Les Trois Ponts Les Grands Menus Wastewater Treatment Plant, Andrézieux-Bouthéon

The Les Trois Ponts Les Grands Menus wastewater treatment plant is located in Andrézieux-Bouthéon, a commune in the Loire department of the Auvergne-Rhône-Alpes region, France. The plant serves a population of approximately 34,133, placing it in the medium agglomeration category under the EU Urban Waste Water Treatment Directive (UWWTD). As a French wastewater facility serving a population between 10,000 and 100,000, the plant is required to meet secondary treatment standards under the UWWTD. The directive mandates that all agglomerations of this scale must have collecting systems and appropriate treatment to protect the receiving environment. It operates within France's regulatory framework, which implements the UWWTD through national legislation. The plant discharges treated wastewater into the local watershed, which ultimately drains into the Loire River, one of France's major rivers. The Loire flows north and west through central France before emptying into the Atlantic Ocean. The plant plays a key role in protecting the Loire basin's water quality, supporting aquatic ecosystems and downstream communities.

The plant's treated effluent enters the Loire River basin, which flows through the Auvergne-Rhône-Alpes region before joining the main Loire River. The Loire is a vital waterway supporting diverse aquatic life, including migratory fish species. The plant's operations help maintain water quality in this ecologically sensitive river system, which ultimately drains into the Bay of Biscay on the Atlantic coast.