DEPURATORE CROCETTA Wastewater Treatment Plant, Vetralla, Lazio, Italy

DEPURATORE CROCETTA is a municipal wastewater treatment plant located in Vetralla, a town in the Lazio region of central Italy. The plant serves a population of approximately 4,000 residents and has a designed capacity of 4,000 cubic meters per day, with a reported discharge volume of 791.86 cubic meters per day. 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. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The plant operates under Italy's national implementation of the directive, overseen by regional environmental authorities. The treated effluent is discharged into local watercourses that drain into the Tiber River basin, ultimately reaching the Tyrrhenian Sea. The plant plays a key role in protecting the region's water quality, supporting both ecological health and downstream uses such as agriculture and recreation.

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. The advanced treatment helps reduce nutrient loads that could otherwise contribute to eutrophication in the coastal marine environment.