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: 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; 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 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.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-28 · Text as adopted (Official Journal); later amendments are not incorporated in this text.