The drought persists in Seine-et-Marne. Despite cooler temperatures, the lack of rain continues to lower water levels in rivers. In a decree signed on September 25, 2026, the prefect of Seine-et-Marne maintains or reinforces vigilance and restriction measures across several sectors of the department.
Watercourses are classified into four levels: Vigilance (reduce consumption), Alert (limited uses), Enhanced Alert (more significant restrictions), and Crisis (maximum restrictions to preserve resources).
In Seine-et-Marne, the prefect has set the following levels: Crisis for the Fusain and Réveillon rivers; Enhanced Alert for the Grand Morin, Petit Morin, the Yerres, and the ru d’Ancoeur; Alert for the Thérouanne, the Yonne, and the Orvanne; and Vigilance for the Seine, Marne, Essonne, Loing, Lunain, and Nonette rivers.
It is important to note that the level assigned to a watercourse does not automatically mean the same restrictions apply to all residents in the area. Rules depend on the water source (drinking water, groundwater, river water) and the intended use. To find out the precise restrictions for your home (e.g., watering gardens, filling pools, washing cars), it is recommended to consult the government website VigiEau.
The prefecture urges residents to continue simple water-saving practices, such as avoiding waste and limiting unnecessary consumption, as reservoir lakes are currently filled between 40 and 50%. The situation may evolve in the coming weeks depending on rainfall.
