SCHEDULE 2INDICATOR PARAMETERS
Item | Parameters | Specification Concentration or Value (maximum unless otherwise stated) or State | Units of Measurement | Point of compliance |
|---|---|---|---|---|
1 | Ammonium | 0.50 | mgNH4/l | Consumers' taps |
2 | Chloride 1 | 250 | mgCl/l | Supply point3 |
3 | Clostridium perfringens (including spores) | 0 | Number/100 ml | Supply point3 |
4 | Coliform bacteria | 0 | Number/100 ml | Consumers' taps |
5 | Colony counts | No abnormal change | Number/1 ml at 22°C | Consumers' taps, service |
Number/1 ml at 37°C | Reservoirs and treatment works | |||
6 | Conductivity 1 | 2500 | μS/cm at 20°C | Supply point3 |
7 | Hydrogen ion | 9.5 | pHvalue | Consumers' taps |
6.5 (minimum) | pH value | |||
8 | Sulphate 1 | 250 | mgSO4/l | Supply point3 |
9 | Total indicative dose (for radioactivity) 2 | 0.10 | mSv/year | Supply point3 |
10 | Total organic carbon (TOC) | No abnormal change | mgC/l | Supply point3 |
11 | Tritium (for radioactivity) | 100 | Bq/l | Supply point3 |
12 | Turbidity | 1 | NTU | Treatment works |
Notes: | ||||
1 The water should not be aggressive. | ||||
2 Excluding tritium, potassium-40, radon and radon decay products. | ||||
3 May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | ||||