September 2017. For lead, the WHO recommended to retain the current parametric value, but noted that concentrations should be as low as reasonably practical. Therefore, the current value of 10 µg/l can be retained for 15 years after the entry into force of this Directive. After this transitional period at the latest, the parametric value should be 5 µg/l. In addition, since existing lead pipes in houses and buildings are a persisting issue for which Member States do not always have the necessary authority to impose the replacement of lead pipes, the value of 5 µg/l should remain aspirational when it comes to obligations related to the domestic distribution systems. However, for all new materials in contact with drinking water, regardless of whether they are to be used in supply or domestic distribution systems, to be authorised in accordance with this Directive, the value of 5 µg/l should apply at the tap.
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Sources: Directive on the Quality of Water Intended for Human Consumption (Recast), Directive on the Quality of Water Intended for Human Consumption (Recast)