ALLAMAN Wastewater Treatment Plant, Allaman, Vaud, Switzerland

The ALLAMAN wastewater treatment plant serves the small community of Allaman in the canton of Vaud, Switzerland, located on the shores of Lake Geneva. With a population equivalent of 974, it is a small-scale facility that plays a key role in protecting the local aquatic environment. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive. Although Switzerland is not an EU member, its national regulations align with high standards for wastewater treatment, especially in sensitive areas like Lake Geneva. The plant has a designed capacity of 625 m³/day and currently treats an average of 442.12 m³/day, indicating it operates below its maximum capacity. Treated effluent from the plant is discharged into the vicinity of Lake Geneva, one of the largest freshwater lakes in Western Europe. The lake supports diverse aquatic life and is a vital drinking water source for the region. The plant's advanced treatment helps minimize nutrient loading and protects the lake's ecological health.

The plant discharges treated wastewater into the Lake Geneva basin, which drains via the Rhone River into the Mediterranean Sea. Lake Geneva is a large, deep lake that supports a diverse ecosystem, including fish species such as Arctic char and whitefish. The advanced treatment at ALLAMAN reduces phosphorus and nitrogen inputs, helping to prevent eutrophication and maintain water quality for downstream communities and habitats.