2. Sampling frequencies Table 1. Minimum frequency of sampling and analysis for compliance …

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 m3/d = 16 samples for Group A parameters (four for the first 1 000 m3/d + 12 for additional 3 300 m3/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.