Regulations 2 and 4
Notes: {s011} The water should not be aggressive. {s012} Excluding tritium, potassium – 40, radon and radon decay products. {s013} May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | ||||
| Item | Parameters | Concentration or Value (maximum) or State | Units of Measurement | Point of monitoring |
|---|---|---|---|---|
| 1. | Ammonium | 0.50 | mgNH4/l | consumers’ taps |
| 2. | Chloride {s011} | 250 | mgCl/l | supply point {s013} |
| 3. | Clostridium perfringens (including spores) | 0 | Number/100 ml | supply point {s013} |
| 4. | Coliform bacteria | 0 | Number/100ml | consumers’ taps |
| 5. | Colony count | No abnormal change | Number/1 ml at 22°C | consumers’ taps |
| Number/1 ml at 37°C | service reservoirs and treatment works | |||
| 6. | Conductivity {s011} | 2500 | μS/cm at 20°C | supply point {s013} |
| 7. | Sulphate {s011} | 250 | mgSO4/l | supply point {s013} |
| 8. | Total indicative dose (for radioactivity) {s012} | 0.10 | mSv/year | supply point {s013} |
| 9. | Total organic carbon (TOC) | No abnormal change | mgC/l | supply point {s013} |
| 10. | Tritium (for radioactivity) | 100 | Bq/l | supply point {s013} |
| 11. | Turbidity | 1 | NTU | treatment works |