Regulation 21 Investigations: Schedule 1 parameters
Subject to paragraph (3), where a water undertaker has reason to believe that water supplied by it for regulation 5(1) purposes—
fails, or is likely to fail, to satisfy a requirement of regulation 5(3); or
is to be regarded as unwholesome by virtue of regulation 5(5); or
if regulation 5(7) were ignored, would be regarded as unwholesome by virtue of regulation 5(6),
the water undertaker must immediately take such steps as are necessary to identify the matters specified in paragraph (2).
The matters referred to in paragraph (1) are—
the cause and extent of the failure or, as the case may be, the apprehended failure;
the Schedule 1 parameters in respect of which the prescribed concentration or value has not been, or is unlikely to be, achieved; and
in relation to each parameter so identified, whether the failure, or apprehended failure, to achieve the prescribed concentration or value is attributable—
to the domestic distribution system;
to the maintenance of that system; or
to neither of those matters.
Where a departure has been authorised under this Part—
paragraph (1) must apply only in respect of the Schedule 1 parameters (if any) that are not specified in the authorisation; and
if a water undertaker has reason to believe that water supplied by it for regulation 5(1) purposes fails, or is likely to fail, to satisfy the concentration or value required by the authorisation in relation to any Schedule 1 parameter, a water undertaker must immediately take such steps as are necessary to identify the matters specified in paragraph (4).
The matters referred to in paragraph (3) are—
the cause and extent of the failure or, as the case may be, the apprehended failure;
the Schedule 1 parameters in respect of which the required concentration or value has not been, or is unlikely to be, achieved; and
in relation to each parameter so identified, whether the failure, or apprehended failure, to achieve that concentration or value is attributable—
to the domestic distribution system;
to the maintenance of that system; or
to neither of those matters.
After the matters specified in paragraphs (2) or (4), as the case may be, have been identified, the water undertaker must immediately notify the Department—
of those matters;
in relation to each parameter identified in accordance with paragraphs (2)(b) or (4)(b), whether it is the opinion of the water undertaker that a failure in respect of that parameter is likely to recur; and
of the action (if any) taken by the water undertaker in relation to a failure which is attributable to the domestic distribution system or the maintenance of that system.
Where a water undertaker has identified a failure attributable to the domestic distribution system or to the maintenance of that system, it must, at the same time as notification is given under paragraph (5)—
by notice in writing to those of its consumers—
to whom it supplies water for regulation 5(1) purposes; and
who are likely to be affected by the failure,
inform them of the nature of the failure and provide details of the steps (if any) that, in the opinion of the water undertaker, it is necessary or desirable for those consumers to take in the interests of their health; and
send a copy of that notice to the Department and to each appropriate district council.
Where such a failure as is mentioned in paragraph (1) relates to the copper or lead parameter, the water undertaker must, as soon as reasonably practicable after the occurrence, modify or replace such of its pipes and their associated fittings as it knows or has reason to believe have the potential for contributing to copper or lead in the water supplied to the premises, so as to eliminate that potential (whether or not the presence of copper or lead in those pipes contributed to the failure).