Overview
EVIONNAZ wastewater treatment plant serves La Rasse, Evionnaz in Valais/Wallis, Switzerland. It serves a population of 3,988 and operates under Swiss water protection regulations.
The EVIONNAZ wastewater treatment plant is located in La Rasse, within the municipality of Evionnaz in the Valais/Wallis canton of Switzerland. Situated near the A9 motorway, this facility serves a population of approximately 3,988 residents, making it a small-scale municipal treatment plant in the Alpine region. As a Swiss wastewater treatment facility, EVIONNAZ operates under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates appropriate treatment standards for all agglomerations. For plants of this size, secondary treatment with nutrient removal is typically required to protect sensitive receiving waters in the mountainous terrain. The plant's treated effluent likely discharges into a local watercourse that feeds into the Rhône River, which flows through the Rhône Valley and ultimately into Lake Geneva (Lac Léman) and then the Mediterranean Sea. The Alpine watershed is ecologically sensitive, supporting diverse aquatic life and serving as an important corridor for migratory fish species.
Environmental context
The EVIONNAZ plant is located in the Rhône River basin, with treated effluent likely entering a tributary of the Rhône. The Rhône flows through the Valais region into Lake Geneva and then continues to the Mediterranean Sea. This Alpine watershed supports sensitive aquatic ecosystems, including cold-water fish species and diverse macroinvertebrate communities, requiring effective nutrient removal to prevent eutrophication.
Frequently asked questions
The EVIONNAZ plant is located in La Rasse, within the municipality of Evionnaz, in the Valais/Wallis canton of Switzerland, near the A9 motorway.
The plant serves approximately 3,988 residents, classifying it as a small agglomeration under Swiss water protection regulations.
Treated effluent from the plant is likely discharged into a local tributary of the Rhône River, which flows through the Rhône Valley into Lake Geneva and eventually the Mediterranean Sea.
The plant operates under the Swiss Water Protection Act (Gewässerschutzgesetz), which requires appropriate treatment levels for all agglomerations to protect water quality in sensitive Alpine watersheds.
For small agglomerations in Switzerland, secondary treatment with nutrient removal is typically required to meet strict effluent standards, especially in ecologically sensitive areas like the Rhône basin.
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