Regulation 14 Sampling—further provisions
Where no standard number is specified in relation to a parameter listed in Schedule 2, a water undertaker shall take samples from water within a water supply zone in respect of that parameter as soon as it believes or has reasonable grounds for believing that–
the prescribed concentration or value in respect of that parameter has been exceeded or may be exceeded within the next three months within that zone; or
the prescribed concentration or value in respect of any other parameter has been exceeded or may be exceeded within the next three months within that zone; and the taking and analysis of samples in relation to the parameter first mentioned would assist in deciding whether and, if so, what remedial action should be taken.
A water undertaker shall take samples from water within a water supply zone in respect of any element, organism or substance, other than a parameter, as soon as it believes or has reasonable grounds for believing that that element, organism or substance, whether alone or in combination with a parameter or any other element, organism or substance may cause the supply within that zone to be a supply which does not satisfy the provisions of Part II of these Regulations or, where those provisions have been relaxed by an authorisation given under Part III, those provisions as so relaxed.