Mont Jovet Oley Wastewater Treatment Plant, Montjovet, Valle d'Aosta

Mont Jovet Oley is a wastewater treatment plant located in Oley, Montjovet, within the Valle d'Aosta region of Italy. The plant serves a population of approximately 1,800 residents, providing secondary treatment to municipal wastewater. It is situated in an alpine valley, reflecting the mountainous terrain of the region. The plant has a designed capacity of 4,000 m³/day and currently discharges 356.34 m³/day of treated effluent. As a secondary treatment facility, it meets the standard requirements for organic matter and suspended solids removal. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants serving agglomerations between 2,000 and 10,000 population equivalent are required to provide secondary treatment, and this plant's scale aligns with that regulatory framework. The treated effluent is discharged into the local watershed, which ultimately drains into the Dora Baltea River, a tributary of the Po River. The Po River flows eastward across northern Italy into the Adriatic Sea. The plant plays a key role in protecting the alpine streams and downstream water quality in the Po basin.

The plant discharges into the Dora Baltea River, which flows through the Aosta Valley and joins the Po River near Turin. The Po River is the longest river in Italy and drains into the Adriatic Sea, supporting a diverse aquatic ecosystem. The alpine watershed is sensitive to nutrient loading, and secondary treatment helps reduce organic pollution, safeguarding downstream habitats and water quality for both ecological and human uses.