 Remedial action may be taken by the Welsh Ministers on radiological protection grounds without further consideration and deemed to be justified where radon concentrates exceed 1,000 Bq/1. | ||||
4 If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides is required. | ||||
5 May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | ||||
| Item Parameters | Specification | Concentration or Value (maximum unless otherwise stated) or State | Units of Measurement | Point of compliance |
| 1 | Ammonium | 0.50 | μgAl/l | Consumers' taps |
| 2 | Chloride 1 | 250 | mgCl/l | Supply point 5 |
| 3 | Clostridium perfringens (including spores) | 0 | Number/100 ml | Supply point 5 |
| 4 | Coliform bacteria | 0 | Number/100 ml | Consumers' taps |
| 5 | Colony counts | No abnormal change | Number/1 ml at 22°C | Consumers' taps, service reservoirs and treatment works |
| 6 | Conductivity 1 | 2500 | μS/cm at 20°C | Supply point 5 |
| 7 | Hydrogen ion | 9.5 | pHvalue | Consumers' taps |
| 6.5 (minimum) | ||||
| 8 | Indicative dose 2 | 0.10 | mSv | Supply point 5 |
| (a) gross alpha | 0.1 | Bq/l | Supply point 5 | |
| (b) gross beta | 1 | Bq/l | Supply point 5 | |
| 9 | Radon 3 | 100 | Bq/l | Supply point |
| 10 | Sulphate 1 | 250 | mgSO4/l | Supply point 5 |
| 11 | Total organic carbon (TOC) | No abnormal change | mgC/l | Supply point |
| 12 | Tritium (for radioactivity) 4 | 100 | Bq/l | Supply point |
| 13 | Turbidity | 1 | NTU | Treatment works |
| Notes: | ||||