5. Member States shall ensure that water suppliers and competent authorities have access to the information referred to in paragraphs 2 and 3. In particular, relevant water suppliers shall have access to the monitoring results obtained under point (c) of the first subparagraph of paragraph 2.
On the basis of the information referred to in paragraphs 2 and 3, Member States may:
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(a)
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require water suppliers to perform additional monitoring or treatment of certain parameters;
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(b)
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allow water suppliers to decrease the monitoring frequency of a parameter, or to remove a parameter from the list of parameters to be monitored by the water supplier in accordance with point (a) of Article 13(2), without being required to carry out a risk assessment of the supply system, provided that:
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(i)
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the parameter is not a core parameter within the meaning of point 1 of Part B of Annex II; and
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(ii)
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no factor that can be reasonably anticipated is likely to cause deterioration of the quality of water intended for human consumption.
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