ASSISI_BASTIA Wastewater Treatment Plant, Bastia Umbra, Umbria, Italy

The ASSISI_BASTIA wastewater treatment plant is located in Bastia Umbra, in the Umbria region of central Italy. Serving a population equivalent of 51,066, the plant is part of the municipal infrastructure for the area, which includes the historic city of Assisi. The facility is situated inland, away from the coast, and its operations are governed by Italian regulations transposing the EU Urban Waste Water Treatment Directive (91/271/EEC). Under the EU UWWTD, agglomerations with a population equivalent between 10,000 and 150,000 are classified as medium agglomerations and are required to provide secondary treatment (biological treatment) as a minimum. For plants discharging into sensitive areas, more stringent tertiary treatment may be required. The regulatory framework ensures compliance with EU standards for nutrient removal and effluent quality. The treated effluent from the plant is discharged into the local water system, which ultimately drains into the Tiber River basin. The Tiber River flows through Umbria and Lazio before reaching the Tyrrhenian Sea near Rome. The plant plays a key role in protecting the water quality of the Tiber watershed, which supports diverse aquatic life and is used for irrigation and recreation downstream.

The ASSISI_BASTIA plant discharges into the Tiber River basin, which flows through central Italy and empties into the Tyrrhenian Sea. The Tiber watershed is ecologically significant, supporting fish species such as the Tiber barbel and providing habitat for migratory birds. The plant's location inland reduces direct marine impact, but its effluent quality is critical for maintaining the health of the river ecosystem, especially in the context of agricultural and urban uses downstream.