ANNEX II

MONITORING TABLE A Parameters to be analysed 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. Audit monitoring The purpose of audit monitoring is to provide the information necessary to determine whether or not all of the Directive's parametric values are being complied with. All parameters set in accordance with Article 5(2) and (3) must be subject to audit monitoring unless it can be established by the competent authorities, for a period of time to be determined by them, that a parameter is not likely to be present in a given supply in concentrations which could lead to the risk of a breach of the relevant parametric value. This paragraph does not apply to the parameters for radioactivity, which, subject to Notes 8, 9 and 10 in Annex I, Part C, will be monitored in accordance with monitoring requirements adopted under Article 12. TABLE B1 Minimum frequency of sampling and analyses for water intended for human consumption supplied from a distribution network or from a tanker or used in a food-production undertaking Member States must take samples at the points of compliance as defined in Article 6(1) to ensure that water intended for human consumption meets the requirements of the Directive. However, in the case of a distribution network, a Member State may take samples within the supply zone or at the treatment works for particular parameters if it can be demonstrated that there would be no adverse change to the measured value of the parameters concerned. >TABLE> Note 1: A supply zone is a geographically defined area within which water intended for human consumption comes from one or more sources and within which water quality may be considered as being approximately uniform. Note 2: The volumes are calculated as averages taken over a calendar year. A Member State may use the number of inhabitants in a supply zone instead of the volume of water to determine the minimum frequency, assuming a water consumption of 200 l/day/capita. Note 3: In the event of intermittent short-term supply the monitoring frequency of water distributed by tankers is to be decided by the Member State concerned. Note 4: For the different parameters in Annex I, a Member State may reduce the number of samples specified in the table if: the values of the results obtained from samples taken during a period of at least two successive years are constant and significantly better than the limits laid down in Annex I, and no factor is likely to cause a deterioration of the quality of the water. The lowest frequency applied must not be less than 50 % of the number of samples specified in the table except in the particular case of note 6. Note 5: As far as possible, the number of samples should be distributed equally in time and location. Note 6: The frequency is to be decided by the Member State concerned. TABLE B2 Minimum frequency of sampling and analysis for water put into bottles or containers intended for sale >TABLE> (1*) In all other cases, the parameters are in the list for audit monitoring.

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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.