28.—(1) As soon as reasonably practicable after a water undertaker or supplementary licensee has carried out a risk assessment or review of such assessment under regulation 27, it must submit to the Welsh Ministers a report of the assessment or review.
(2) The report must contain—
(a)a description of the methods used to carry out the assessment or review;
(b)where the assessment or review establishes that there is no significant risk of supplying water that could constitute a potential danger to human health or could be unwholesome, a statement confirming this; and
(c)where the assessment or review establishes that measures have been taken to remove a significant risk of supplying water that could constitute a potential danger to human health or could be unwholesome—
(i)monitoring data which verifies this; and
(ii)details of those measures.
(3) Where the assessment or review establishes that there is a significant risk of supplying water that could constitute a potential danger to human health or could be unwholesome, the report must—
(a)contain a full explanation including details of every property, organism or substance that has been identified as contributing to the risk; and
(b)specify the measures that the water undertaker or supplementary licensee—
(i)has made operational as at the date of the report; and
(ii)intends to make operational, to mitigate the risk.
(4) Where the Welsh Ministers have received a report which states that there is or has been a significant risk of supplying water that could constitute a potential danger to human health or could be unwholesome, they may, by notice served on the water undertaker or supplementary licensee, require the water undertaker or supplementary licensee—
(a)to maintain such specified measures for such period of time as the Welsh Ministers consider appropriate to mitigate the risk;
(b)to review, revise or make operational such specified measures by such date as the Welsh Ministers consider appropriate to mitigate the risk;
(c)to audit whether the measures have been effective by such means as may be specified;
(d)not to supply water for regulation 4(1) purposes from specified treatment works or supply systems, or not to so supply unless specified conditions are satisfied; and
(e)to give the Welsh Ministers such information as they may require to monitor progress towards mitigation of that risk.
(5) In paragraph (4), “specified” means specified in the notice served under that paragraph.
(6) The Welsh Ministers may, by notice served on the relevant water undertaker or supplementary licensee, revoke or amend a notice served under paragraph (4).