Constituent | Class 0 | Class I | Class II | Class III |
Electrical conductivity (mS/cm) | 0 - 0.7 | 0.7 - 1.50 | 1.50 - 3.70 | > 3.70 |
pH | 6.0 - 9.0 | 5 - 6 or 9 - 9.5 | 4 - 5 or 9.5 - 10 | < 4 or > 10 |
Nitrate (mg/L) | 0 - 6 | 6 - 10 | 10 - 20 | 20 |
Sulphate (mg/L) | 0 - 200 | 200 - 400 | 400 - 600 | > 600 |
Chloride (mg/L) | 0 - 100 | 100 - 200 | 200 - 600 | > 600 |
Iron (mg/L) | 0 - 0.1 | 0.1 - 0.2 | 0.2 - 2.0 | > 2.0 |
Manganese (mg/L) | 0 - 0.05 | 0.05 - 0.1 | 0.1 - 1.0 | > 1.0 |
Cadmium (mg/L) | 0 - 0.005 | 0.005 - 0.01 | 0.01 - 0.02 | > 0.02 |
Zinc (mg/L) | 0 - 3.0 | 3.0 - 5.0 | 5.0 - 10.0 | > 10.0 |
Magnesium (mg/L) | 0 - 30 | 30 - 70 | 70 - 100 | > 100 |
Sodium (mg/L) | 0 - 100 | 100 - 200 | 200 - 400 | > 400 |