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1. Member States shall ensure that any failure to meet the parametric values set in accordance with Article 5 is immediately investigated in order to identify the cause.

2. If, despite the measures taken to meet the obligations imposed in Article 4(1), water intended for human consumption does not meet the parametric values set in accordance with Article 5, and without prejudice to Article 6(2), the Member State concerned shall ensure that the necessary remedial action is taken as soon as possible to restore the quality of that water and shall give priority to its enforcement, having regard to, inter alia, the extent to which the relevant parametric value has been exceeded and the associated potential danger to human health. In the event of non-compliance with the parametric values set out in Part D of Annex I, remedial action shall include the measures set out in Article 10(3).

3. Regardless of whether any failure to comply with the parametric values has occurred, Member States shall ensure that any supply of water intended for human consumption which constitutes a potential danger to human health is prohibited or the use of such water restricted and that any other remedial action that is necessary to protect human health is taken. Member States shall consider a failure to meet the minimum requirements for parametric values set out in Parts A and B of Annex I as a potential danger to human health, except where the competent authority considers the non-compliance with the parametric value to be trivial.

4. In the cases described in paragraphs 2 and 3, where the non-compliance with the parametric values is considered to be a potential danger to human health, Member States shall as soon as possible take all of the following measures:

(a) notify all affected consumers of the potential danger to human health and its cause, of the exceedance of a parametric value and of the remedial actions taken, including prohibition or restriction of use or other action;

(b) give, and regularly update, the necessary advice to consumers on conditions of consumption and use of the water, taking particular account of population groups with increased water-related health risks; and (c) inform consumers once it has been established that there is no longer a potential danger to human health and inform them that the service has returned to normal.

5. The competent authorities or other relevant bodies shall decide what action under paragraph 3 is to be taken, bearing in mind the risks to human health which would be caused by an interruption of the supply or a restriction in the use of water intended for human consumption.

6. In the event of non-compliance with the parametric values or with the specifications set out in Part C of Annex I, Member States shall consider whether that non-compliance poses any risk to human health. They shall take remedial action to restore the quality of water intended for human consumption where that is necessary to protect human health.