19.—(1) An enforcing authority must prepare and implement a monitoring programme for each supply zone (or part of a supply zone) in so far as the supply zone (or the part of it) relates to—
(a)water introduced into, and supplied through and from, a private water supply system to premises within the area of the enforcing authority; or
(b)water produced within the supply zone (or the part of it) which is supplied from a tanker or in bottles or containers to a point of compliance within the authority’s area.
(2) Each monitoring programme prepared by the enforcing authority must—
(a)meet its obligations under regulation 18;
(b)meet the minimum requirements in Parts A to D of schedule 3;
(c)accord with the monitoring requirements in Parts E and F of schedule 3; and
(d)comply with such other requirements as may be specified in directions given to the enforcing authority under regulation 36(1).
(3) The enforcing authority must—
(a)determine the sampling points (for the purposes of each monitoring programme); and
(b)ensure that these sampling points meet the relevant requirements in schedule 3.