SCHEDULE 2PRESCRIBED CONCENTRATIONS OR VALUES
Item | Parameters | Units of Measurement | Concentration or Value (maximum unless otherwise stated) |
---|---|---|---|
1. | Colour | mg/1 Pt/Co scale | 20 |
2. | Turbidity (including suspended solids) | Formazin turbidity units | 4 |
3. | Odour (including hydrogen sulphide) | Dilution number | 3 at 25°C |
4. | Taste | Dilution number | 3 at 25°C |
5. | Temperature | °C | 25 |
6. | Hydrogen ion | pH value | 9.5 5.5 (minimum) |
7. | Sulphate | mg SO4/1 | 250 |
8. | Magnesium | mg Mg/1 | 50 |
9. | Sodium | mg Na/1 | 150 |
10. | Potassium | mg K/1 | 12 |
11. | Dry residues | mg/1 | 1500 (after drying at 180°C) |
12. | Nitrate | mg NO3/1 | 50 |
13. | Nitrite | mg NO2/1 | 0.1 |
14. | Ammonium (ammonia and ammonium ions) | mg NH4/1 | 0.5 |
15. | Kjeldahl nitrogen | mg N/1 | 1 |
16. | Oxidisability (permanganate value) | mg O2/1 | 5 |
17. | Total organic carbon | mg C/1 | No significant increase over that normally observed |
18. | Dissolved or emulsified hydrocarbons (after extraction with petroleum ether); mineral oils | μg/1 | 10 |
19. | Phenols | μg C6H5OH/1 | 0.5 |
20. | Surfactants | μg/1 (as lauryl sulphate) | 200 |
21. | Aluminium | μg Al/1 | 200 |
22. | Iron | μg Fe/1 | 200 |
23. | Manganese | μg Mn/1 | 50 |
24. | Copper | μg Cu/1 | 3000 |
25. | Zinc | μg Zn/1 | 5000 |
26. | Phosphorus | μg P/1 | 2200 |
27. | Fluoride | μg F/1 | 1500 |
28. | Silver | μg Ag/1 | 10(i) |
Note: (i) If silver is used in a water treatment process, 80 may be substituted for 10. |
Item | Parameters | Units of Measurement | Maximum Concentration |
---|---|---|---|
1. | Arsenic | μg As/1 | 50 |
2. | Cadmium | μg Cd/1 | 5 |
3. | Cyanide | μg CN/1 | 50 |
4. | Chromium | μg Cr/1 | 50 |
5. | Mercury | μg Hg/1 | 1 |
6. | Nickel | μg Ni/1 | 50 |
7. | Lead | μg Pb/1 | 50 |
8. | Antimony | μg Sb/1 | 10 |
9. | Selenium | μg Se/1 | 10 |
10. | Pesticides and related products:
| μg/1 | 0.1 |
| μg/1 | 0.5 | |
11. | Polycyclic aromatic hydrocarbons(ii) | μg/1 | 0.2 |
Note:
|
Item | Parameters | Units of Measurement | Maximum Concentration |
---|---|---|---|
1. | Total coliforms | number/100 ml | 0 |
2. | Faccal coliforms | number/100 ml | 0 |
3. | Faccal streptococci | number/100 ml | 0 |
4. | Sulphite-reducing clostridia | number/20 ml | ≤1(i) |
5. | Colony counts | number/1 ml at 22°C or 37°C | No significant increase over that normally observed |
Note: (i) Analysis by multiple tube method. |
Item | Parameters | Units of Measurement | Maximum Concentration or Value |
---|---|---|---|
1. | Conductivity | μS/cm | 1500 at 20°C |
2. | Chloride | mg Cl/1 | 400 |
3. | Calcium | mg Ca/1 | 250 |
4. | Substances extractable in chloroform | mg/1 dry residue | 1 |
5. | Boron | μg B/1 | 2000 |
6. | Barium | μg Ba/1 | 1000 |
7. | Benzo 3,4 pyrene | μg/1 | 10 |
8. | Tetrachloromethane | μg/1 | 3 |
9. | Trichloroethene | μg/1 | 30 |
10. | Tetrachlorothene | μg/1 | 10 |
Note: (i) See regulation 3(3)(d). |
Item | Parameters | Units of Measurement | Minimum Concentration(i) |
---|---|---|---|
1. | Total hardness | mg Ca/1 | 60 |
2. | Alkalinity | mg HCO3/1 | 30 |
Note: (i) See regulation 3(4). |