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


Population served
Classification DW1
Classification DW2
Classification DW3
I
II
III
I
II
III
I
II
III
1This column applies to the parameters – pH, coloration, total suspended solids, temperature, conductivity, odour, nitrates, chlorides, phosphates, chemical oxygen demand (COD), dissolved oxygen saturation rate, biochemical oxygen demand (BOD5) and ammonium.
2This column applies to the parameters – dissolved iron, manganese, copper, zinc, sulphates, surfactants, phenols, nitrogen by the Kjeldahl method, total coliforms and faecal coliforms.
3This column applies to the parameters – fluorides, boron, arsenic, cadmium, total chromium, lead, selenium, mercury, barium, cyanide, dissolved or emulsified hydrocarbons, polycyclic aromatic hydrocarbons, total pesticides, substances extractable with chloroform, faecal streptococci and salmonella.
≤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/1996/3047/schedule/3/part/II (the official version)
Page: https://openlegislation.uk/surface-waters-abstraction-for-drinking-water-classification-scotland-regulations-1996/schedule-3/part-II
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.