# The Public Water Supplies (Scotland) Regulations 2014, Paragraph 2


(1) The following parameters (“Group A parameters”) must be monitored at least at the minimum frequencies determined in accordance with the table in paragraph 3:—
(a) Escherichia coli, enterococci, coliform bacteria, colony count 22 °C, colour, turbidity, taste, odour, hydrogen ion concentration (pH), and conductivity; and
(b) any other parameter, or other micro-organism, parasite or substance, (except radon, tritium and indicative dose) identified as relevant in the monitoring programme—
(i) by virtue of regulation 5(2) (as read with regulation 6(2)(a)); or
(ii) where relevant, through a risk assessment.
(2) Ammonium and nitrite must be included as Group A parameters, if chloramination is used.
(3) Aluminium and iron must be included as Group A parameters, if used as water treatment chemicals.
(4) Aluminium, iron and manganese must be included as Group A parameters, if the water in question originates from, or is influenced by surface waters.

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Source: https://www.legislation.gov.uk/ssi/2014/364/schedule/1A/paragraph/2n1 (the official version)
Page: https://openlegislation.uk/public-water-supplies-scotland-regulations-2014/schedule-1A/paragraph-2n1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.