# The Private Water Supplies (Wales) Regulations 2017, Paragraph 4: Frequency of sampling

Extent: E+W

Sampling for Group B parameters must be carried out at the frequencies specified in Table 3.
Table 3
Sampling frequency for Group B parameters
Volume m3/day
Sampling frequency per year
≤10
1
˃ 10 ≤ 3,300
2
˃ 3,300 ≤ 6,600
3
˃ 6,600 ≤ 100,00
4
˃ 10,000 ≤ 100,000
3 + 1 for each 10,000 m3/day of the total volume (rounding up to the nearest multiple of 10,000 m3/day)
˃ 100,000
10 + 1 for each 25,000 m3/day of the total volume (rounding up to the
nearest multiple of 25,000 m3/day)

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Source: https://www.legislation.gov.uk/wsi/2017/1041/schedule/2/paragraph/4 (the official version)
Page: https://openlegislation.uk/private-water-supplies-wales-regulations-2017/schedule-2/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.