SCHEDULE 1CRITERIA FOR CLASSIFICATION OF WATERS

Regulations 2, 3(1) and (3), 4(1), 5(3) and (4) and 6(1)

The limits set out below are maxima

No. in Annex II to 75/440/EEC

Parameters

Units

Limits

DW1

DW2

DW3

2

Coloration (after simple filtration)

mg/1 Pt Scale

20(O)

100(O)

200(O)

4

Temperature

°C

25(O)

25(O)

25(O)

7*

Nitrates

mg/l NO3

50(O)

50(O)

50(O)

8

Fluorides

mg/l F

1.5

10*

Dissolved iron

mg/l Fe

0.3

2

12

Copper

mg/l Cu

0.05(O)

13

Zinc

mg/l Zn

3

5

5

19

Arsenic

mg/l As

0.05

0.05

0.1

20

Cadmium

mg/l Cd

0.005

0.005

0.005

21

Total chromium

mg/l Cr

0.05

0.05

0.05

22

Lead

mg/l Pb

0.05

0.05

0.05

23

Selenium

mg/l Se

0.01

0.01

0.01

24

Mercury

mg/l Hg

0.001

0.001

0.001

25

Barium

mg/l Ba

0.1

1

1

26

Cyanide

mg/l CN

0.05

0.05

0.05

27

Sulphates

mg/l SO4

250

250(O)

250(O)

31

Phenols (phenol index) paranitraniline 4-aminoantipyrine

mg/l C6H5OH

0.001

0.005

0.1

32

Dissolved or emulsified hydrocarbons

mg/l

0.05

0.2

1

33

Polycyclic aromatic hydrocarbons

mg/l

0.0002

0.0002

0.001

34

Total pesticides (parathion, hexachlorocyclohexane, dieldrin)

mg/l

0.001

0.0025

0.005

39

Ammonium

mg/l NH4

1.5

4(O)

(O)

See regulation 4(1)(b).

*

See regulation 4(1)(d).