Depuratore San Martino al Cimino: Advanced Wastewater Treatment in Viterbo, Lazio

Depuratore San Martino al Cimino is an advanced wastewater treatment plant located in Viterbo, Lazio, Italy. The facility serves a population of approximately 4,000 people, treating domestic wastewater from the local community. It is situated inland, more than 10 km from the coast, and operates under Italian regulations that transpose the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU directive for agglomerations of this size. With a designed capacity of 4,000 m³/day and an actual discharge volume of 791.86 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The facility is part of the municipal wastewater infrastructure managed by local authorities. The treated effluent is discharged into the local watershed, which ultimately drains into the Tyrrhenian Sea via the Tiber River basin. The plant plays a key role in protecting the water quality of the Tiber River and its tributaries, supporting aquatic life and downstream ecosystems. Its advanced treatment level helps minimize nutrient loading and other pollutants, contributing to the ecological health of the region.

The plant discharges into the Tiber River basin, which flows through central Italy and empties into the Tyrrhenian Sea near Rome. The Tiber supports diverse aquatic life and is an important migratory corridor for fish species. Advanced treatment at this plant reduces nutrient and pollutant loads, helping to protect downstream water quality and the sensitive coastal environment of the Tyrrhenian Sea.