HENNIEZ Wastewater Treatment Plant, Henniez, Vaud, Switzerland

The HENNIEZ wastewater treatment plant is located in Henniez, a municipality in the District de la Broye-Vully, Vaud, Switzerland. The plant serves a population of approximately 8,106 residents, classifying it as a small to medium agglomeration under Swiss wastewater management standards. As a Swiss facility, the plant operates under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates appropriate treatment levels based on the sensitivity of the receiving water body. For agglomerations of this size, secondary treatment with nutrient removal is typically required to protect water quality. The treated effluent from the plant is discharged into local watercourses that ultimately drain into the Broye River, a tributary of the Aare River, which flows into the Rhine River and eventually the North Sea. The plant plays a key role in protecting the aquatic ecosystems of the Broye Valley and downstream waters.

The HENNIEZ plant discharges into local streams that feed the Broye River, part of the Rhine basin. The Broye River supports diverse aquatic life and is an important corridor for fish migration. Downstream, the Rhine is a major European waterway with significant ecological and economic importance. Protecting water quality in this watershed helps preserve habitats for species such as the European eel and various salmonids.