23.—(1) The enforcing authority must ensure that, where remedial action is taken in relation to water pursuant to regulation 21(c), consumers of the water and any other person affected, are—
(a)notified of the risk (if any) to human health and the remedial action taken; and
(b)advised of any additional precautionary measures that may be needed for the protection of human health.
(2) The duty to notify consumers in paragraph (1) does not apply if the enforcing authority confirms, by notice to the Drinking Water Quality Regulator for Scotland, that the remedial action was taken in response to a failure to meet a parametric value (other than a failure to meet a parametric value for radon, tritium or indicative dose) which it considers to be trivial.