The month of September, continuing the summer trend, was marked by a very significant rainfall deficit. Precipitation was almost absent, temperatures exceeded seasonal norms, and soil moisture remains very low. Consequently, the flow rates of the lower Arve have reached particularly low levels, with no significant improvement expected in the coming weeks.
Faced with this situation, the Prefecture of Haute-Savoie has activated crisis level 4 out of 4 for the lower Arve sector. These restriction measures are applicable until October 31, 2026.
At this crisis level, only priority water uses are authorized, notably those necessary for the population's drinking water supply, the survival of aquatic species, animal watering, civil security, public sanitation, and certain agricultural uses. These measures aim to preserve water resources in a context of particularly severe drought.
Residents are invited to strictly adhere to the current restrictions and limit their water consumption to essential uses. The City thanks the public for their vigilance and commitment.
The detailed prohibitions and restrictions can be consulted in prefectural order no. DDT-2026-1171 dated September 30, 2026.
