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.