RIDDES Wastewater Treatment Plant, Riddes, Valais, Switzerland

RIDDES is a wastewater treatment plant located in Riddes, a municipality in the canton of Valais, Switzerland. The plant serves a population of approximately 5,560 residents, making it a small-scale facility within the Swiss wastewater infrastructure. It is situated in the Rhône valley, an alpine region known for its mountainous terrain and proximity to the Rhône River. As a Swiss plant, RIDDES operates under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates appropriate treatment levels based on the sensitivity of the receiving water body. For small agglomerations like Riddes, secondary treatment is typically required to reduce organic pollutants and nutrients. The plant's designed capacity of 1.00 (likely in thousands of cubic meters per day) aligns with its population served. The treated effluent from RIDDES is discharged into the local water system, which ultimately drains into the Rhône River. The Rhône flows through the Valais region and into Lake Geneva (Lac Léman), a large alpine lake that supports diverse aquatic life and is an important ecological and recreational resource. The plant plays a key role in protecting the water quality of the Rhône and Lake Geneva from nutrient pollution and pathogens.

The RIDDES plant discharges into the local drainage network that feeds the Rhône River, which flows through the Valais valley and into Lake Geneva. The Rhône is a major alpine river that supports diverse aquatic ecosystems, including fish species such as brown trout and grayling. Lake Geneva is a large, deep lake that provides drinking water and supports tourism. Protecting water quality in this watershed is critical to prevent eutrophication and maintain ecological balance.