9.—(1) Paragraph (2) applies in the case of a private water supply (other than a supply specified in regulation 8) that—
(a)supplies an average daily volume of water of 10m3 or more, or
(b)supplies water as part of a commercial or public activity.
(2) Where this paragraph applies, the local authority must monitor for any parameter in Parts 1 and 2 of Schedule 1 in accordance with Schedule 2 and carry out any additional monitoring that the risk assessment shows to be necessary.