| Population Served | Classification DW1 | Classification DW2 | Classification DW3 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| I1 | II2 | III3 | I1 | II2 | III3 | I1 | II2 | III3 | |
1 This column applies to the parameters −pH, coloration, total suspended solids, temperature, conductivity, odour, nitrates, chlorides, phosphates, chemical oxygen demand (COD), dissolved oxygen saturation rate, biochemical oxygen demand (BOD5) and ammonium. | |||||||||
2 This column applies to the parameters — dissolved iron, manganese, copper, zinc, sulphates, surfactants, phenols, nitrogen by the Kjeldahl method, total coliforms and faecal coliforms. | |||||||||
3 This column applies to the parameters — fluorides, boron, arsenic, cadmium, total chromium, lead, selenium, mercury, barium, cyanide, dissolved or emulsified hydrocarbons, polycyclic aromatic hydrocarbons, total pesticides, substances extractable by chloroform, faecal streptococci and salmonella. | |||||||||
| <10,000 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 1 |
| > 10,000 to ≤30,000 | 1 | 1 | 1 | 2 | 1 | 1 | 3 | 1 | 1 |
| >30,000 to ≤100,000 | 2 | 1 | 1 | 4 | 2 | 1 | 6 | 2 | 1 |
| >100,000 | 3 | 2 | 1 | 8 | 4 | 1 | 12 | 4 | 1 |