Public inquiry on sanitation zoning in Grand Paris Seine & Oise

Residents of Achères, Conflans-Sainte-Honorine, and Les Mureaux are invited to participate in the consultation until December 5, 2026.

Generic image of a sanitation infrastructure in a French urban area.
AI

Generic image of a sanitation infrastructure in a French urban area.

The urban community Grand Paris Seine & Oise (GPS&O) is launching a public inquiry on the draft sanitation zoning plan for wastewater and rainwater in the municipalities of Achères, Conflans-Sainte-Honorine, and Les Mureaux. The consultation runs from November 5 to December 5, 2026.

This public inquiry, which began on Thursday, November 5, 2026, offers residents the opportunity to consult the file and submit their observations regarding wastewater and rainwater management. The aim is to gather residents' feedback before the plan's finalization.
Two public meetings are organized in Achères, allowing citizens to meet the inquiry commissioner, Mr. Michel Riou. These meetings will be held at the Centre Technique Municipal d’Achères (urban planning department) on Tuesday, November 10, 2026, from 3:45 PM to 5:45 PM, and on Wednesday, November 25, 2026, from 3:45 PM to 5:45 PM. The address is Centre Technique Municipal – 9 avenue Jacques Chirac, 78260 Achères.
The inquiry file is physically accessible at the Centre Technique Municipal d’Achères, urban planning department, during opening hours (Mondays, Tuesdays, Wednesdays, and Fridays, from 8:30 AM to 12 PM and 1:30 PM to 5:45 PM). Residents can also submit their observations online via the dedicated digital register, available at https://www.registre-numerique.fr/zonage-assainissement-yvelines.
Observations can also be sent by email to zonage-assainissement-yvelines@mail.registre-numerique.fr. The public inquiry will conclude on Saturday, December 5, 2026, at 1 PM.
Based on information from the official source: Mairie d'Achères (19/10/2026)