# The Surface Waters (Dangerous Substances) (Classification) Regulations 1997, Paragraph 2


Where samples are taken in accordance with regulation 4 above from more than one sampling point in relation to the waters in question, the requirement in paragraph 1(a) above must be satisfied in relation to the samples from each sampling point.
Table 1
(1)
(2)
Dangerous substance
Limit (in microgrammes per litre) (annual mean)
Arsenic
50
Atrazine and Simazine
2 (for the two substances in total)
Azinphos-methyl
0.01
Dichlorvos
0.001
Endosulphan
0.003
Fenitrothion
0.01
Malathion
0.01
Trifluralin
0.1
Table 2
(1)
(2)
Dangerous substance
Limit (in microgrammes per litre)
Tributyltin
0.02
Triphenyltin and its derivatives
0.02

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Source: https://www.legislation.gov.uk/uksi/1997/2560/schedule/1/paragraph/2 (the official version)
Page: https://openlegislation.uk/surface-waters-dangerous-substances-classification-regulations-1997/schedule-1/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.