Overview
VIONNAZ_TORGON is a secondary wastewater treatment plant in Torgon, Valais, Switzerland, serving 1,676 people with a designed capacity of 2,800 m³/day. It discharges treated effluent near the coast, reflecting its alpine-to-lake context.
VIONNAZ_TORGON is a municipal wastewater treatment plant located in Torgon, a village in the Valais/Wallis canton of Switzerland. The facility serves a population of 1,676 and is designed to handle a capacity of 2,800 m³ per day, placing it in the small agglomeration category under Swiss water protection regulations. The plant provides secondary treatment, which is the standard required by Swiss federal law for inland discharges into sensitive water bodies. Switzerland enforces strict effluent standards under the Waters Protection Act (GSchG), and plants of this scale typically employ biological treatment followed by clarification to meet limits on organic matter and nutrients. The treated wastewater is discharged into the local hydrological network, which ultimately drains into Lake Geneva (Lac Léman) via the Rhône River. This alpine watershed supports diverse aquatic life and is a critical resource for drinking water, recreation, and tourism in the region.
Environmental context
The plant discharges into a tributary of the Rhône River, which flows into Lake Geneva, one of the largest freshwater lakes in Western Europe. The lake supports a rich ecosystem including endemic fish species and serves as a major drinking water reservoir. The surrounding alpine environment is ecologically sensitive, with seasonal variations in flow and temperature that affect pollutant assimilation.
Frequently asked questions
VIONNAZ_TORGON is located in Torgon, a village in the municipality of Vionnaz, in the Valais/Wallis canton of Switzerland. The address is Sentier des Rails, Revereulaz, Torgon, Vionnaz, Monthey.
The plant serves a population of 1,676 people, making it a small agglomeration facility under Swiss water protection regulations.
The treated effluent is discharged into a local watercourse that flows into the Rhône River, which ultimately reaches Lake Geneva. The plant is within 10 km of the coast, indicating its proximity to the lake shoreline.
VIONNAZ_TORGON provides secondary treatment, which includes biological processes to reduce organic matter and suspended solids. This meets the standard required by Swiss law for discharges into sensitive water bodies.
The plant operates under the Swiss Waters Protection Act (GSchG), which mandates secondary treatment for agglomerations of this size. Discharge limits are enforced by cantonal authorities to protect the Rhône-Lake Geneva watershed.
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