1.

Check monitoring The purpose of check monitoring is regularly to provide information on the organoleptic and microbiological quality of the water supplied for human consumption as well as information on the effectiveness of drinking-water treatment (particularly of disinfection) where it is used, in order to determine whether or not water intended for human consumption complies with the relevant parametric values laid down in this Directive. The following parameters must be subject to check monitoring. Member States may add other parameters to this list if they deem it appropriate. Aluminium (Note 1) Ammonium Colour Conductivity Clostridium perfringens (including spores) (Note 2) Escherichia coli (E. coli) Hydrogen ion concentration Iron (Note 1) Nitrite (Note 3) Odour Pseudomonas aeruginosa (Note 4) Taste Colony count 22 °C and 37 °C (Note 4) Coliform bacteria Turbidity Note 1: Necessary only when used as flocculant (1*). Note 2: Necessary only if the water originates from or is influenced by surface water (2*). Note 3: Necessary only when chloramination is used as a disinfectant (3*). Note 4: Necessary only in the case of water offered for sale in bottles or containers.

2 national measures recorded under this provision, in 1 form — sign in to view the analysis.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-29 · Text as adopted (Official Journal); later amendments are not incorporated in this text.