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The Surface Waters (Classification) Regulations 1989
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Regulation 3
SCHEDULECriteria for the classification of waters
The limits set out below are maxima
| (1) | (2) | (3) | (4) | (5) |
|---|---|---|---|---|
| No. in Annex II to 75/440/EEC | Parameters | DW1 | DW2 | DW3 |
Note (1) The value given is an upper limit set in relation to the mean annual temperature (high and low). | ||||
| 2 | Coloration (after simple filtration) mg/1 Pt Scale | 20 | 100 | 200 |
| 4 | Temperature °C | 25 | 25 | 25 |
| 7 | Nitrates mg/1 NO3 | 50 | 50 | 50 |
| 8(1) | Fluorides mg/1 F | 1·5 | ||
| 10 | Dissolved iron mg/1 Fe | 0·3 | 2 | |
| 12 | Copper mg/1 Cu | 0·05 | ||
| 13 | Zinc mg/1 Zn | 3 | 5 | 5 |
| 19 | Arsenic mg/1 As | 0·05 | 0·05 | 0·1 |
| 20 | Cadmium mg/1 Cd | 0·005 | 0·005 | 0·005 |
| 21 | Total chromium mg/1 Cr | 0·05 | 0·05 | 0·05 |
| 22 | Lead mg/1 Pb | 0·05 | 0·05 | 0·05 |
| 23 | Selenium mg/1 Se | 0·01 | 0·01 | 0·01 |
| 24 | Mercury mg/1 Hg | 0·001 | 0·001 | 0·001 |
| 25 | Barium mg/1 Ba | 0·1 | 1 | 1 |
| 26 | Cyanide mg/1 Cn | 0·05 | 0·05 | 0·05 |
| 27 | Sulphates mg/1 SO4 | 250 | 250 | 250 |
| 31 | Phenols (phenol index) paranitraniline 4 aminoantipyrine mg/1 C6H5OH | 0·001 | 0·005; | 0·1 |
| 32 | Dissolved or emulsified hydrocarbons (after extraction by petroleum ether) mg/1 | 0·05 | 0·2 | 1 |
| 33 | Polycyclic aromatic hydrocarbons mg/1 | 0·0002 | 0·0002 | 0·001 |
| 34 | Total pesticides (parathion, BHC, dieldrin) mg/1 | 0·001 | 0·0025 | 0·005 |
| 39 | Ammonia mg/1 NH4 | 1·5 | 4 | |
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