# The Surface Waters (Dangerous Substances) (Classification) Regulations 1998, 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)
4-Chloro-3-methyl-phenol
40
2-Chlorophenol
50
2,4-Dichlorophenol
20
2,4-D (ester)
1
(non-ester)
40
1,1,1-Trichloroethane
100
1,1,2-Trichloroethane
400
Bentazone
500
Benzene
30
Biphenyl
25
Chloronitrotoluenes
10
Demeton
0.5
Dimethoate
1
Linuron
2
Mecoprop
20
Naphthalene
10
Omethoate
0.01
Toluene
50
Triazaphos
0.005
Xylene
30

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Source: https://www.legislation.gov.uk/uksi/1998/389/schedule/1/paragraph/2 (the official version)
Page: https://openlegislation.uk/surface-waters-dangerous-substances-classification-regulations-1998/schedule-1/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.