Le Lieu Wastewater Treatment Plant, Vaud, Switzerland

Le Lieu wastewater treatment plant is located in the municipality of Le Lieu, within the district of Jura-Nord vaudois in the canton of Vaud, Switzerland. This facility serves a small population of 1,464 residents, reflecting its role in a rural alpine community. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required under Swiss water protection legislation. With a designed capacity of 1,063 m³/day and an average discharge volume of 664.54 m³/day, the plant operates well within its capacity, ensuring effective treatment of local wastewater. The treated effluent is discharged into the local watershed, which ultimately drains into the Orbe River and then into the Rhone basin. This region is ecologically sensitive, supporting diverse aquatic life and contributing to the overall health of the Rhone River system, which flows into Lake Geneva and eventually the Mediterranean Sea.

The plant discharges into the local watershed that feeds the Orbe River, a tributary of the Rhone. The Rhone flows through Lake Geneva and continues to the Mediterranean Sea. This alpine region supports diverse aquatic ecosystems, including fish species such as brown trout, and the water quality is critical for maintaining biodiversity in the downstream river systems.