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The Surface Waters (Abstraction for Drinking Water) (Classification) Regulations (Northern Ireland) 1996

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Part IIMinimum Annual Frequency of Sampling for each Parameter

Population ServedClassification DW1Classification DW2Classification DW3

This 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.


This column applies to the parameters — dissolved iron, manganese, copper, zinc, sulphates, surfactants, phenols, nitrogen by the Kjeldahl method, total coliforms and faecal coliforms.


This 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 by chloroform, faecal streptococci and salmonella.

> 10,000 to ≤30,000111211311
>30,000 to ≤100,000211421621

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