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