2.

Sampling frequencies Table 1. Minimum frequency of sampling and analysis for compliance monitoring 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 the water quality can be considered as being approximately uniform. Note 2: The volumes are calculated as averages taken over a calendar year. The number of inhabitants in a supply zone may be used instead of the volume of water to determine the minimum frequency, assuming water consumption of 200 l/(day*capita). Note 3: The frequency indicated is calculated as follows: e.g. 4 300 m^(3)/d = 16 samples for Group A parameters (four for the first 1 000 m^(3)/d + 12 for additional 3 300 m^(3)/d). Note 4: For water suppliers, where an exemption has not been granted under point (b) of Article 3(3), Member States shall lay down the minimum sampling frequency for parameters of Groups A and B, provided that core parameters are monitored at least once per year. Note 5: Member States may reduce the sampling frequency, provided that all parameters set in accordance with Article 5 are monitored at least once every six years and are monitored in cases where a new water source is integrated into the water supply system or changes to that system, as a result of which a potentially adverse effect on the quality of water is to be expected, are made. Volume of water distributed or produced each day within a supply zone (See Notes 1 and 2) m^(3) Group A parameter number of samples per year Group B parameter number of samples per year < 10 > 0 (See Note 4) > 0 (See Note 4) ≥ 10 ≤ 100 2 1 (See Note 5) > 100 ≤ 1000 4 1 > 1000 ≤ 10000 4 for the first 1 000 m^(3)/d + 3 for each additional 1 000 m^(3)/d and part thereof of the total volume (See Note 3) 1 for the first 1 000 m^(3)/d + 1 for each additional 4 500 m^(3)/d and part thereof of the total volume (See Note 3) > 10000 ≤ 100000 3 for first 10 000 m^(3)/d + 1 for each additional 10 000 m^(3)/d and part thereof of the total volume (See Note 3) > 100000 12 for first 100 000 m^(3)/d + 1 for each additional 25 000 m^(3)/d and part thereof of the total volume (See Note 3)

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Source: EUR-Lex (Cellar) · retrieved 2026-10-28 · Text as adopted (Official Journal); later amendments are not incorporated in this text.