# The Water Supply (Water Quality) Regulations 2018, Paragraph


Note: This table and each table which follows it in this Part set out the annual sampling frequencies for all the substances and parameters comprising each of the groups to which they correspond at treatment works or supply points, those groups having been outlined in Part 1 of this Schedule. The frequencies are determined according to the volume of water supplied at each treatment works or supply point. The number of samples to be taken is the standard number specified in column 2, unless a notice varying this number has been issued under regulation 9.
Volume of water supplied m 3/day
Standard sampling frequency per year
<20
4
20-1,999
52
2,000-5,999
104
6,000-11,999
208
≥12,000
365
Table 12
Annual sampling frequencies for Group A3 parameters: treatment works or supply points
Volume of water supplied m 3/day
Standard sampling frequency per year
<20
2
20-999
4
1,000-1999
12
2,000-5,999
24
6,000-9,999
36
10,000-15,999
52
16,000-32,999
104
33,000-49,999
156
50,000-67,999
208
68,000-84,999
260
85,000-101,999
312
102,000-119,999
365
120,000-241,999
730
242,000-484,999
1,460
485,000-728,999
2,190
Table 13
Annual sampling frequencies for Group B2 parameters: treatment works or supply points
Volume of water supplied m 3/day
Standard sampling frequency per year
<20
1
20-999
4
1,000-49,999
8
50,000-89,999
12
90,000-299,999
24
300,000-649,999
36
≥650,000
48

---
Source: https://www.legislation.gov.uk/wsi/2018/647/schedule/3/part/3/paragraph/wrapper9n1 (the official version)
Page: https://openlegislation.uk/water-supply-water-quality-regulations-2018/schedule-3/part-3/paragraph-wrapper9n1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.