# The Surface Waters (Dangerous Substances) (Classification) Regulations 1989, Schedule 1: CLASSIFICATION OF INLAND WATERS (DS1)


(1)
(2)
Substance
Concentration in microgrammes per litre (annual mean)
Aldrin, Dieldrin, Endrin and Isodrin
(i) 0·03 for the four substances in total;
(ii) 0·005 for endrin
Cadmium and its compounds
5 (total cadmium: both soluble and insoluble forms)
Carbon tetrachloride
12
Chloroform
12
DDT (all isomers)
0·025
para-para-DDT
0·01
Hexachlorobenzene
0·03
Hexachlorobutadiene
0·1
Hexachlorocyclohexane (all isomers)
0·1
Mercury and its compounds
1 (total mercury: both soluble and insoluble forms)
Pentachlorophenol and its compounds
2

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Source: https://www.legislation.gov.uk/uksi/1989/2286/schedule/1 (the official version)
Page: https://openlegislation.uk/surface-waters-dangerous-substances-classification-regulations-1989/schedule-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.