# Surface Waters (Dangerous Substances) (Classification) Regulations (Northern Ireland) 1998, Paragraph 1


Subject to paragraph 2, the criteria for the classification DS7 are that the annual mean concentration of each substance listed in column (1) of Table 9 in samples taken from the sampling point for the waters in question in accordance with regulation 4 does not exceed the relevant limit shown in column (2) of that Table.

---
Source: https://www.legislation.gov.uk/nisr/1998/397/schedule/7/paragraph/1 (the official version)
Page: https://openlegislation.uk/surface-waters-dangerous-substances-classification-regulations-northern-ireland-1998/schedule-7/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.