Division 2 Sampling frequencies
United Kingdom
| 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 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. | |||
| Volume of water distributed or produced each day within a supply zone(See Notes 1 and 2) m3 | Group A parameternumber of samples per year | Group B parameternumber of samples per year | |
|---|---|---|---|
| < 10 | > 0 (See Note 4) | > 0 (See Note 4) | |
| ≥ 10 | ≤ 100 | 2 | 1 (See Note 5) |
| > 100 | ≤ 1 000 | 4 | 1 |
| > 1 000 | ≤ 10 000 | 4 for the first 1 000 m3/d + 3 for each additional 1 000 m3/d and part thereof of the total volume (See Note 3) | 1 for the first 1 000 m3/d + 1 for each additional 4 500 m3/d and part thereof of the total volume (See Note 3) |
| > 10 000 | ≤ 100 000 | 3 for first 10 000 m3/d + 1 for each additional 10 000 m3/d and part thereof of the total volume (See Note 3) | |
| > 100 000 | 12 for first 100 000 m3/d + 1 for each additional 25 000 m3/d and part thereof of the total volume (See Note 3) | ||