# The Public Water Supplies (Scotland) Regulations 2014, Paragraph 2A (1) Each monitoring programme must include an operational monitoring programme that— (a) takes into account any parameter, or micro-organism, parasite or substance, identified as relevant— (i) by virtue of regulation 5(2), or (ii) through a risk assessment under regulation 30, (b) where appropriate, includes monitoring of parameters in accordance with sub-paragraphs (2) and (3), and (c) confirms the effectiveness of all measures in place to control risks to human health throughout the water supply chain (from the catchment area through abstraction, treatment and storage to distribution). (2) Except where turbidity is caused by iron and manganese in groundwater sources, the operational monitoring programme must include monitoring of the parameter turbidity at the treatment works in accordance with the reference values and frequencies in the following table— Operational parameter Reference value Minimum frequency of sampling and analysis Turbidity at the treatment works 0.3 NTU in 95% of samples and none to exceed 1 NTU Volume (m3) of water distributed or produced each day within a supply zone > 0 ≤ 1,000 Weekly > 1,000 ≤ 10,000 Daily > 10,000 Continuous (3) The operational monitoring programme must include monitoring of somatic coliphages in raw water in accordance with the following table— Operational parameter Reference value Unit Notes Somatic coliphages 50 (for raw water) PFU/100ml This parameter must be measured if the risk assessment under regulation 30 indicates that it is appropriate to do so. If it is found in raw water at concentrations > 50 PFU/100ml, it must be analysed after steps of the treatment train in order to determine log removal by the barriers in place and to assess whether the risk of a breakthrough of pathogenic viruses is sufficiently under control. (4) In this paragraph— “NTU” means Nephelometric Turbidity Unit, and “PFU” means Plaque Forming Unit. --- Source: https://www.legislation.gov.uk/ssi/2014/364/schedule/1A/paragraph/2A (the official version) Page: https://openlegislation.uk/public-water-supplies-scotland-regulations-2014/schedule-1A/paragraph-2A Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.