Question 27658 — water and sanitation

Summary

Mr. François-Michel Lambert draws the attention of the Minister of Solidarity and Health to the regulatory difficulties encountered by those involved in the treatment and reuse of gray water in the effective implementation of their installations in these respects. As lightly polluted domestic wastewater, gray water constitutes an abundant and reusable resource for multiple uses. In a general context of scarcity of water throughout the world and promotion of the circular economy, particularly in France, the treatment and reuse of gray water seems to fit perfectly into the strategy of saving and reusing water resources, essential for the preservation of the environment and particularly encouraged by article 69 of the law relating to the fight against waste and the circular economy, which complements the 6° of I of Article L. 211-1 of the Environmental Code, emphasizing that “the promotion of efficient, economical and sustainable use of water resources” involves “in particular through the development of the reuse of treated wastewater”. However, the treatment and reuse of gray water is only authorized in France on an experimental or exceptional basis, regardless of the final use of this treated water. GOOD that warning of possible health risks in certain circumstances, the opinion issued in 2015 by ANSES on "the health risks linked to the reuse of gray water for domestic uses" highlights three particular uses, which, under certain conditions, do not represent any specific danger: flushing toilets, washing exterior surfaces as well as watering green spaces. Despite This opening, projects considering the reuse of gray water for these three uses are faced with long administrative and regulatory procedures in order to obtain an exemption and come up against refusals from regional health agencies. Such a configuration obviously works to the disadvantage of the vital resource that is water and is opposed to national desires to preserve the environment and recycle waste. resources. He then asks him what he plans to implement to promote gray water treatment and reuse projects.

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