# The Surface Waters (Classification) Regulations 1989, Schedule: Criteria 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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Source: https://www.legislation.gov.uk/uksi/1989/1148/schedule (the official version)
Page: https://openlegislation.uk/surface-waters-classification-regulations-1989/schedule
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.