3.—(1) A local authority must undertake audit monitoring in accordance with this Part.
(2) Audit monitoring means sampling for each parameter listed in Schedule 1 (other than parameters already being sampled under check monitoring) in order to provide information necessary to determine whether or not the private supply satisfies each concentration, value or state specified in that Schedule and, if disinfection is used, to check that disinfection by-products are kept as low as possible without compromising the disinfection.
(3) The local authority may, for such time as it may decide, exclude a parameter from the audit monitoring of a private supply—
(a)if it considers that the parameter in question is unlikely to be present in the supply or system at a concentration or value that poses a risk of the private supply failing to meet the concentration, value or state specified in Schedule 1 in respect of that parameter;
(b)taking into account the findings of any risk assessment; and
(c)taking into account any guidance issued by the Secretary of State.
(4) It may monitor anything else identified in the risk assessment.