COLOMBIER SAUGNIEU Wastewater Treatment Plant, Tignieu-Jameyzieu, Auvergne-Rhône-Alpes

COLOMBIER SAUGNIEU is a wastewater treatment plant located in Tignieu-Jameyzieu, within the Isère department of the Auvergne-Rhône-Alpes region in France. The plant serves a small agglomeration of 1,307 people, reflecting its role in managing municipal wastewater for a rural or peri-urban community near Lyon. Its location along the Route de Lyon at Pont de Jameyzieu places it in proximity to the Bourbre River, a tributary of the Rhône. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 3,000 m³/day and an actual discharge volume of 233.17 m³/day, the facility operates well below its capacity, indicating potential for future growth or seasonal variability. As a French facility, it operates under national regulations transposing EU directives, with permits issued by the local water agency (Agence de l'Eau). The treated effluent is discharged into the local water system, ultimately draining into the Bourbre River and then the Rhône, one of Europe's major rivers. The Rhône basin supports diverse aquatic life and is an important ecological corridor. The plant's advanced treatment helps protect downstream water quality in this sensitive watershed, reducing nutrient loads and pollutants that could impact the Rhône's ecosystem and the Mediterranean Sea.

The plant discharges into the Bourbre River, a tributary of the Rhône River, which flows into the Mediterranean Sea. The Rhône basin is ecologically significant, supporting diverse fish species and migratory birds. Advanced treatment at this plant helps minimize nutrient pollution and protects downstream water quality in this important European watershed.