Monitoring and reviewE+W
44.—(1) The Welsh Ministers must establish a monitoring programme to assess the effectiveness of the measures imposed by these Regulations as a means of reducing or preventing water pollution from agricultural sources.
(2) At least every four years, the Welsh Ministers must review the effectiveness of the measures imposed by these Regulations as a means of reducing or preventing water pollution from agricultural sources and if necessary revise them.
(3) When carrying out a review under paragraph (2), the Welsh Ministers must take into account—
(a)available scientific and technical data, particularly with reference to respective nitrogen contributions originating from agricultural and other sources, and
(b)regional environmental conditions.