# The Surface Waters (Abstraction for Drinking Water) (Classification) Regulations 1996, Part II: MINIMUM ANNUAL FREQUENCY OF SAMPLING FOR EACH PARAMETER


Population served
Classification DW1
Classification DW2
Classification DW3
A
B
C
D
E
F
G
H
J
1 This column applies to the parameters—coloration, temperature and nitrates.
2 This column applies to the parameters—dissolved iron, copper, zinc, sulphates and phenols.
3 This column applies to the parameters—fluorides, arsenic, cadmium, total chromium, lead, selenium, mercury, barium, cyanide, dissolved or emulsified hydrocarbons, polycyclic aromatic hydrocarbons and total pesticides.
4 This column applies to the parameters—coloration, temperature, nitrates and ammonium.
5 This column applies to dissolved iron, zinc, sulphates and phenols.
6 This column applies to the parameters—arsenic, cadmium, total chromium, lead, selenium, mercury, barium, cyanide, dissolved or emulsified hydrocarbons, polycyclic aromatic hydrocarbons and total pesticides.
7 This column applies to the parameters—zinc, sulphates and phenols.
≤10,000
1
1
1
1
1
1
2
1
1
>10,000 to ≤30,000
1
1
1
2
1
1
3
1
1
>30,000 to ≤100,000
2
1
1
4
2
1
6
2
1
>100,000
3
2
1
8
4
1
12
4
1

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Source: https://www.legislation.gov.uk/uksi/1996/3001/schedule/2/part/II (the official version)
Page: https://openlegislation.uk/surface-waters-abstraction-for-drinking-water-classification-regulations-1996/schedule-2/part-II
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.