# The Surface Waters (Dangerous Substances) (Classification) Regulations 1992, Regulation 2: Classification of waters


(1) A system employing the classification DS3 is prescribed as a system of classification applying to relevant territorial waters, coastal waters and inland freshwaters.
(2) The criterion for the classification DS3 is that the annual mean concentration of each substance listed in column (1) of the Schedule in samples taken and tested in accordance with these Regulations must not exceed the relevant concentration specified in column (2) of the Schedule.

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Source: https://www.legislation.gov.uk/uksi/1992/337/regulation/2 (the official version)
Page: https://openlegislation.uk/surface-waters-dangerous-substances-classification-regulations-1992/regulation-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.