1.—(1) The local authority must ensure that each sample is—
(d)taken by a competent person using suitable equipment;
(e)representative of the water at the sampling point at the time of sampling;
(f)not contaminated in the course of being taken;
(g)kept at such temperature and in such conditions as will secure that there is no material change in what is to be measured; and
(h)analysed without delay by a competent person using suitable equipment.
(2) It must ensure that the sample is analysed using a system of analytical quality control.
(3) The system must be subjected to checking by a person who is—
(a)not under the control of either the analyst or the local authority; and
(b)approved by the Welsh Ministers for that purpose.