11.—(1) Where a survey of any waters treated in accordance with regulation 6 as complying with any limit specified in Schedule 2 shows that the values obtained for any parameters are considerably superior to the relevant limits specified in Schedule 2 for that class of waters in relation to those parameters, the relevant water authority may, after consultation with SEPA, reduce the frequency of sampling of the waters in relation to those parameters.
(2) The relevant water authority may, after consultation with SEPA decide that regular sampling and analysis of waters classified under these Regulations is not needed if–
(a)the requirements of paragraph (1) above are satisfied in relation to the waters;
(b)there is no pollution of the waters;
(c)there is no risk of the quality of the waters deteriorating; and
(d)the quality of the waters is superior to the minimum required for waters classified as DW1.