# The Private Water Supplies (Wales) Regulations 2017, Paragraph 1: Sampling

Extent: E+W

(1) A local authority must undertake monitoring for Group A parameters in accordance with this Part.
(2) “Monitoring for Group A parameters” means sampling for each parameter listed in column 1 of Table 1 in the circumstances listed in the corresponding entry for that parameter in column 2 of that Table, in order to—
(a) determine whether or not water complies with the concentrations or values in Schedule 1;
(b) provide information on the organoleptic and microbiological quality of the water; and
(c) establish the effectiveness of the treatment of the water, including disinfection.
Table 1
Group A parameters
Parameter
Circumstances
Aluminium
If used as a water treatment chemical
Ammonium
If chloramination is used
Clostridium perfringens (including spores)
Where the water originates from, or is influenced by, surface waters
Coliform bacteria
In all supplies
Colony counts
In all supplies
Colour
In all supplies
Conductivity
In all supplies
Escherichia coli (E. coli)
In all supplies
Hydrogen ion concentration
In all supplies
Iron
If used as a water treatment chemical
Manganese
Where the water originates from, or is influenced by, surface waters
Nitrate
If chloramination is used
Nitrite
If chloramination is used
Odour
In all supplies
Pseudomonas aeruginosa
Only in the case of water in bottles or containers
Taste
In all supplies
Turbidity
In all supplies

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Source: https://www.legislation.gov.uk/wsi/2017/1041/schedule/2/paragraph/1 (the official version)
Page: https://openlegislation.uk/private-water-supplies-wales-regulations-2017/schedule-2/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.