DARDAGNYFIRMENICH1 Wastewater Treatment Plant, La Plaine, Geneva, Switzerland

DARDAGNYFIRMENICH1 is a wastewater treatment plant located in La Plaine, within the municipality of Dardagny, in the canton of Geneva, Switzerland. The plant serves a population of around 14,439, placing it in the medium agglomeration category under Swiss and EU regulatory frameworks. Its proximity to the coast (within 10 km) suggests that treated effluent may discharge into a water body connected to Lake Geneva or the Rhone River system, which ultimately flows to the Mediterranean Sea. Under the EU Urban Waste Water Treatment Directive (UWWTD), which Switzerland aligns with through bilateral agreements, agglomerations of this size are generally required to provide secondary treatment. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day), indicating a moderate scale. Swiss regulations, enforced by cantonal authorities, mandate compliance with strict effluent standards to protect sensitive water bodies. The plant's environmental significance lies in its location within the Rhone basin, which drains into Lake Geneva and then the Rhone River. The Rhone is a major European river supporting diverse aquatic ecosystems and providing water for agriculture and drinking. Discharge from the plant must meet stringent Swiss standards to prevent nutrient loading and protect downstream habitats, including the UNESCO-listed Lake Geneva region and the Rhone delta.

The plant is situated in the Rhone River basin, which drains into Lake Geneva (Lac Léman) and then continues as the Rhone River to the Mediterranean Sea. This watershed supports diverse aquatic life, including fish species like trout and pike, and is an important migratory corridor for birds. The proximity to the coast (within 10 km) means treated effluent may enter a tributary that flows into the Rhone, requiring careful management to prevent eutrophication and protect downstream ecosystems.